How does resistance to drugs spread in bacterial populations?
A) Exposure to drugs causes mutations in bacterial genes.
B) Horizontal gene transfer between bacteria spreads R (resistance) plasmids.
C) Genetic recombination during sexual reproduction.
D) Exposure to drugs induces immunity.
E) Exposure to drugs alters gene expression in bacteria.
B
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In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total number of
shared electrons in CH4 is ____.
a. 1 b. 2 c. 4 d. 5 e. 8
In the female, the ____ acts as a temporary endocrine gland and secretes ____
a. pituitary; LH and FSH b. corpus luteum; estrogen and progesterone c. ovaries; estrogen and LH d. endometrium; estrogen and FSH e. uterus; LH and FSH
Consider a plant where a multicellular generation is able to make both sperm and eggs. Which of the
following terms would describe such a plant?
a. homosporous b. bryophyte c. heterosporous d. lycophyte e. haploid/diploid
Modern humans evolved about
a. 200,000 years ago. b. 2,000,000 years ago. c. 2,000,000,000 years ago. d. 4,600,000,000 years ago.