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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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What is the first thing to occur in dna replication?

12345 [234]

The first thing is that the enzyme, DNA helicase
breaks the hydrogen bonds to unzip the double strand of dna for replication to take place

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3 years ago

What is the evolutionary advantage of the heart having its own electrical system?

SpyIntel [72]

The heart’s electrical system is responsible for making and conducting signals that trigger the heart to beat. These signals cause the heart’s muscle to contract. With each contraction, blood is pumped throughout the body. This happens 24/7 without us having to monitor it all the time so that our heart does not stop.

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3 years ago

Usatestprep--According to the model, what is the role of maltose in the maltose operon?

allsm [11]

Answer:

<u>Inducer</u>

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Explanation:

Structural proteins within bacteria are encoded along with their functions. These are typically found in a block of genes called an operon. They undergo transcription together with the use of a single promoter sequence to form a polycystronic transcript- this allows for the simultaneous control and regulation of biochemical pathways. This is efficient as these pathways would either need to function together when "switched on" or will not be needed when "switched off". Repressors are proteins that effectively hinder translation by binding to DNA at the operator site, blocking the activity of RNA polymerase in transcription. However inducers are small molecules that can displace these, freeing up the operon for transcription and the activation of relevant biochemical pathways.

The mal operon includes genes which mediate the breakdown of the substrate maltose in bacterial cells. Maltose, called a malt sugar, is a carbohydrate compound made up of two glucose molecules joined by an α-(1,4) glycosidic linkage.

In the presence of maltose, the inducer binds to the activator. This then allows for the binding of RNA polymerase, which facilitates translation and th epr

5 0

3 years ago

Read 2 more answers

The initial stage where a perceived threat or danger is experienced. This is when physiological reaction occurs that includes he

bagirrra123 [75]

Answer: Alarm reaction stage

Explanation:

The General Adaptation Syndrome (GAS) is the 3- stage body response to stress conditions. The three stages include

1) Alarm reaction stage

2) Resistance stage

3) Exhaustion stage

Note that the Alarm reaction stage consist of arousal by the autonomic nervous system, where several involuntary responses such as sweating, tension, raised breathing etc are observed due to hormones released.

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4 years ago

Which of the following is not a sign of possible pest infestation?

Brrunno [24]

The right answer is smelly garbage.

Infestation is the penetration into the body of a parasite whose nature is not microbial.

smelly garbage is not synonymous of infestation, because the olfactory system only detected smelly metabolites of these microorganisms. This does not necessarily mean that the microorganism has managed to penetrate the body.

By cons other proposals are signs and tools for infestation (torn packaging with food leaking out, dead insect bodysuits, feathers, and fur).

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3 years ago

Read 2 more answers