If a zebra mussel is discovered in a lake in Pennsylvania, then the ecologist would be worried because it is an invasive species. The zebra mussel is native to Ukraine and Russia, but if it has been found in Pennsylvania, than it means that it has been introduced in this area. As an invasive species, the zebra mussel can be very dangerous for the native species in the lake. The invasive species usually are more competitive for food sources than the native species, manage to reproduce quicker, bring in diseases, and the native species tend to not have defense mechanisms for them. This leads to rapid decline or even extinction in the native species, while the invasive spreads out quickly and takes over, resulting in dramatic change in the whole ecosystem.
When one DNA molecule is copied to make two DNA molecules, the new DNA
contains
A) 25% of the parent DNA.
B) 50% of the parent DNA.
C) 75% of the parent DNA.
D) 100% of the parent DNA.
E) none of the parent DNA.
what is required in the genotype of an individual to show a recessive trait?
A.two recessive alleles
B.at least one recessive allele
C.no recessive alleles
Answer:
A. Two recessive alleles
Explanation:
A dominant trait is like a school bully it knocks back the recessive trait (Bb) to where it can not be seen so the spotlight is all on the dominant trait however if there are two recessive traits (bb) they can be seen because the bully is not around to push them back.
Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. Instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. Does this process require energy from the cell? This is an example of what type of molecular movement?
Answer: this is called passive transport and it does not require energy.
which of the individuals below would express a recessive trait?
A.Bb
B.BB
C.bb
C. bb
They have two recessive genes and therefore will be expressed.
Even though Bb has one recessive gene it will not show because the dominate overtakes the recessive. They are a carrier of the recessive gene though.
Hope this helped!
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The intervention of extraterrestrials has been used to explain the Bermuda Triangle, a region of the Atlantic Ocean where ships and planes are frequently lost, leaving no evidence behind. How would this explanation best be characterized?
Final answer:
The explanation of extraterrestrial intervention in the Bermuda Triangle can best be characterized as a conspiracy theory. Claims of UFO sightings can usually be explained as natural phenomena, human craft, or hoaxes. It is important to approach these theories with skepticism and rely on evidence-based explanations.
Explanation:
The explanation of extraterrestrial intervention in the Bermuda Triangle can best be characterized as a conspiracy theory.
Although there have been numerous stories and video evidence of strange objects in the sky, there is no scientific evidence or peer-reviewed accounts of extraterrestrial life forms visiting Earth. Claims of UFO sightings can usually be explained as natural phenomena, human craft, or hoaxes.
It is important to approach these theories with skepticism and rely on evidence-based explanations.
A chemical reaction between iron atoms and oxygen molecules can only occur if
Answer:
Here is the full statement: A chemical reaction between iron atoms and oxygen molecules can only occur IF THERE ARE EFFECTIVE COLLISIONS BETWEEN THE PARTICLES OF THE TWO ELEMENTS.
Explanation:
Chemical reaction involves the re-arrangement of the particles that are present in the reacting substances. During the course of reaction, the particles of reactant are broken down and rearrange to form the products. For a chemical reaction to occur, the particles of reactants must be broken down and they must undergo effective collision. Effective collision between the atoms of iron and oxygen will give rise to the product, which is hydrated iron (lll) oxide. Without collision, chemical reaction will not occur and the product will not be formed.
Why are well-defined reading frames critical in protein synthesis? A. Without a well-defined reading frame, the mRNA would be transcribed back into DNA. B. Without a well-defined reading frame, the ribosome is unable to bind to the mRNA. C. Without a well-defined reading frame, the peptide made from a given sequence could be completely different. D. Without a well-defined reading frame, the resulting protein would be transported to the cell surface.
Answer:
C
Explanation:
During the translation of an mRNA, it is read in a sequence of three nucleotides called codons. Therefore, a single strand of DNA or RNA will have three reading frames. Only one is biologically relevant and is referred to as the open reading frame because it is translated to the ideal protein. A shift in the reading of the frame can result in a wrong peptide.
What molecule does dna store the instructions for building
Answer: A gene
I'm pretty sure it's a gene because it's literally the instructions as to how the make up if a certain person would be.
DNA stores instructions for building proteins.
Explanation:The molecule that DNA stores instructions for building is called protein.
Proteins are large, complex molecules composed of amino acids. They play a crucial role in the structure, function, and regulation of cells and tissues. DNA carries the genetic code that determines the sequence of amino acids in a protein, and this information is used by cells to assemble a specific protein.
For example, the DNA instructions might code for a protein involved in muscle contraction, such as actin. Actin is a protein that forms the framework of muscle fibers, allowing them to contract and generate movement.
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There are many proposed solutions to traffic congestion in metropolitan areas. One solution has been prove ineffective: in fact, it promotes more cars and drivers on the roads. Which solution is it?
A) Automate the driving process itself.
B) Build more infrastructure including more roads, tolls, and car-pooling lanes.
C) Using wireless vehicle-to-vehicle communication, cars could talk to each other in an attempt to keep traffic flowing more smoothly.
D) A smartphone app that works like a social network for drivers, combining online maps with updates from other drivers about traffic jams, road works and accidents.
Answer:
B
Explanation
because its the correct answer and yeah i mean its obvious
Answer:
Option B, Build more infrastructure including more roads, tolls, and car-pooling lanes.
Explanation:
When an infrastructure is built it allows more vehicle to go through it. It proves to be useful only for some time just after the construction. However, in long run it again proves to be inefficient as efficient traffic management require efficient traffic planning and not construction of more infrastructure.
Also addition of infrastructure, increases the vehicular population thereby adding more vehicles to already existing mismanaged traffic.
Hence, option B is the right answer
Name the Organism interaction and relationships that we often see in living organisms
One of the major complications of diabetes is delayed wound healing. People with diabetes also often experience neuropathy—numbness or loss of sensation on the extremities—especially the feet. What medical complications can arise from slow wound healing and neuropathy of the feet?
Explanation:
Slow healing : pathogens can enter the open wound and cause infections, worsening the wounds. If the problem continues, parts of body will require removal(cutting off).
Neuropathy: as the sensations are loss, receptors no longer react to contact stimuli & reflexes can't be conducted on time for survival pruposes. For example, if the skin touches a hot object, the receptors on skin will not react to the heat & remove itself away from the stimuli.
One of the major complications of diabetes is delayed wound healing. People with diabetes also often experience neuropathy—numbness or loss of sensation on the extremities—especially the feet. The slow wound healing can cause infection and neuropathy can cause complete loss of feeling.
What are peripheral neuropathy and infection?Peripheral neuropathy is one of the common causes of diabetes. It is the result of damage to peripheral nerves which leads to numbness, pain, and weakness in hands and legs.
Wounds that are not healing or wounds that are very slow healing are caused majorly by diabetes because they have a problem with the activation of the immune system.
If the immune system cannot function in the right way, then wound healing can take more time and are at high risk for infection.Peripheral neuropathy also known as diabetic neuropathy on the other hand is another severe issue a diabetic person can experience.Peripheral neuropathy can ultimately cause no feeling in hands and legs that can make them paralyzed at some point of their lifetime.To learn more about diabetes, refer:
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Susan is planting her garden and choosing plants at the local plant nursery. She tells the clerk that she wants to plant perennials in her front garden bed. How often is Susan expecting the plants that she chooses to germinate and flower? A. Grow into larger, permanent trees and shrubs
B. Sprout every year for two years
C. Sprout every year, year after year
D. Sprout this year and need to be replanted
Answer:
c)Sprout every year, year after year
Explanation:
A perennial plant or simply perennial is a plant that lives more than two years. Some sources cite perennial plants being plants that live more than three years. The term is often used to differentiate a plant from shorter-lived annuals and biennials.
Answer:
Option C
Explanation:
Perennial means something that is not permanent or it comes after an interval.
Perennial plants are the plants that sprout every year which means they grow and survive for one year and then they die. The next year they sprout again from the seeds that were produced the last year and were able to germinate.
Some common example of perennial plants are -
Hibiscus, Lilies, Daisies, Lavender, Rose Bushes etc.
if i explore two oceanic plates at a convergent boundary , i will observe :
A. faults
B. ocean formation
C. island chains
D. seafloor spreading
Answer:
D. seafloor spreading
Explanation:
If you explore two oceanic plates at a convergent boundary , you will observe seafloor spreading.
Answer:
Option C, island chains
Explanation:
In convergence of two geographical boundaries, one slips (sub ducts) below the other while moving towards each other. This leads to formation of subduction zone. In the subduction process, when two oceanic plate converge, volcanic islands are formed. These volcanic islands are formed in a linear chain format and hence are known as volcanic arc for example Marians, Aleutians, etc.
Hence, option C is correct
what do we call a specific variant of a character?
A.gene
B.trait
C.locus
Answer:
Trait
Explanation:
We call a specific variant of a character a phenotypic trait.
if T=tall and t=short what will be the physical appearance of the offspring the cross below?
A.some will be tall and some will be short
B.they will all be tall
C.they will all be short
D.they will be medium height
What is the term for any bipedal primate?
A. Human
O
O
B. Hominid
O
C. Homo sapien
O
D. Neanderthal
Answer:
B. Hominid
Explanation:
hominid refers to a family of primate
bipedal refers to using both legs for walking
The term for any bipedal primate is "hominid," which is in Option B as the hominids are a family of primates that includes all bipedal species of the human lineage, as well as their extinct ancestors and relatives.
What is a hominid?The term "hominid" refers to any member of the family Hominidae, which includes all species of bipedal primates that are related to modern humans, as well as their extinct ancestors and relatives. The Hominidae family is a subgroup of the larger group of primates known as hominoids. Hominids are characterized by their bipedalism, which means that they walk on two legs, and this is a unique characteristic that sets them apart from other primates. Walking on two legs freed their hands for other tasks, such as toolmaking, carrying objects, or caring for their young.
Hence, the term for any bipedal primate is "hominid," which is in Option B.
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When using food additives in food to help extend its shelf life an operation must first?
Bodies of interplanetary debris that orbit the Sun with most in the area between Mars and Jupiter are called ____.
Question 3 options:
meteors
comets
asteroids
meteorites
Answer:
Bodies of interplanetary debris that orbit the Sun with most in the area between Mars and Jupiter are called comets.
Answer: Option (3)
Explanation: The region between the inner planets and the outer planets, i.e between Mars and Jupiter, there lies a belt known as the asteroid belt. These asteroids ranges in size from a few meters to hundreds of km. The asteroids in this belt, generally moves at a speed of about 80,000 km/hr and there occurs frequent collision between them.
Thus, the correct answer is option (3).
Osmosis (pick the incorrect statement) Osmosis is the passive transport of water from an area of low solute concentration to an area of high solute concentration. The movement of water across a cell membrane requires transmembrane integral proteins. The osmotic pressure between two compartments is determined by the relative concentrations of the permeant solutes in the compartments. Cells regulate water and ion balance by actively transporting ions but not water.
Answer:
Cells regulate water and ion balance by actively transporting ions but not water.
Explanation:
Cells regulate water and ion balance by transporting the water molecules from a region of of high concentration to a region of low concentration passively. Active transport does not maintain the water and ion balance, so the last statement is incorrect.
Rest of the statements are correct.
In the first statement they are saying that in osmosis water from an area of low solute concentration moves towards an area of high solute concentration which is absolutely right. An area which has a low solute concentration has a high solvent concentration and vice versa. In osmosis, only solvent can move because osmosis occurs by means of a semi permeable membrane which does not let a solute molecule to pass by. So the area where solute is less, solvent is more and this solvent tends to move towards an area which has high solute concentration because a high solute concentration will have low solvent concentration .
Second statement is also correct. water cannot cross cell membrane because water is polar while cell membrane is non polar. Non polar cell membrane does not let water to pass through it because water is polar therefore water requires integral proteins named as aquaporins to cross cell membrane.
Statement third is also correct. The osmotic pressure is a measure of solute concentration of a particular compartment. The less is the solute in a compartment, the more will be the osmotic pressure. That simply means that osmotic pressure of a pure solvent will be highest because it does not have solute at all. In contrast to this, a solution will have comparatively low osmotic pressure because of the presence of solute in it.
The incorrect statement about osmosis is that water movement across a cell membrane requires transmembrane integral proteins. In reality, water can pass through the cell membrane via osmosis without the need for proteins. Osmosis maintains solute equilibrium on both sides of the membrane.
Explanation:The incorrect statement in your options about osmosis is that: The movement of water across a cell membrane requires transmembrane integral proteins. In truth, water can pass through the cell membrane via a process called osmosis without the need for proteins. Osmosis is the passive transport of water molecules from an area of low solute concentration to an area of high solute concentration. The aim is to maintain equilibrium in the solute concentration on both sides of the membrane. The osmotic pressure difference between two compartments is created by the relative concentrations of solutes that can pass through the membrane, known as permeant solutes. Cells do actively regulate ion balance and water via different mechanisms, not just by transporting ions.
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Which feature allows rockweed to withstand the constant wave action of its environment?
During an experiment, which factors are observed and measured?
a. hypotheses
b. independent variables
c. dependent variables
d. constants
The dependent variables are factors that you want to observe or measure. The hypothesis is an explanation made on the basis of limited evidence as a starting point for further investigation. The constants are exactly what they sound like, it is stuff that does not change during the experiment. The independent variables is stuff that reacts to the dependent variables. This means the answer will be C.
A particular triplet of bases in the template strand of dna is 5′-agt-3′. What would be the corresponding codon for the mrna that is transcribed? A. 3 UCA 5 B. 3 UGA 5. C. 5 TCA 3 D. 3 ACU 5
Answer:
3 UCA 5
Explanation:
The 5' end of a strand pairs up with the 3' of its complimentary strand. So with this fact, we can rule out option C.
Now when you pair the DNA template with the mRNA template, remember that RNA contains uracil and not thymine. So the base pairings would be:
T = A
A = U
U = A
G = C
C = G
Based on this, the pairing would be like this:
5' A G T 3'
3' U C A 5'
The corresponding mRNA codon to the DNA triplet 5'-AGT-3' is 5'-UCA-3', which is option A. 3' UCA 5'.
Explanation:When transcribing DNA to mRNA, the bases are matched in the following way: adenine (A) pairs with uracil (U), thymine (T) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) pairs with cytosine (C). Therefore, for the DNA triplet 5'-AGT-3', the corresponding mRNA codon would be the complement of this sequence, transcribed in the antiparallel direction, which is 5'-UCA-3'. So, the correct answer is A. 3' UCA 5'.
What happens to the total population when the birth rate is at 40 and the death rate is at 15?
A. The population is decreasing significantly.
B. The population is moderately decreasing.
C. The population is increasing significantly.
D. The population is moderately increasing.
Answer: c. The population is increasing significantly
Explanation: The birth rate is the amount of live births per 1,000 people in a year or period. The death rate is the amount of deaths per 1,000 people in a population in a year. If we substract the death rate (15) from the birth rate (40) we obtain the rate of natural increase. The rate of natural increase in the example is 25 what neans that the population is increasing significantly.
Answer:
C
Explanation:
Which pair of chromosomes determines sex in humans?
A.15th
B.1st
C.23rd
what is true of the supply of petroleum on the earth today
A. It is a limited supply
B. It forms as quickly as we use it
C. It is being replenished at a rapid rate
D. It is in constant supply
Answer:
A. It is a limited supply
Explanation:
Petroleum is one of the fossil fuels that originates from dead and decaying organisms in basins of deposition. For petroleum to form, several geologic,biologic and chemical factors must be accurately in place. These factors takes a huge amount of time in geologic time scale to form. The petroleum in the crust today formed several millions of years ago.
With this knowledge, petroleum is a non-renewable resource. It was central to the industrial revolution and the modern world was built around the oil industry. Exploration and production of petroleum provides oil for industrial and domestic use. Formation of petroleum takes millions of years and so, it is not renewable in our life time. It would take several years for the oil being used today to be replenished provided all the factors are in play.
This makes oil a limited resource constantly being depleted and not easily replenished.
Organisations like OPEC(Organisation of Petroleum Exporting Countries) comes together to ration production and supply so as to keep oil consumption in check.
Answer:
A. It is a limited supply
Explanation:
Imagine that you are walking through a forest on a chilly day, and you can clearly hear the fallen leaves crunch underfoot. this forest would be located __________.
Answer: This forest would be located in somewhere like rio
Explanation:
Which structure is found in the cytoplasm of a prokaryotic cell
What did Mendel's experiments with pea plants show?
A. How traits are passed between generations
B. How the plants produce their seeds
C. How the plants produce their offspring
D. How traits can be acquired in organisms
Answer:
Mendel's experiments showed How traits are passed between generations
Did you know:
Mendel is often considered the Father of Genetics
because of his experiments with pea plants.
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Which of the following best describes a viral infection, such as the common cold?
A. Virus grow and develop in the body.
B. Virus are living organisms.
C. Viruses require host cells in the body.
D. Viruses can be treated with antibiotics.
Answer:
C. Viruses require host cells in the body.
Explanation:
Answer: C. Viruses require host cells in the body
Explanation:
I think I know it's the last 2 answers I just want to know am I right or am I missing an answer?
Which statements correspond correctly to sexual reproduction?
the potential combinations are unlimited
variations have no boundaries
new genetic information is originated at fertilization
variations remain within created kinds
all genetic information comes from preexisting genes
Final answer:
The correct statements relating to sexual reproduction are that the potential combinations are indeed unlimited, variations have no boundaries, and although new genetic combinations arise, all genetic information derives from preexisting genes, and variations remain within created kinds.
Explanation:
In sexual reproduction, the combination of genetic material from two parents leads to offspring that have unique genetic makeups. The processes that contribute to this diversity include crossing-over during meiosis, independent assortment of chromosomes, and the random union of gametes at fertilization. As a result, sexual reproduction has the potential to produce a vast array of genetic combinations.
Regarding the given statements, we can say that the following are correct:
The potential combinations in sexual reproduction are indeed unlimited.Variations indeed have no boundaries due to the random nature of genetic recombination and gamete fusion.While new genetic information is not exactly originated at fertilization, the unique combination of existing genetic information from two parents does create a new genotype.Variations do remain within created kinds, meaning species tend to produce offspring within the same species.All genetic information indeed comes from preexisting genes; the combination of these genes, however, results in unique individuals.