The openings in leaves that function to
exchange gases are called
a. cuticles.
b. stomata.
c. guard cells.
d. pits.
e. pores
B
You might also like to view...
The first child conceived using IVF was born in ____
a. 1958 b. 1968 c. 1978 d. 1988 e. 1998
Although the genetic contributions of egg and sperm
nuclei are equal, the egg contributes more to cell differentiation because of a. its energy reserves. b. its cytoskeletal elements. c. its specialized proteins. d. its maternal messages. e. all of these.
As the concentration of an enzyme increases for a given substrate,
A. the reaction rate increases similarly. B. the turnover number decreases at the same rate that the enzyme concentration increases. C. the rate of the reaction decreases to a point. D. there is no change in the reaction.
Regarding the trp operon, trpR? maps to a considerable distance from the structural genes. The mutation either inhibits the interaction with tryptophan or inhibits repressor formation entirely. In the presence of tryptophan in the medium, would you
expect the trp operon to be transcriptionally active? Explain. What will be an ideal response?