Cardiac glycosides, molecules causing a drastic effect on vertebrate heart function, are produced as defensive chemicals by plants belonging to
A. the milkweed and dogbane families.
B. the mustard family.
C. the grass family.
D. the poison ivy, oak, and sumac families.
E. the bean family.
A. the milkweed and dogbane families.
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Chemotherapeutic agents that are chemically modified natural products of microorganisms are most specifically referred to as ________.
A. semisynthetic drugs B. antimicrobial agents C. antibiotics D. synthetic drugs
All of the following are consistent with the law of conservation of matter EXCEPT:
a. there is no such thing as waste. b. matter is neither created nor destroyed but it can change form. c. any matter that is dangerous to living things is quickly biodegraded into a harmless form. d. one organism's waste matter is taken up by another organism and reused.
A true-breeding red rose is repeatedly mated with a true-breeding white rose, and all of their offspring are red. If two of these red offspring are mated, what percentage of their offspring will be red?
a. 60% b. 75% c. 100% d. 25% e. 50%
Which of the following might decrease the transcription of only one specific gene in a bacterial cell?
(a) a decrease in the amount of sigma factor (b) a decrease in the amount of RNA polymerase (c) a mutation that introduced a stop codon into the DNA that precedes the gene's coding sequence (d) a mutation that introduced extensive sequence changes into the DNA that precedes the gene's transcription start site