B and T cells become activated and divide to produce identical cells when _____
a. activated by an antigen
b. major histocompatibility genes are expressed
c. activated by the presence of cancerous cells
d. plasma cells begin to produce and secrete antibodies
e. killer T cells bind to any pathogen
a
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Enzymes in the body catalyze biochemical reactions and ____
a. are chemically changed at the end of the reaction b. are destroyed at the end of the reaction c. are processed into substrate molecules d. convert substrate molecules into products e. convert products into substrate molecules
________ is attached to a specific amino acid and transports it to the appropriate region of mRNA
Fill in the blank(s) with correct word
Which of the following, if discovered, could refute our current understanding of the pattern of evolution?
A) no fossils of soft-bodied animals B) a modern bird having reptile-like scales on its legs C) radioactive dating of rocks showing that rocks closer to the Earth's surface are younger than lower rock strata D) diverse fossils of mammals in Precambrian rock
Radiation exposure that occurs through the body is MOST appropriately termed:
A) infection. B) absorption. C) irradiation. D) internal contamination.