Question

QUESTION 36 What is the role of a molecule that controls a repressible operon? increase the production of inactive repressor proteins bind to the repressor protein and deactivate it bind to the repressor protein and activate it bind to the operator region and block the attachment of RNA polymerase to the promoter bind to the promoter region and decrease the affinity of RNA polymerase for the promoter QUESTION 37 When it acts upon a gene, which of the following processes consequently makes that gene an accurate molecular clock? mutation reverse transcription proofreading directional natural selection transcription QUESTION 38 Whenever diploid populations are in Hardy-Weinberg equilibrium at a particular locus, natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. this means that, at this locus, two alleles are present in equal proportions. the population itself is not evolving, but individuals within the population may be evolving. the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. QUESTION 39 Which of the following are problematic when the goal is to construct phylogenies that accurately reflect evolutionary history? monophyletic taxa paraphyletic taxa polyphyletic taxa polyphyletic and paraphyletic taxa

          QUESTION 36
What is the role of a molecule that controls a repressible
operon?
increase the production of inactive repressor proteins
bind to the repressor protein and deactivate it
bind to the repressor protein and activate it
bind to the operator region and block the attachment of RNA
polymerase to the promoter
bind to the promoter region and decrease the affinity of RNA
polymerase for the promoter

QUESTION 37
When it acts upon a gene, which of the following processes
consequently makes that gene an accurate molecular clock?
mutation
reverse transcription
proofreading
directional natural selection
transcription

QUESTION 38
Whenever diploid populations are in Hardy-Weinberg equilibrium
at a particular locus,
natural selection, gene flow, and genetic drift are acting
equally to change an allele's frequency.
this means that, at this locus, two alleles are present in equal
proportions.
the population itself is not evolving, but individuals within
the population may be evolving.
the allele's frequency should not change from one generation to
the next, but its representation in homozygous and heterozygous
genotypes may change.

QUESTION 39
Which of the following are problematic when the goal is to
construct phylogenies that accurately reflect evolutionary
history?
monophyletic taxa
paraphyletic taxa
polyphyletic taxa
polyphyletic and paraphyletic taxa

Added by Samantha V.

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