Magnetoreceptors ____
a. are well characterized and understood
b. are known to rely on the mineral magnetite
c. have been theorized to help many types of animals navigate huge distances in their annual
migrations
d. have been studied only in homing pigeons
e. have been studied primarily in moths
C
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You are studying a diploid organism that has 14 sets of chromosomes. How many chromatids would this cell have in G2 phase?
A. 7 B. 14 C. 28 D. 56
What refers to the situation in which the binding of a substrate to the enzyme causes a change in the enzyme's shape,
facilitating an enzyme's function? a. active site b. cofactor c. induced fit d. activation energy e. allosteric inhibition
As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. transversion B. frameshift C. insertion D. transition
Which of these is a function of the plasma membrane?
Maintains structural integrity of the cell Is selectively permeable to regulate movement of substances into and out of the cell Contains glycoproteins to provide recognition between cells All of these are functions