Van Leeuwenhoek described microorganisms as:
a. animalcules
b. prokaryotes
c. eukaryotes
d. protozoa
Ans: a. animalcules
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If you applied a toxin that blocked non-voltage-gated potassium channels (i.e., the potassium "leak channels") in a resting neuron, it would cause the membrane potential to be
A. less negative. B. more negative. C. No change would be observed.
Drift nets are allowed to float overnight in open ocean areas
Indicate whether the statement is true or false
Which factor is the most important algal contribution to the fungal component of a lichen?
a. improved water conservation b. mechanical protection c. photosynthetically derived food d. conversion of nitrogen gas to nitrates e. pigment for camouflage
If the DNA nucleotides read ATG-CGT-GAC, the
amino acid sequence of the resulting polypeptide would be a. tyrosine – alanine – leucine. b. methionine – arginine – asparagines. c. histidine – glycine – praline. d. serine – lysine – glycine. e. all of these.