The nucleoside triphosphate molecules in DNA are linked together in the 5'?3' by a(n) ________ bridge.
A) phosphate
B) covalent
C) phosphodiester
D) peptide
E) phosphatidyl
C) phosphodiester
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Microorganisms assimilate large amounts of all of the following except ________ into organic molecules.
A. sodium B. phosphorus C. nitrogen D. sulfur
If a toxin blocks the receptors for the neurotransmitter on the postsynaptic muscle cell,
____________________.
a. paralysis will occur b. the person will have a seizure c. the action potential in the presynaptic cell fails d. calcium, which can function as a neurotransmitter, will be released
What should the tonicity of the distilled water be compared to body cells?
a. It should be isotonic to the cells. b. It should be hypotonic to the cells. c. It should be protonic to the cells. d. It should be hypertonic to the cells.
Scorpions have a prosoma, pedipalps that are modified into claws, and chelicerae. Which taxonomic group are they a member of?
A. Myriapoda B. Crustacea C. Hexapoda D. Chelicerata