The readout recorded in Pavlov's experiments on learning and feedforward regulation was:
A. how long the metronome ticked.
B. amount of saliva collected.
C. how quickly the dogs ate.
D. amount of food the dogs ate.
Answer: B
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Insertions and deletions of three base pairs:
A. change one codon and, therefore, only one amino acid in the protein sequence. B. do not disrupt the reading frame so the protein ends up completely normal. C. do not disrupt the reading frame so the protein will usually retain some degree of function. D. cause frameshifts that will change the reading frame and, therefore, the sequence of the protein. E. usually result in the expression of a truncated protein.
During which phase of the cell cycle do chromosomes separate and move toward opposite poles?
a. prophase b. metaphase c. anaphase d. telophase
In transcription, the base thymine in DNA will pair opposite the base ____ in mRNA.
A. uracil B. guanine C. cytosine D. adenine
Which of the following statements is not true?
A. A cell will temporarily decondense its chromatin to give proteins rapid, localized access to specific DNA sequences. B. When a cell divides, its chromatin structures will typically be inherited by its daughter cells. C. A cell can permanently condense and silence an entire chromosome during development. D. A cell will temporarily decondense its chromatin to silence genes during differentiation. E. A cell will temporarily decondense its chromatin to allow access to specific DNA sequences for replication, repair, or gene expression.