FREE MTTC Biology Questions and Answers

Question 1

Which of the following safety precautions would be most crucial for students to adhere to throughout this experiment?

Accepted Answer

Wear safety glasses when heating and cooling the flasks.

Answer

Place filled flasks in a secure location away from class activities.

Answer

Wear latex gloves when collecting the water from the marsh.

Answer

Use pipettes to fill the flasks rather than pouring water from the bucket.

Question 2

The experiment's dependent variable is:

Accepted Answer

the number of living organisms present in each flask.

Answer

the length of time each flask was heated.

Answer

the length of time the flasks stood at room temperature.

Answer

the maximum temperature to which each flask was heated.

Question 3

British chemist Rosalind Franklin is well recognized for her work as an x-ray crystallographer. Her work contributes to our knowledge of:

Accepted Answer

the double-helical structure of DNA.

Answer

regulation of the Lac operon.

Answer

the structures and function of genes.

Answer

the shapes of the active sites of important enzymes.

Question 4

Specific antibiotic classes have been shown to disrupt bacterial ribosomes. Which of the following biological processes would this interference actually stop?

Accepted Answer

translation

Answer

transcription

Answer

photosynthesis

Answer

DNA replication

Question 5

Which of the following essential effects on living things is caused by water's high specific heat?

Accepted Answer

It moderates environmental temperature fluctuations.

Answer

It maintains elevated body temperatures.

Answer

It prevents the freezing of the cytosol of cells.

Answer

It supplies the energy needed to drive metabolic processes.

Question 6

Which of the following outcomes is most likely to result from a single nucleotide insertion or deletion in a prokaryotic gene?

Accepted Answer

It will shift the reading frame and likely result in a nonfunctional polypeptide.

Answer

It will prematurely halt transcription at that point.

Answer

It will have minimal effects on the resulting polypeptide due to redundancy of the genetic code.

Answer

It will result in the substitution of a different amino acid for the normal one only at that location.

Question 7

Which of the following describes how the exoskeleton of arthropods differs from the endoskeleton of vertebrates?

Accepted Answer

The exoskeleton must be shed as the organism grows, which leaves the organism unprotected for a time.

Answer

The exoskeleton is relatively rigid, which restricts the movement capabilities of the organism.

Answer

The exoskeleton contains chitin, which is weaker for its weight than bone.

Answer

Muscles must be attached to the interior of the exoskeleton, which reduces their mechanical advantage.