Which area of biology is concerned with studying
gene maps, looking for similarities and differences
that point to evolutionary connections?
a. structural genomics
b. Darwinian genomics
c. phylogenetic genomics
d. comparative genomics
e. classical genomics
Answer: d
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Choanoflagellates are single-celled eukaryotes that feed on bacteria. The presence of their food bacteria causes these cells to cluster into multicellular structures in which the individual choanoflagellate cells are attached to one another
Based on this observation, it may be assumed that: A. the bacterial cells, or a chemical released by the bacteria, bind to a receptor on the plasma membrane of the choanoflagellate cells. B. the choanoflagellate cells use cadherins to attach to each other. C. the choanoflagellates use integrins to attach to each other. D. choanoflagellates are complex multicellular organisms because they alternate between single cell and multicellular states.
Which of the following is associated with striated, multinucleated muscle tissue?
A. cardiac muscle cell B. calmodulin C. skeletal muscle cell D. smooth muscle cell
In the lac operon, CAP binding to the CAP site of the promoter ____
a. occurs when glucose is present b. inhibits RNA polymerase from binding to the promoter c. occurs when cAMP is absent d. helps the repressor protein bind to the operator e. enables RNA polymerase to transcribe the operon’s genes
Which nucleotide forms the tail of a completed
messenger RNA transcript?
a. adenine b. thymine c. cytosine d. guanine e. a combination of more than one of these