You and your neighbor have how much difference in your DNA sequence?
A) 0.01%
B) 0.1%
C) 1%
D) 10%
E) 25%
B) 0.1%
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During the first major divergence of life, the atmosphere was ____
a. high in oxygen, high in carbon dioxide b. high in hydrogen, low in oxygen c. changing from anaerobic to aerobic d. firmly in the age of aerobes e. high in oxygen, low in carbon dioxide
Highly acidic gastric secretions are kept from leaking out of the stomach by
a. desmosomes. b. tight junctions. c. adhering junctions. d. gap junctions. e. intercalated discs.
Activated B cells divide to form plasma cells and memory B cells, both of which are short-lived and secrete copious
amounts of antibody molecules into the bloodstream. a. True b. False
Define the term 'gene pool'.a.
a. local group of individuals belonging to the same species, which are actually or potentially interbreeding b. the total of all alleles possessed by reproductive members of a population c. the proportion of individuals in a population carrying a particular allele d. the proportion of individuals in a population having a particular genotype