This tissue is found in the gut
a. A
b. B
c. C
d. D
e. E
C
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When does an atom becomes a cation?
a. It emits radiation. b. It shares electrons. c. It loses one or more electron. d. It gains one or more electron. e. One or more of its electrons changes energy levels.
Explain how dissolved sugar is transported in the phloem by means of a pressure gradient. What will be an ideal response?
A plant is exposed to a toxin that blocks ABA receptor sites in the plasma membrane. What is the likely consequence of this exposure?
A. The plant will lose excess water through transpiration and suffer dehydration. B. ABA will enter the cells by an alternative route and normal function will be restored. C. Oxygen deprivation will trigger the release of ethylene, which will in turn suppress root growth. D. Gibberellin production will increase, allowing the plant to access more nutrients in the soil. E. The guard cells will become flaccid and gas exchange will cease.
DNA consists of two antiparallel strands of nucleotides held together by
A. hydrogen bonds. B. ionic bonds. C. covalent bonds. D. peptide bonds.