DNA polymerase synthesizes new DNA in the $$5' \to 3'$$ direction.

Question 1

Which of the following statements best describes the central dogma of gene function?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 2

A scientist is using the streak plate method to isolate a pure culture from a mixed bacterial sample. What is the primary purpose of this technique?

Accepted Answer

To separate individual bacterial cells so that each forms a distinct colony.

Question 3

Which of the following best describes a biofilm?

Accepted Answer

A complex community of microorganisms attached to a surface and embedded in a self-produced matrix.

Question 4

Which of the following is an example of a catabolic reaction?

Accepted Answer

The breakdown of glucose during glycolysis.

Question 5

Photoautotrophs require which of the following for energy and carbon?

Accepted Answer

Light for energy and carbon dioxide as a carbon source.

Question 6

Which of the following statements about DNA replication is correct?

Accepted Answer

DNA polymerase synthesizes new DNA in the $$5' 	o 3'$$ direction.

Question 7

Which of the following best describes semi-conservative DNA replication?

Accepted Answer

Each new DNA molecule consists of one parental strand and one newly synthesized strand.

Question 8

A researcher is using PCR to amplify a segment of DNA. Which enzyme is essential for this process, and what is the main function of this enzyme?

Accepted Answer

Taq polymerase; it synthesizes new DNA strands from a DNA template.

Question 9

Which of the following statements about restriction enzymes is correct?

Accepted Answer

They cut DNA at specific nucleotide sequences, producing either blunt or sticky ends.

Question 10

Which of the following is a function of reverse transcriptase in recombinant DNA technology?

Accepted Answer

It synthesizes complementary DNA (cDNA) from an RNA template.

Question 11

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious proteins that lack nucleic acids.

Question 12

A patient is diagnosed with tuberculosis. Which microorganism is the causative agent?

Accepted Answer

Mycobacterium tuberculosis

Question 13

Which of the following statements about endospores is correct?

Accepted Answer

Endospores are highly resistant structures formed by some bacteria, such as Bacillus and Clostridium.

Question 14

Which of the following best describes the arrangement of prokaryotic cells after binary fission in different planes?

Accepted Answer

It results in characteristic arrangements such as chains, clusters, or packets.

Question 15

Which of the following statements about the visible spectrum of light is correct?

Accepted Answer

The visible spectrum ranges from approximately $$400\ \mathrm{nm} to$$ $$700\ \mathrm{nm} in $$wavelength.

Question 16

Which of the following is true regarding the genetic material of viruses?

Accepted Answer

Viruses may contain either DNA or RNA, but not both.

Question 17

Which of the following statements about viroids is correct?

Accepted Answer

Viroids are infectious agents composed solely of circular RNA and infect plants.

Question 18

Which of the following is a correct statement about the process of mitosis?

Accepted Answer

A diploid nucleus produces two diploid nuclei, each genetically identical to the original.

Question 19

Which of the following statements about the use of embryonated chicken eggs in virology is correct?

Accepted Answer

They provide a suitable environment for the cultivation and study of viruses.

Question 20

A laboratory is using a viral plaque assay. What is the main purpose of this technique?

Accepted Answer

To quantify the number of infectious viral particles in a sample.

Comprehensive Study Notes for Microbiology Midterm (Chapters 1, 3, 4, 5, 6, 7, 8, 11, 12, 13)

Study Guide - Practice Questions