The fossil record is the type of evidence that is used with molecular clocks to estimate the split from a common ancestor.
What is a molecular clock?A molecular clock is an estimation of the times of divergence used for the study of biological phenomena.
Molecular clocks are based on fossils found for a given species and the mutation rate of a given genomic sequence.
In conclusion, fossils are used as point of reference to build molecular clocks based on the mutation rate of homo-logous nucleotide sequences for a given taxonomic group for which these fossils belong.
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for each phenotype, list the genotypes (Remember to use the letter of the dominant trait)
* Straight hair is dominant to curly:
_____Straight
_____Straight
_____Curly
*Tail spikes are dominant to plain tails:
_____pointed
_____pointed
_____round
explain how RNA can serve as hereditary information
Answer: Genetic code (genes and genome) and the mechanisms of replication.RNA determines a cell’s function, synthesizing proteins and enzymes. Mutations, changes in DNA instructions, are the molecular basis of evolution. Nucleic Acids are the basis for the storage and transmissions of hereditary information in all cells.
Explanation:
RNA serves as the hereditary information for viruses that lack DNA. Although, typically single-stranded in most cells, in viruses they can be either single-stranded or double-stranded. Double-stranded RNA is an indicator or a viral infection.
Land heats and cools more than water because ________.
Land heats and cools more because it has a lower specific heat capacity that water.
To answer the question, we need to know what heat is
What is heat?This is the amount of thermal energy in a body
What is specific heat capacity?This is the amount of heat required to raise 1 kg of substance by 1 °C.
So, the greater the specific heat capacity, the greater he amount of heat required.
Since land which has a specific heat capacity of less than 1 J/g-°C and water which has a specific heat capacity of 4.2 J/g-°C, thus, land heats and cools more because it has a lower specific heat capacity that water.
So, land heats and cools more because it has a lower specific heat capacity that water.
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Robert Hooke first observed cork under a microscope in jail so he named the small cubicles cells
False True
Robert Hooke first observed cork under a microscope in jail so he named the small cubicles cells is False.
Though "Robert Hooke" was the first person to observe cork under a microscope. He named the small cubicles cells because it used to remind him of the cells in the monastery
What is Robert Hook's discovery?Discovered microscopeDiscovering cells while observing a piece of cork under a microscopeRobert hook is considered the father of cell theoryHe found cell is a small structure and due to his discovery others were able to study more about the cell and explained that the cell is the basic unit of life.
Thus, the answer is false.
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Explain the propagation of electrical impulses along a neuron including the role of myelin
Nerve impulses are signals that are transmitted along nerve fibers of the body.
Nerve impulses are electrical impulses. They are generated in response to stimuli.
These electrical impulses create:
action potentials as waves of depolarization that moves along the axons.The axons contain voltage-gated ion channels that are either opened or closed by depolarization (which is the opening of ion channels leading to changes in membrane potential)
Depolarization further causes other channels to open and close thus spreading across the entire length of the axon and into another nerve cell (neuron).
Myelin sheaths act as buffers and through salt conduction help increase the speed of electrical impulses through the neurons. Not every nerve cell is insulated with a myelin sheath.
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Indicate the relationship between the two items listed in each situation: (can be used more than once or not at all) - A. Resting neuron's permeability to K B. Resting neuron's permeability to Na - A. Neuron's permeability to Na during the rising phase of an action potential B. Neuron's permeability to K during the rising phase of an action potential - A. Resting neuron's permeability to Na B. Neuron's permeability to Na during the rising phase of an action potential - A. Resting neuron's permeability to K B. Neuron's permeability to K during the falling phase of an action potential - A. Neuron's permeability to Na during the falling phase of an action potential B. Neuron's permeability to K during the falling phase of an action potential a. A and B are equal. b. A is greater than B. c. B is greater than A.
The permeability of the neuron membrane to Na and K differs with the stages of action potential as follows:
A is greater than BA is greater than BB is greater than AWhat is an action potential?An action potential is a sudden change in the voltage across the membrane of a resting neuron resulting in transmission of impulse.
An action potential results in variation of neuronal membrane to sodium and potassium ions.
A. Resting neuron's permeability to K >>> B. Resting neuron's permeability to Na
Thus, A is greater than B.A. Neuron's permeability to Na during the rising phase of an action potential >>> B. Neuron's permeability to K during the rising phase of an action potential.
Thus, A is greater than B.A. Neuron's permeability to Na during the falling phase of an action potential <<< B. Neuron's permeability to K during the falling phase of an action potential.
B is greater than A.Therefore, the permeability of the neuron membrane to Na and K differs with the stages of action potential.
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What were the two achievements of the first women’s rights convention at Seneca Falls?
The women’s rights convention at Seneca Falls was the first largest convocation of women of its kind in the United States of America.
What is the women convention?The women convention was the first largest convocation of women of its kind in the United States of America. The subject of discussion was the right of women.
The two main achievements of the convocation were;
1) The launching of the women's suffrage movement
2) The fact that women were later allowed to vote
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Which of the following represents a polar covalent compound?
H₂O
Cl₂
O2
NaCl
Answer:
NaCl
Explanation:
Question 14 of 20
You have two rocks made of the same material that are at the same
temperature. The first rock has three times the mass of the second rock. How
does the thermal energy of the two rocks compare?
A. The first rock has six times the thermal energy of the second rock.
B. The second rock has three times the thermal energy of the first
rock.
C. The second rock has one-third as much thermal energy as the first
rock.
D. The rocks have the same amount of thermal energy.
Answer:
The rocks have the same amount of thermal energy.
What info so cladistics give?
Cladistic analysis provides information about the evolutive relationship between taxa according to derived characters. This information is represented in a cladogram.
What information does cladistics provide?
The cladistic analysis provides information about the relationship between different taxa according to shared characters.
This information is represented in a cladogram that uses derived characters to express the evolutive relationships between groups.
Derived characters emerge and are inherited by all the descendant groups, meaning that all of them carry these traits until they disappear.
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Help please help! Need help
Answer:
option c. 1 is correct.
*For detailed explanation refer to the attachment.
During appositional growth of cartilage, the cells that produce the matrix are the:
During the appositional growth of cartilage, the cells that produce the matrix are the chondroblasts.
What are chondroblasts?Chondroblasts are a type of specialized cell found in bone tissues that help with its growth.
Appositional growth is a special type of growth in the bones where the medulla cavity undergoes reabsorption.
In conclusion, during the appositional growth of cartilage, the cells that produce the matrix are the chondroblasts.
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A camel has a hump to store water so it can survive in its desert environment. Which kind of adaptation is this?
A camel’s hump is an example of
adaptation.
Answer:
Camels actually store FAT and not water in their hump. This is called structural adaption.
Explanation:
Camels’ unique physiology and adaptations allow them to survive, even in the harshest conditions of the desert. Camels have thick fur to protect them from the heat, fat hump to serve as food storage, they rarely sweat, and can go for weeks without water. These are only a few reasons how camels survive in the desert, even without water.
Hope this helps you!
Cod fry often settle under the bell of some jellyfish species, whose tentacles are poisonous. Name the form of relationship illustrated by this example. Assume the mechanism of formation of this device
Answer:
Explanation:
해파리 (cnidarians) have a worldwide distribution. Despite most being harmless, some species may cause local and also systemic reactions. 처치 of 해파리 envenomation is directed at: alleviating the local effects of venom, preventing further nematocyst discharges and controlling systemic reactions, including shock. In severe cases, the most important step is stabilizing and maintaining vital functions. With some 차이점 between species, there seems to be evidence and consensus on oral/topical analgesics, hot water and ice packs as effective painkillers and on 30 s application of domestic vinegar (4%–6% acetic acid) to prevent further discharge of unfired nematocysts remaining on the skin. Conversely, alcohol, methylated spirits and fresh water should be 조심스럽게 avoided, since they could massively discharge nematocysts; pressure immobilization bandaging should also be avoided, as laboratory studies show that it stimulates additional venom discharge from nematocysts. Most 처치 approaches are presently founded on 상대적으로 weak evidence; therefore, further research (especially randomized clinical trials) is strongly recommended. Dissemination of appropriate 처치 modalities should be deployed to better inform and educate those at risk. Adequate signage should be placed at 바닷가 to notify tourists of the jellyfish risk. Swimmers in risky areas should wear 보호 장비.I need help. The four main types of macromolecules found in organisms are carbohydrates, lipids, nucleic acids, and ?
Answer:
Proteins
Explanation:
These are the carbohydrates, lipids (or fats), proteins, and nucleic acids. All of the major macromolecule classes are similar, in that, they are large polymers that are assembled from small repeating monomer subunits.
When sugar is produced in the leaves
due to photosynthesis, they can be transported to the roots. In this example, what is the sugar sink?
A. the leaves
B. the roots
C. the sun
how is ""maximum"" tension achieved in a whole muscle (assuming optimal length)?
The maximum tension achieved in a whole muscle by stretching a muscle to its optimum length.
What is maximum tension of a muscle?The maximum tension of a muscle is the maximum force that a muscle can generate when contacting.
The maximum tension equates to the maximum work that a contracting muscle can do.
The maximum tension achieved in a whole muscle by stretching a muscle to its optimum length where actin–myosin interactions are maximal.
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Determine which type(s) of blood this patient can safely receive. Check all that apply. A B AB O Also, the patient should receive blood that is for Rh.
People who are AB can receive blood from all types of blood groups.
What is Blood group?This is the classification of blood based on polymorphisms in antigens on the surfaces of the red blood cells.
There are four types of blood groups and the AB is known as universal recipient which means it can receive blood from any of them. Also the patient should receive blood that is positive for Rh as it will not make anti-Rh antibodies which may destroy cells of the fetus.
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Answer: B and O........ Also, the patient can recieve blood that is NEGATIVE (only)
Explanation: these are the correct options on edge, i hope this helps!! :D
what are pollination and fertilization?
This functional group consists of phosphorous bonded to three oxygens and double-bonded to one oxygen. Which functional group is shown in this image? O=P OT O This functional group consists of phosphorous bonded to three oxygens and double - bonded to one oxygen . Which functional group is shown in this image ? O = P OT O
The biomolecule which consists a functional group in which phosphorous bonded to three oxygens and double-bonded to one oxygen is Adenylic acid.
Adenylic acid is a nucleotide.
A nucleotide has three chemically distinct components.
One is a heterocyclic compound, the second is a monosaccharide and the third a phosphoric acid or phosphate unit.
It is a building block for a nucleic acid.
the heterocyclic compounds in nucleic acids are the nitrogenous bases named adenine, guanine, uracil, cytosine, and thymine. Adenine and Guanine are substituted purines while the rest are substituted pyrimidines. The skeletal heterocyclic ring is called as purine and pyrimidine respectively. The sugar found in polynucleotides is either ribose (a monosaccharide pentose) or 2' deoxyribose. A nucleic acid containing deoxyribose is called deoxyribonucleic acid (DNA) while that which contains ribose is called ribonucleic acid (RNA).
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I need the answer asap
Answer:
Executive
Explanation:
having the power to put plans, actions, or laws into effect.
Which statement about generic disease is true
A
B
C
Answer:
B. Genetic diseases are CURABLE but not TREATABLE.
In part of the model, materials move out of the bag and into the water. which
of the following cell processes does this best model?
a. substances move from an area of low concentration to an area of
high concentration.
b. small molecules easily pass between the phospholipids in the cell
membrane.
c. transport proteins use energy to push large molecules across the
cell membrane.
o d. a vacuole opens to release substances into the area outside the
cell.
previous
Answer:
small molecules easily pass through the phospholipids in the cell membrane
Cartilage is separated from surrounding tissues by a fibrous.
Cartilage is separated from surrounding tissues by a perichondrium.
What separated the cartilage from the tissue?Cartilage is separated from the surrounding tissues by perichondrium. It consist of two layers i.e. Outer Fibrous Layer that provides protection, mechanical support. It also attaches the cartilage to other structures.
So we can conclude that Cartilage is separated from surrounding tissues by a perichondrium.
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According to the research, cartilage is separated from surrounding tissues by a fibrous perichondrium.
What is a cartilage?It is a specialized connective tissue that is devoid of nerves, blood vessels and lymphatic vessels.
These tissues allow the joints to move, protect the ends of the bones and act as a support against possible blows.
Therefore, we can conclude that according to the research, cartilage is separated from surrounding tissues by a fibrous perichondrium.
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30. 9) To complete this Venn Diagram, label the following cell parts as A (Prokaryotic), B (common to both) or C (Eukaryotic) characteristics:
A B C
Prokaryotic
Eukaryotic
capsule
flagella
cell wall (incl. plants)
cytoplasm
cell membrane
nucleus
The presence of the Capsule is the characteristic of the prokaryotic cells only. Hence, it is placed under A. While the nucleus is only found in the eukaryotic cell. Hence, it is placed under C. Rest all, flagella, cell wall, cytoplasm, and cell membrane (plasma membrane) are found in both types of cells. Hence, they are all placed under B.
What are Prokaryotes?Prokaryotes may be defined as a tiny single-celled organism that has neither a characteristic nucleus with a membrane nor other specialized organelles. For example, bacteria and cyanobacteria.
The basic difference between eukaryotic and prokaryotic cells is that eukaryotic cells have a well-defined nucleus with membrane-bound cell organelles, while prokaryotic cells do not have such kinds of arrangements.
Therefore, it is well described above.
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when can exponentail growth occur in a population
Answer: d
Explanation:
How does the dna rate of travel differ for small dna fragments and large dna fragments?.
Answer:
Small fragments travel farther than large fragments. A high voltage rate will cause the DNA fragments to move slowly across the gel
your instructor gives you an unknown organ for you to examine and identify through microscopy. what should you do first with the sample?
When examining an unknown organ and identifying it through microscopy, it is required fix it with preservative.
What is a preservative?A preservative is a specific chemical compound used to conserve a biological sample.
In microscopy, preservatives are very useful to study the anatomy of body parts and their cells.
In conclusion, when examining an unknown organ and identifying it through microscopy, it is required fix it with preservative.
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How many nuclei do neutrophils have?
Neutrophils have only one nucleus with between two to five lobes present in its cells.
What is a Neutrophil?These are granulocytes and comprise of majority of the white blood cells found in the body.
They however have only one nucleus but are multi lobed in their structural composition thereby making it the most appropriate choice.
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Which statement is correct?
O Theories are accepted as true when a single experiment yields similar results to another one.
O When a scientist finds a new way to test a hypothesis, experimental methods do not change.
O Theories may be revised over time as information is discovered or technology is developed.
O When a scientist finds a new way to test a hypothesis, the original theory is made into a law.
Answer:
Theories may be revised over time as information is discovered or technology is developed.
Explanation:
A scientific theory is a term used when a statement tries to explain a natural phenomenon of nature based on scientific facts. In short, a theory is the representation of a set of hypotheses that was confirmed through an experiment and that tries to explain a phenomenon, but leaves room for revisions and updates to its explanation.
For this reason, we can say that theories are reformulated, revised and even discredited, when the advancement of scientific knowledge and technology allows the creation of new studies that show a different explanation and more consistent with reality.
Answer:C
Explanation:
