What would result if a leech had a mutation causing it to secrete low levels of anticoagulants?
A. The pain of the leech bite would cause the leech to be detected.
B. The blood would stop flowing after a short time.
C. The leech would have a hard time remaining attached to its host.
D. The leech would have a hard time locating appropriate hosts.
Answer: B
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What characteristic do plants, algae, and some bacteria have in common that is not shared with fungi or animals?
A. They contain mycorrhizae. B. They have spores. C. They can do photosynthesis. D. They have cell walls.
Seawater typically has an osmolarity of
a. ~5 mOsm/L. b. ~225 mOsm/L. c. ~300 mOsm/L. d. ~1000 mOsm/L. e. ~1500 mOsm/L.
What might happen if you changed one nucleotide in a codon?
A. The protein would stop being made. B. The protein would have the wrong amino acid sequence. C. There would be no effect on the protein. D. All of the above are possible.
Some forms of dwarfism in children can be treated by ____________, which is(are) made by recombinant DNA techniques.
A) insulin B) erythropoietin C) human growth hormone D) clones E) Bacillus thuringiensis