Asexual reproduction has low genetic variability. Where does the variation in offspring come from? A) Random fertilization of gametes B) Crossing over events during mitosis C) Genetic mutations and replication errors D)Arrangements of chromosomes in metaphase I
Answer:
C) Genetic mutations and replication errors
Explanation:
Variations in the progeny produced by asexual reproduction come from mutations and errors during DNA replication. Mutations are the sudden random changes in the genome that add variations. Replication is the process of DNA synthesis; any error during DNA replication leads to genetic variations in the progeny.
Since asexual reproduction does not include fusion of gametes, fertilization can not add variations to the progeny produced by asexual reproduction.
Which molecular property defines the location of electrons?
A) Reactivity
B) Resonance
C) Acidity
Thank You (:
Answer: Reactivity
Explanation:
The location of electrons in an atom defines the reactivity of the atom. The number of electrons that is found in the outermost shell defines its reactivity.
The tendency of an atom to take part in a chemical reaction is defined as reactivity.
Noble gases have low reactivity because they have valence electrons in the outermost shell.
The atoms that have not completed their octet are not stable and have high reactivity. Example: chlorine , fluorine
what happen to stomatal aperture width as co2 levels increased
Answer:
The stomatal aperture width closes once the concentration inside the leaves is normal. More amount of carbon dioxide is not required for the plant cell.
The stomatal aperture is there to maintain the level of oxygen and carbon dioxide in the plant cell. The stomatal aperture opens to intake carbon dioxide and move oxygen out of the cell.
But once the carbon dioxide concentration is optimum this width closes and then no more carbon dioxide is inhaled inside the plant cell.
How many different types of ribosomes are found in a plant cell?
Final answer:
In a plant cell, there are two main categories of ribosomes: free ribosomes in the cytoplasm and membrane-bound ribosomes attached to the rough ER. Plant cells also contain unique ribosomes in the mitochondria and chloroplasts, and all these ribosomes originate from the nucleolus.
Explanation:
Types of Ribosomes in a Plant Cell:
In a plant cell, there are multiple types of ribosomes that play a crucial role in protein synthesis. The two main categories based on their cellular location are free ribosomes, dispersed within the cytoplasm, and membrane-bound ribosomes, attached to the rough endoplasmic reticulum (ER). Apart from these, plant cells have special ribosomes within their mitochondria and chloroplasts, which resemble those found in prokaryotes. The ribosomes in the cytoplasm consist of four types of rRNA in eukaryotes: the 18S rRNA in the small subunit, and the large subunit containing the 5S, 5.8S, and 25S rRNAs in plants.
These organelle-specific ribosomes (in mitochondria and chloroplasts) differ from the cytoplasmic ribosomes and are unique to the plant cell’s photosynthetic and energy conversion machinery. Additionally, the eukaryotic ribosomes within the nucleus originate from the nucleolus, which is specialized for the synthesis and assembly of rRNAs.
The color of a mineral in powdered form is termed _____.
John dalton's ideas about atoms were similar to those of __________.
John Dalton's ideas about atoms were similar to those of Democritus.
Who was Democritus?Democritus was a pre-Socratic Greek philosopher from Abdera who is most known for developing the atomic theory of the universe. All of his works have been lost.
Democritus, one of the two founders of ancient atomist theory, was known in antiquity as the "laughing philosopher" due to his focus on the need of "cheerfulness."
He developed a framework that his instructor Leucippus had created into a materialist explanation of the universe.
Democritus relied his theory on his observations rather than doing any experiments to determine whether it was accurate. Democritus, in contrast to modern scientists, had no conclusive evidence to back up his theory.
Thus, John Dalton's theories on atoms were comparable to Democritus'.
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what is the surface area to volume ratio of a cell that is 100 micrometers on one side? Is this ratio good for a cell or not? Why?
Final answer:
The surface area to volume ratio for a cell with 100 micrometer sides is 0.06, which is considered low and not conducive to efficient exchange of materials with the environment, potentially impairing cell function due to insufficient nutrient supply and waste removal.
Explanation:
The surface area to volume ratio of a cell that is 100 micrometers on one side can be calculated by first finding the surface area (SA) and the volume (V). The surface area is SA = 6 × (side length)² and the volume is V = (side length)³. Since the side length is given as 100 micrometers, the surface area is 6 × (100 µm)² = 60,000 µm² and the volume is (100 µm)³ = 1,000,000 µm³. Thus, the surface area to volume ratio is 60,000 µm² / 1,000,000 µm³ = 0.06. This ratio means that the cell has 0.06 square micrometers of surface area per cubic micrometer of volume.
In terms of cell biology, a higher surface area to volume ratio is typically considered better because it allows for more efficient diffusion of substances in and out of the cell. The calculated ratio of 0.06 is relatively low, suggesting that if a real cell had this ratio, it may not be able to efficiently exchange materials with its environment. Consequently, such a low ratio could impair cell function, as the cell would have difficulty supplying enough nutrients and expelling waste quickly enough for its large volume.
What best explains the relationship between structure and function of the cell membrane?
The single layer membrane surrounding the outside of the cell allows for the easy removal of waste.
The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell.
The fluid inside the membrane buffers the chemical reactions taking place inside the cell.
The lipids forming the membrane provide energy for protein synthesis.
Answer:
The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell.
Explanation:
The cell membrane is a biological membrane that separates the interior of cells from the environment outside of it. This protects the cell from the environment outside of it. It also plays an important role in what gets in and out of the cell. As the membrane is made up of lipids and proteins, it is able to control the movement of substances in and out of cells and organelles.
What is the function of proteins and carbohydrates that are embedded in a cell membrane?
1.They help control what enters and leaves the cell.
2.They direct the reproduction process for the cell.
3.They act as storage molecules for water.
Answer : The correct answer is -
1.They help control what enters and leaves the cell.
Some molecules can not cross the lipid bilayer membrane (cell membrane) of cells (such as large polar molecules and hydrophilic molecules).
There are special carbohydrate and protein that are embedded in the membrane and act like Transmembrane channels or transporters, which assist in the trasport of such molecules (like amino acids and proteins) on both sides across the cell.
Thus, option 1) is the right answer.
Many plants that grow in tropical rain forests have specialized roots that anchor them to the branches and trunks of trees. They do not harm the trees. These plants get food and water from various sources, including the air and dead organic matter found on the trees.One example of these plants found in tropical rain forests is the bromeliad. Its leaves form a cup-like structure that is able to hold water. This water provides a feeding and breeding area for many insects and frogs. Snakes and lizards also come to these plants in search of food and water. A cross-section showing the inside of a bromeliad is shown below. Which of these types of organisms break down dead organic matter in the rain forest?
Answer:
Decomposes
Explanation:
Decomposing organisms are those that draw energy from decomposing organic matter. They are in the group of fungi, bacteria and protozoa. The importance of decomposers for the balance of the ecosystem is enormous, since they guarantee the recycling of decomposed materials and generate nutrients for the maintenance of the ecosystem.
What does the mass of an object depend on? Force of gravity Temperature of the object Time taken for an event to occur Amount of matter that makes up the object
The amount of matter that makes up an object.
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True or false: a neuron can release more than one kind of neurotransmitter.
a. True
b. False
Which could be a reason viruses are considered nonliving things?
The nurse understands that clients with emphysema experience which pathophysiologic change in the alveolar sacs?
_______________, also known as aerobic respiration, is one process by which cells transfer the energy in glucose to the energy in atp. question 2 options: cellular respiration fermentation glycolysis
Calcium storage, lipid synthesis, carbohydrate metabolism, and detoxification of harmful substances, all occur in the ______ .
The smooth endoplasmic reticulum (SER) is the cellular organelle responsible for calcium storage, lipid and steroid hormone synthesis, carbohydrate metabolism, and the detoxification of harmful substances.
Explanation:Calcium storage, lipid synthesis, carbohydrate metabolism, and detoxification of harmful substances all occur in the smooth endoplasmic reticulum (SER). The SER is a critical organelle in cells, especially prominent in those that synthesize large amounts of lipids and steroid hormones, such as the cells of the ovaries and testes, the liver, and certain cells within the nervous system.
The SER serves several vital functions, including the synthesis of carbohydrates, lipids, and steroid hormones; detoxifying chemicals like pesticides, preservatives, medications, and environmental pollutants; and storing calcium ions that are necessary for various cellular processes such as neurotransmitter release in nerve cells.
_________ is the least developed of a newborn baby's senses.
The least developed sense in a newborn baby is vision.
Explanation:The least developed sense in a newborn baby is vision. Newborns' vision is not yet fully developed as both the retinas and the parts of the brain involved in vision are still immature. Most newborns can only focus on objects that are directly in front of their face and about 46 cm away.
The _____ is attached to the large intestine and assists in development of immunity.
The organ attached to the large intestine that assists in immunity development is the appendix. It is a part of the mucosa-associated lymphoid tissue (MALT) and aids in defending against pathogens in the alimentary canal. Furthermore, the appendix can serve as a reservoir for beneficial gut bacteria during illnesses.
Explanation:The organ attached to the large intestine that assists in the development of immunity is the appendix. Although it is often considered vestigial, meaning it no longer carries out its original function, the appendix houses lymphoid tissue, suggesting that it plays a part in the human immune response. In this capacity, it functions as part of the mucosa-associated lymphoid tissue (MALT), which includes structures like Peyer's patches.
MALT plays a significant role in immune response within the alimentary canal, specifically in the ileum region. The Peyer's patches, present in the ileum, contain clusters of lymphocytes, immune cells that play a crucial role in protecting the body from pathogens. These structures are designed to detect and react to potential pathogens that enter the body through the food we eat, hence their strategic location in the digestive tract.
In addition to this immune function, the appendix's twisted structure allows it to serve as a sort of safe haven for beneficial bacteria in the gut. During illnesses that cause diarrhea, these bacteria can be flushed out of the gut, but the appendix can serve as their reservoir, allowing for quicker repopulation of beneficial bacteria in the gut after the ailment has passed.
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Mentally rehearsing one's resentments contributes to ________ perspiration levels and ________ blood pressure levels than mentally rehearsing forgiveness.
Mineral-rich water, heated by newly formed oceanic crust, escapes through cracks in the ocean floor called _____.
A)hydrothermal vents
B)rifts
C)hydrothermal trenches
D)nodules
PLEASE NO BS ANSWERS.THEY WILL BE DELETED!
Answer:
Option (A)
Explanation:
Hydrothermal vents are the vents that are formed due to the eruptions of the underwater volcanoes. It is the region where the magma coming out to the surface reacts with the seawater. This seawater gets heated and emerges again to form these vents.
Hydrothermal vents are responsible for holding specific types of ecosystems containing various species of organisms within the deep ocean. It balances the chemical composition of ocean and the circulation of essential minerals.
These vents emit black as well as white smokes which are commonly known as black smokers and white smokers respectively.
Thus, the correct answer is Option (A).
During transcription, which end of the new rna molecule protrudes from the rna polymerase?
Dna fingerprints used as evidence in a murder trial look something like supermarket bar codes. the pattern of bars in a dna fingerprint shows _____. the order of bases in a particular gene
The pattern of bars in a DNA fingerprint shows the variability in DNA sequences among individuals, which can be used for forensic analysis and paternity testing. DNA fingerprinting involves several steps including DNA extraction, the use of restriction enzymes, PCR amplification, and gel electrophoresis to generate unique band patterns for comparison.
Explanation:The pattern of bars in a DNA fingerprint shows the variability in DNA sequences among individuals. The process of DNA fingerprinting involves extracting DNA from a sample of body fluid such as blood, semen, or saliva. The DNA is then cut into fragments using restriction enzymes, amplified by polymerase chain reaction (PCR), and separated by size using agarose gel electrophoresis. The resulting band pattern is unique to each individual and can be used in forensic analysis to match a suspect to evidence found at a crime scene.
DNA fingerprinting can also be applied in paternity testing to determine fatherhood by comparing the DNA sequence of a child to the potential father. DNA's comprehensive role includes not only crime solving but also paternity testing, human identification, genetic testing, and a wide array of medical and research applications. As every person has a unique DNA profile, except for identical twins, DNA analysis can be a powerful tool in connecting individuals to specific biological evidence.
Scientists distinguish whether an entity is a living or nonliving by describing the.....? of life.
Answer:
the correct answer would be- characteristics of life.
Explanation:
Distinguishing an entity as a living entity or nonliving entity scientifically is not based on one single thing or character. It is determined by the various characters of life.
The characteristics of life that are helpful in finding out if an individual entity is living or non-living are-
Homeostasis ability,
ability to use energy and obtain it,
Ability to reproduce,
Complexity,
Movement,
Metabolism, and
Heredity.
Thus, the correct answer is - characteristics.
The client with a peptic ulcer is prescribed antibiotics and bismuth salts. the nurse explains that this combination of medications will:
The interactions that occur in a pond are part of a(n) _____.
Which theorist is responsible for suggesting that the distribution of phobias in the human population can be explained by biological preparedness?
Which type of epithelial tissue shown is a stratified tissue?
The intermediate stage between snow and glacial ice is called
The insula is considered to be part of the ________. the insula is considered to be part of the ________. hypothalamus cerebrum cerebellum thalamus
The correction option is d) cerebrum
What is insula?The insula, insular cortex or the insular lobe is a part of the cerebral cortex located in both hemispheres.
Anatomically insula is a thin ribbon of gray matter tissue folded deep within the lateral sulcus that lies just deep to the lateral brain surface, separating the temporal lobe from the inferior parietal cortex.
The insula is involved in gustatory and sensorimotor processing, risk-reward behavior, autonomics, pain pathways, and auditory and vestibular functioning.
The insula serves connection with the brain structures including Neocortex, Basal ganglia, Thalamus, Limbic system and the olfactory cortex.
Thus, it is clear the insula however, serves connection with different brain structures but it is originally considered to be part of the cerebrum.
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When blood volume increases to the point that cardiac cells are stretched, the heart releases what natriuretic hormone?