How did whales evolve from land mammals? Reason
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(vestigial structures- a structure in an organism thst has lost all or most of its original function in the course of evolution)
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True or false carbohydrates also make up part of the cell membrane
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Which of the following does NOT describe the macronucleus of a paramecium?
A. The macronucleus does not disintegrate during conjugation.
B. The macronucleus is not exchanged during conjugation.
C. The macronucleus has multiple copies of the genes that are used in day-to-day activities.
D. The macronucleus forms from the fusion of micronuclei.
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The macronucleus contains the working copies of genes needed to support an enormous cell. It is formed by a division of the fused diploid nucleus after conjugation followed by multiple rounds of internal gene replication which does not occurs in the micronucleus.
Final answer:
The correct option describing what does NOT occur in a paramecium macronucleus is D: The macronucleus forms from the fusion of micronuclei. The macronucleus actually develops from the micronuclei after conjugation without any fusion of micronuclei.
Explanation:
To address the student's question regarding the macronucleus of a paramecium, we must examine each statement provided:
A. The macronucleus does not disintegrate during conjugation: This statement is true as the macronucleus disintegrates, and new ones form from the micronuclei after conjugation.B. The macronucleus is not exchanged during conjugation: This statement is true; during conjugation, paramecia exchange micronuclei, not macronuclei.C. The macronucleus has multiple copies of the genes that are used in day-to-day activities: This statement is true; the macronucleus contains multiple copies of the genome for metabolic and developmental functions.D. The macronucleus forms from the fusion of micronuclei: This statement is false, and therefore, is the correct option for describing what does NOT occur. Indeed, the macronucleus is not formed by the fusion of micronuclei. Instead, new macronuclei develop from the micronuclei post-conjugation, but there's no fusion involved in this process.Thus, the correct response to the student’s question is option D: The macronucleus forms from the fusion of micronuclei.
Which of the following is an example of natural resources? (4 points)
Factories, good roads, and a large population
Rich soil, forests, and minerals
Automobiles, dairy farms, and governments
Stores, chemical companies, and clothing factories
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hope this helps
It's B.
This is because forests are renewable; trees grow back over a small period of time. Minerals do as well, and rich soil can earn back its nutrients through time.
Automobiles are not renewable as they give off carbon dioxide, which would be referred to as a greenhouse gas. One that keeps heat in our atmosphere.
Chemical companies dispose of harmful gasses and chemicals that are harmful to our earth, as well as factories.
Malfunction in a control pathway for prolactin suppose that a woman had to have part of her thyroid gland surgically removed. she would most likely suffer from a condition known as hypothyroidism due to too little thyroid function. predict how this woman's hypothyroidism would affect prolactin levels in her body. which choice describes how surgical hypothyroidism would likely affect prolactin levels?
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the cells of unicellular organisms are A.) specialized to perform specific tasks B.) larger than those of multicellular organisms C.) able to carry out all of the functions necessary for life D.) unable to respond to changes in the environment
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Your answer is most likely C
I hope this helps.
HAPPY HALLOWEEN
The cells of unicellular organisms are capable of performing all of life's essential functions and responding to their environment. Unlike multicellular organisms where cells are specialized for specific tasks, each unicellular organism carries out all functions within a single cell. However, multicellular organisms offer higher levels of organization and complexity.
Explanation:The cells of unicellular organisms, such as bacteria, can carry out all the functions necessary for life. Unlike the cells of multicellular organisms which are specialized, each cell of a unicellular organism can perform tasks essential for its survival, such as converting the energy in sugar molecules into energy in ATP. At the same time, these cells can also respond to their environment by turning on and off specific genes according to the demands of their surroundings.
Despite this adaptability, unicellular organisms do not have the level of complexity or organization seen in multicellular organisms. Organisms composed of multiple cells can coordinate between distantly located cells and have developed systems such as a circulatory system or an efficient respiratory system to bring nutrients and oxygen to their cells respectively. Furthermore, these cells become more efficient by becoming specialized, doing fewer tasks but doing them extremely well.
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The ion needed to initiate the release of acetylcholine into the synaptic cleft is
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The ion needed to initiate the release of acetylcholine into the synaptic cleft is the calcium ions.
What is a Synaptic cleft?A synaptic cleft may be defined as the type of tiny space after the axon terminal of the pre-synaptic neuron and initiation of the cell body or dendrites of the postsynaptic neuron. It is also known as the synaptic gap.
When the presynaptic membrane of an axon terminal is depolarized, it induces the opening of voltage-gated calcium ion channels. It allows the influx of calcium ions inside the cell.
This entry of calcium ions induces the fusion of synaptic vesicles with the membrane and finally the liberation of neurotransmitters such as acetylcholine molecules into the empty space which is known as the synaptic cleft.
Therefore, calcium ions are needed in order to initiate the release of acetylcholine into the synaptic cleft.
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From the origins of the human species some 3 million years ago until about the year 1800, most people in the world lived in which type of societies
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agrarian
hunting and gathering
horticultural and pastoral
GOOD LUCK!!
what types of carbohydrates are made of chains of alpha and beta glucose?
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A nurse is caring for a client who recently underwent a total hip replacement. the nurse should:
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What is the primary storage form of carbohydrate in the body?
a. glucagon
b. glucose
c. starch
d. fiber
e. glycogen?
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Glycogen is the primary storage form of carbohydrates in the body, stored in liver and muscle cells, and is broken down into glucose when needed.
Explanation:The primary storage form of carbohydrate in the body is e. glycogen. Glycogen is made up of glucose monomers and is a highly branched molecule, usually stored in liver and muscle cells. Glycogen functions as the animal equivalent of starch. When the blood glucose levels decrease, the body breaks down glycogen into glucose in a process called glycogenolysis, maintaining the homeostasis of glucose levels in the bloodstream.
What is the purpose of the villi and microvilli of the small intestine and the circular folds of the large intestine?
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And in large intestine, those folds can also increase the surface area for reabsorption of unabsorbed food, mostly water.
Final answer:
The villi and microvilli of the small intestine significantly increase the surface area to optimize the absorption of nutrients, while the circular folds of the large intestine help in slowing down waste to absorb water and electrolytes.
Explanation:
The purpose of the villi and microvilli in the small intestine is to augment the available surface area to maximize the absorption of nutrients. Absorptive cells that line the small intestine have microvilli, small projections that further boost surface area for enhanced nutrient absorption. Additionally, the small intestine is characterized by folds, known as villi, which are covered with microvilli, enlarging the surface area up to 600 times. This adaptation facilitates efficient digestion and absorption due to the extensive contact area for digestive enzymes and nutrient uptake. The folds in the mucosa are akin to the corrugations of cardboard, aiming to maximize the surface area in a limited space. Each villus encompasses a network of blood and lymph vessels that transport the absorbed nutrients throughout the body.
On the other hand, the large intestine features circular folds, which primarily function to slow the passage of waste material, allowing for more time to absorb water and electrolytes. The large intestine does not have villi or microvilli as its primary function is concerned with water absorption and waste formation rather than nutrient absorption.
Which process brings energy to the biosphere?
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Photosynthesis is the process by which energy from the sun is trapped and used to produce food by plants. During photosynthesis, carbon dioxide and water react together in the chloroplast in the presence of sunlight to form starch and oxygen. Oxygen is the by product of the reaction. The energy from the sun is stored inside the starch molecule in form of chemical energy and this energy is made available to the animals when they consume the produced starch. Thus, photosynthesis is the source of all energy in the biosphere.
what was the most likely source region for the air mass over pennsylvania
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The air mass over Pennsylvania typically originates from the continental polar region (bringing cold, dry air) or the maritime tropical region (bringing warm, moist air).
Explanation:The source region for the air mass over Pennsylvania is typically the continental polar or maritime tropical regions. These source regions typically influence the climate and weather patterns of the state. Continental polar air masses originate from the northern plains of Canada and bring cold, dry air. Maritime tropical air masses originate from the Gulf of Mexico and bring warm, moist air. The type of air mass over Pennsylvania can change depending on the season and weather patterns.
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5 bags with baseballs in them that weigh 21.56 if each bag weighs the same, how much does each bag weigh
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21.56 divided by 5 = 4.312.
So, the answer is 4.312lbs.
Why is sandstone considered a rock and NOT a mineral? What characteristics of a mineral does it not meet? Answer in at least 2 sentences
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Sandstone is not considered to be a mineral because, it did not meet all the criteria of mineral substances. Sandstone does not have a crystalline structure.
Final answer:
Sandstone is a rock because it lacks a consistent crystal structure and is made up of various minerals and particles, unlike a mineral which must have a unique crystalline structure and a specific chemical formula.
Explanation:
Sandstone is considered a rock and not a mineral because it does not have a consistent internal crystal structure and is not composed of a single substance. A mineral, by definition, is a naturally occurring, inorganic solid with a specific chemical formula and a unique crystalline structure. Sandstone fails to meet these criteria because it is a clastic sedimentary rock composed of sand-sized particles that can include a variety of minerals like quartz and feldspar, as well as rock fragments or organic material. Different parts of sandstone may have different compositions, making it heterogeneous. Furthermore, sandstone is often found in layers or beds, can be granular or gritty, and displays physical characteristics like color variation and potentially containing fossils, which are not features specific to minerals.
In any ecosystem, all incoming energy will eventually be
A. passed on to the decomposers when organisms die
B. released into the surrounding environment as heat
C. transferred up from one trophic level to the next
D. used by plants in the process of photosynthesis
A reaction in which the reactants have a greater amount of free energy than the products that are formed will be
A. endergonic, with a net release of free energy to the surroundings
B. endergonic, absorbing free energy from the surroundings
C. exergonic, with a net release of free energy to the surroundings
D. exergonic, absorbing free energy from the surroundings
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1. In a population of 200 field mice, 98 mice are homozygous dominant for brown fur (FF), 84 mice are heterozygous (Ff), and 18 mice are homozygous recessive and have white fur (ff).
A. What are the genotype frequencies of this mice population?
FF =
Ff =
ff =
B. What are the allele frequencies of this population?
F allele =
f allele =
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The genotype frequencies can be determined by dividing the number of individuals with a genotype by the total number all the individuals.
FF genotype frequency:
98÷200=0,49. There are approximately 5 homozygous dominant mice in 10.
Ff genotype frequency:
84÷200=0,42. There are approximately 4 heterozygous mice in 10.
ff genotype frequency:
18÷200=0,09. There are approximately 1 homozygous recessive mouse in 10.
B.
To determine the frequency of an allele we can divide the number of times that the allele appears by the total number of alleles.
F allele frequency:
[tex] \frac{(98*2)+84}{400} [/tex]=0.7
There are 7 F alleles in 10 random alleles.
f allele frequency:
[tex] \frac{84+(18*2)}{400} [/tex]=0.3
There are 3 f alleles in 10 random alleles.
Which mutation is harmful to the organism? a mutation allowing moths to camouflage better on blackened tree bark a mutation making Staphylococcus aureus resistant to the antibiotic methicillin: a. mutation inhibiting human immunodeficiency virus from attaching to and entering the cell b.mutation causing uncontrolled cell division a mutation giving plant leaves a bitter taste to discourage herbivores from eating them
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Mutation causing uncontrolled cell division is the correct answer.
Mutation causing uncontrolled cell division.
Here the mutation will cause cancer.Other mention mutations will help in survival of the organism so they are helpful.What is mutation?Mutation, an alteration in the genetic material of a cell of a living organism or of a virus that is more or less permanent and that can be transmitted to the cell’s or the virus’s descendants.Mutations in egg or sperm cells may result in an individual offspring all of whose cells carry the mutation, which often confers some serious malfunction.Mutations are random changes, they are expected to be mostly deleterious, but some may be beneficial in certain environments.Mutation is the main source of genetic variation, which is the raw material for evolution by natural selection.
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true or false : the endoplasmic reticulum is in charge of decoding the messenger RNA to produce proteins
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Why algae in the ocean can have a very high NPP and a very low amount of stored biomass
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Pain in one part of the body resulting from injury in another part is called
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_____________________________________________
What are the nurse's responsibilities regarding a living will?
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A living will is a legal document that the patient has written of instructions they would like the nurse to follow when it is their time to pass away. For example, if they die and their will says to allow a museum to take his brain, the nurse must allow this since it is written in a legal document. Or they could write if they are for sure going to die then they just want them to pull the plug. Or if they are on life support to pull the plug and let them pass. These are instructions the nurse must follow as it is a legal dying wish document.
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I am, yours most sincerely,
SuperHelperThingy
What is the difference between whole-chromosome aberrations and point mutations?
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A chromosome variation from the norm, issue, inconsistency, distortion, or change is a missing, additional, or unpredictable bit of chromosomal DNA. It can be from an atypical number of chromosomes or a basic anomaly in at least one chromosomes.
During toddlerhood, children do not need as much of this to maintain a constant body temperature.
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When a doctor observes your symptoms and tells you that you have flu, she is reasoning?
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When a doctor observes the symptom of a patient and tells that he or she is likely having a flu, the reasoning she or he used is likely from the effect to cause. The reasoning from effect to cause is having to check on the cause in order to produce or come out with the effect in which the symptoms is the cause of the flu, in which the flu is the effect.
The nurse is caring for a client who has a multifetal pregnancy. what topic should the nurse prioritize during health education
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Human processes mainly contribute to the
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what happens to food energy during photosynthesis
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Why is a fat-free diet dangerous?
It can cause the body to break down muscle tissues.
It can result in a deficiency of essential carbohydrates.
It can result in a deficiency of essential fatty acids.
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It can result in a deficiency of essential fatty acids.
A child recovering from a severe asthma attack is given oral prednisone 15 mg twice daily. what is the priority nursing intervention
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The priority nursing intervention would avoiding exposure of the child to infection. The explanation behind this is prednisone decreases the child's resistance to definite infectious progressions and, as an anti-inflammatory drug, covers infection. The child will self-limit action contingent on respiratory status. The eosinophil count is frequently reliably improved in children with asthma. The child will need sufficient hydration to help release and eject mucus.