FREE AND STUDY GAMES ABOUT MICRO EXAM

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FREE AND STUDY GAMES ABOUT MICRO EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -49 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which pairing is incorrect?

Answer:

A:G

Question 2: is an example of negative control AND is affected by catabolite repression.

Answer:

The lac operon Question 3: are involved in negative control AND bind or do not bind to the operator depending on their shape (conformation).

Answer:

Repressors

Question 4: Irradiation of cells with ultraviolet light may cause

Answer:

thymine dimers.

Question 5: The placement of the amino acid during translation is determined by the

Answer:

complementarity of the codon-anticodon.Question 6: Segments of DNA capable of moving from one area in the DNA to another are called

Answer:

transposons.

Question 7: Thymine dimers are dealt with by

Answer:

photoreactivation repair AND excision repair.Question 8: Some bacteria have a higher incidence rate of thymine dimer mutations following exposure to UV light than others. What might be going on here to lead to this outcome?

Answer:

They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed AND they may have a weaker expression of photoreactivation enzymes, leading to more thymi Question 9: Strong chemical mutagens may be used to treat cancer cells. Is this a good or bad idea?

Answer:

Good and bad-they're very good at killing cancer cells, but depending on mode of administration, they could also be dangerous to non-cancerous cells.

Question 10: Which molecule carries an anticodon?

Answer:

tRNA

Question 11: The DNA site to which the repressor protein binds is the

Answer:

operator.

Question 12: The mechanism by which genes are transferred into bacteria via viruses is called

Answer:

transduction

Question 13: is responsible for the release of the tRNA.

Answer:

The E-site

Question 14: The F plasmid carries the information for

Answer:

the sex pilus.Question 15: The Ames test is useful as a rapid screening test to identify those compounds that

Answer:

are mutagens.Question 16: The diploid character of eukaryotic cells may mask the appearance of a mutation since

Answer:

the matching chromosome may carry the dominant gene.

Question 17: Which is true about prokaryotic (bacterial) RNA polymerase?

Answer:

All of the choices are true.

Question 18: Transposons

Answer:

All of the choices are correct.

Question 19: Which of the following is/are true of DNA replication?

Answer:

All of the choices are true.

Question 20: is found on the 70S ribosome.

Answer:

The A-site

Question 21: In conjugation the donor cell is recognized by the presence of

Answer:

an F plasmid.Question 22: Which change in a gene's DNA sequence would have the least effect on the eventual amino acid sequence produced from it?

Answer:

addition/deletion of 3 consecutive nucleotides Question 23: A clever technique that streamlines the identification of auxotrophic mutants is

Answer:

replica plating.Question 24: are able to take up naked DNA, occur naturally AND can be created in the laboratory.

Answer:

Competent cells

Question 25: cause single and double strand breaks in DNA molecules.

Answer:

X-rays Question 26: act during DNA synthesis AND often result in frame shift mutations.

Answer:

Intercalating agents

Question 27: Quorum sensing

3-8-2013

Answer:

is used by bacteria to sense the density of cells.