The field of evo-devo:
A. All of these options are correct.
B. examines the genetic and developmental
mechanisms of evolutionary change.
C. aims to understand the genetic differences
that underly differences in form and function
between species.
D. examines the molecular mechanisms that
guide development in individual species.
E. compares the genetic programs for growth
and development in different species.
A
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Why is it critical that the K+ channel activation gate responds slightly more slowly to depolarization than the Na+ channel activation gate?
A. If they showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes. B. If they showed identical response times, movements of Na+ and K+ ions would magnify each other's effects on membrane potential changes, creating dangerously large action potentials. C. It is not critical and there would be no change in action potential characteristics if this difference in response time did not exist.
When ?G' = 0 in a chemical reaction, under standard conditions,
A) reactants and products are at equilibrium. B) work can be done; energy is required. C) the reaction is spontaneous to the left. D) no work can be done; no energy is required. E) reactants and products are at equilibrium; no work can be done; no energy required.
During DNA sequencing, a laser beam scans the fragments on the electrophoresis gel to identify the
____________________. a. gene sequence by the color it fluoresces b. end nucleotide by the color it fluoresces c. useful DNA strands that will be analyzed further d. gene products that have been fixed by the gel e. gene products that have been sorted by the addition of a probe
Most plant cells don't contain centrioles.
Indicate whether the statement is true or false.