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LSC 347, Exam #4 Chapter 16 Questions & Answers
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LSC 347, Exam #4 Chapter 16 The enzyme permease cleaves the linkage between glucose and galactose residues in lactose. - Answer- False Under a system of negative control, genetic expression occurs unless such expression is shut off by some form of regulator. - Answer- True The trp and lac ...

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  • October 26, 2024
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  • 2024/2025
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LSC 347, Exam #4 Chapter 16
The enzyme permease cleaves the linkage between glucose and galactose residues
in lactose. - Answer- False

Under a system of negative control, genetic expression occurs unless such
expression is shut off by some form of regulator. - Answer- True

The trp and lac operons are both subject to forms of control that are typically called
negative. - Answer- True

What term would be applied to a regulatory condition that occurs when protein is
associated with a particular section of DNA and greatly reduces transcription? -
Answer- negative control

When a metabolic block occurs in a biochemical pathway, it is common for amount
of the substance immediately prior to that block to increase. - Answer- True

Under a system of positive control, transcription does not occur unless a regulator
molecule directly stimulates RNA production. - Answer- True

The ara operon is controlled by a regulator protein that exerts ________. - Answer-
positive and negative control

Which term most appropriately refers to a regulatory protein in prokaryotes? -
Answer- DNA binding protein

In the lac operon, the product of structural gene lacZ is capable of ________. -
Answer- splitting the -linkage of lactose

The ribonucleic acid components known to exist in eukaryotic ribosomes are the
following: 5.8S, 18S, 28S, and 5S. - Answer- True

A class of mutations that results in multiple contiguous amino acid changes in
proteins is likely to be which of the following? - Answer- frameshift

The trp operon is typically characterized as being both under negative control and
repressible. - Answer- True

Although mutation is the original source of genetic variation, its influence on
changing allelic frequencies is relatively minor. - Answer- True

When referring to attenuation in regulation of the trp operon, it would be safe to say
that when there are high levels of tryptophan available to the organism, ________. -
Answer- transcriptional termination is likely

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