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3 years ago

What is needed to estimate species relatedness with a molecular clock?

Biology

1 answer:

Dvinal [7]3 years ago

5 0

Out of the following given choices;

A. DNA accumulates mutations at a regular rate

B. known mutation rate for a gene

C. the number of differences in DNA sequences for a gene in two species

D. the same gene identified in two species

E. All answers are corrects

The answer is E. The molecular clock used rates of mutation to determine the prehistoric time when two species that share a common ancestor diverged. The benchmarks for determining the mutation rate are often fossil or archaeological dates.

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How does a marshmallow contain carbon?

bulgar [2K]

Answer:

The sugar molecules in the marshmallow are being changed into carbon. Sugar can be changed into water molecules. When you toast marshmallows, the heat causes a chemical reaction producing water molecules which then evaporate, leaving the carbon behind.

Explanation:

6 0

3 years ago

Is foliation a characteristic of a sedimentary rock?

lara31 [8.8K]

Answer:

Explanation:

Metamorphic rocks

5 0

3 years ago

What is (are) the main difference(s) between passive transport and active transport? Group of answer choices Passive transport d

11111nata11111 [884]

Answer:

Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not.

Explanation:

Active Transport works against the concentration gradient and therefore needs energy to make it happen

Passive transport such as Diffusion and Osmosis uses the properties of natural movement of particles which moves the molecules from areas of high concentration to areas of low concentration or down the concentration gradient and happens passively without the need for energy

8 0

3 years ago

When an ionic compound such as sodium chloride (NaCl) is placed in water, the component atoms of the NaCl crystal dissociate int

PtichkaEL [24]

Answer:

The correct answer is C) 1 L of 1.0 M NaCl

Explanation:

NaCl is a ionic compound so it dissociates in water into Na⁺ and Cl⁻ ions. Glucose is a covalent solute so it does not dissociates into ions. So, when we dissolve NaCl we have twice the amount of particles in solution in comparison with glucose. According to this:

A) and B) are solutions with the same concentration (0.5 M) but NaCl solution will have more solute particles than glucose.

C) and D) are solutions with more solute amount because they are more concentrated (1 M), but NaCl solution will have more solute particles than glucose solution ( 1 mol of Na⁺ ions + 1 mol of Cl⁻ ions).

The solution with the greatest solute particle number is C).

5 0

3 years ago

The nucleus has a system of _____ embedded within its outer membrane which allows communication between the nucleus interior and

Bumek [7]

Answer:

pores

Explanation:

The nucleus consists of "nuclear pores" on its outer membrane. Each of these are surrounded by nuclear pore complex. It allows the pore to regulate the movement of molecules between the nucleus and the cytoplasm. It allows small particles to pass through such as ribosomal proteins. It prevents most large particles (except for histone) from passing through; thus, it is selective in nature. This function of the pores clearly shows that it allows communication to occur between the nucleus interior and the cytoplasm.

5 0

3 years ago