Because enzymes affect the speed of chemical reactions without being consumed, they are referred to as:
a. catalysts.
b. cytochromes.
c. activation energy.
d. hydrogen acceptors.
e. transformation proteins.
a
Biology & Microbiology
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The creeping horizontal and subterranean stems of ferns are referred to as
a. prothalli b. fronds c. stipes d. roots e. rhizomes
Biology & Microbiology
A type of multicellular animal that consists of cells with little specialization is a
A. tapeworm. B. jellyfish. C. sponge. D. bee.
Biology & Microbiology
Heartwood and sapwood consist of _____
A) periderm B) secondary xylem C) secondary phloem D) cork
Biology & Microbiology
All of the following are ways tumors avoid immune response EXCEPT ________
A) the use of endocytosis to destroy T cells B) the presence of regulatory T cells C) abnormal expression of MHC D) the use of checkpoint molecules
Biology & Microbiology