Which statement is a characteristic of plasmids?
A) They do not replicate independently of the bacterial chromosome.
B) They can be used to create recombinant DNA.
C) They are very difficult to move out of and into bacterial cells.
D) They are attached to bacterial chromosomes.
Answer: B
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In the transport model shown below, what is the exchange rate of Na+ for K+?
a. They are traded evenly across the membrane.
b. Two Na+ are exchanged for every single K+.
c. Three Na+ are exchanged for each two K+.
d. This model is not transporting the ions at all.
What structures allow water to move laterally and vertically through xylem cells?
a. sieve elements b. companion cells c. sclereids in the cell walls d. pits in the cell walls e. perforated sieve plates
The Casparian strip is associated with the
a. epidermis. b. vascular tissue. c. cortex. d. root hairs. e. endodermis
In the accompanying figure, the palisade mesophyll is labeled with the number
:
a. 1
b. 2
c. 3
d. 6
e. 9