Sugars leave the source region and immediately enter into a ____, followed by direct movement into the ____
a. pit, perforation plate
b. companion cell; sieve element
c. pit, vessel element
d. plasmodesmata, sink
e. phloem tube, companion cell
b
You might also like to view...
Adaptive immunity occurs when
A) death results from pathogen infection. B) the innate immune response fails to eliminate pathogens in the body. C) virulent pathogen infections persist in the body after the initial innate defense response. D) the innate immune response fails to eliminate pathogens in the body and virulent infections persist after the initial innate defense response.
Martin Pollak studies kidney disease in humans. Why does he use human subjects in his research, instead of animal
models?
a. He can perform invasive experiments on humans. b. He can carry out planned matings in humans. c. Humans have a long generation time. d. He can examine renal phenotypes in conjunction with genetic analyses. e. He can genetically manipulate his patients.
The most vulnerable organisms to the effects of DDT
are a. producers. b. herbivores. c. primary carnivores. d. decomposers. e. top carnivores.
The function of chymotrypsin is to:
A) synthesize proteins. B) break down proteins into amino acids. C) synthesize glycogen. D) break down glycogen into glucose.