Choose the most appropriate answer response for each question.
A. guard cells
B. sink
C. tracheids and vessel elements
D. mycorrhiza
E. nodules
F. sieve tubes
G. cuticle
H. companion cells
I. transport proteins
J. translocation
K. vessel elements
A. responsible for opening and closing of stomata
B. region of a plant where sugars are being used
C. pipelines of the xylem
D. a mutually beneficial association between a fungus and a root
E. structures on roots that house nitrogen-fixing bacteria
F. pipelines of the phloem
G. transparent epidermal secretion that waterproofs leaves
H. facilitate transfer of sugars to the sieve element
I. control the uptake of mineral ions into the vascular cylinder
J. transport of organic molecules from source region to sink
K. the main water-conducting tube in angiosperms
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What factors are required for facilitated diffusion to occur?
A. a concentration gradient B. a plasma membrane C. a transport protein D. All of the answer options are correct.
What is the directionality of the DNA molecule?
A. front to back B. top to bottom C. 5' to 3' D. 3' to 5' E. all DNA molecules are different in their directionality
Competitive inhibitors inhibit biochemical reactions in such a way as to seemingly:a
increase the concentration of substrate. b. reduce the concentration of enzyme. c. increase the concentration of enzyme. d. reduce the concentration of substrate. e. denature the enzyme.
Saxitoxin is produced by __________.
A) fungi B) bacteria C) dinoflagellates D) helminths E) protozoa