Lactate production in muscle cells is
a. temporary.
b. due to oxygen deficiency.
c. an NAD+ regenerator.
d. temporary and due to oxygen deficiency.
e. temporary, due to oxygen deficiency, and an
NAD+ regenerator.
Answer: e
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Plant behaviors are not always easily observed because they:
A. may occur at short intervals B. are mostly internal to the plant C. are mostly caused by internal organisms D. are not observable by the human eye E. are only observable with a microscope
__________ moves food down the esophagus and
through a __________ (a ring of muscle that can close off an opening) into the stomach. Fill in the blank(s) with the appropriate word(s).
Fixation of carbon is accomplished by:
a. photosynthetic organisms. b. primary consumers. c. decomposers. d. bacterial decomposers. e. burning of organic matter
Which of the following shows the correct linkage of amino acids in a protein?
A. amino group of one bonded to the amino group of the next B. acid group of one bonded to acid group of the next C. acid group of one bonded to amino group of the next D. All of these answers are correct.