Why was it not possible to classify viruses by morphology when they were initially discovered?
a. Initially, their morphology could change during infections.
b. Once inside the host, they replicate too quickly to be inspected for discernable shape.
c. They are too small to be seen with a standard microscope.
d. So many of them have identical morphology but different hosts and modes
c. They are too small to be seen with a standard microscope.
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Which of the following can directly participate in creating the binding specificity of an enzyme active site? Choose all that apply
A. hydrophobic amino acid side chains B. hydrophilic amino acid side chains C. alpha helical regions of the polypeptide D. beta-sheet regions of the polypeptide E. negatively charged amino acid side chains F. positively charged amino acid side chains
Sister chromatids detach from one another and
become visibly separate chromosomes during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase
Researchers studying groupies in Trinidad found that guppies in streams with high predation reproduced earlier and more frequently. Which of the following is most important in driving the guppies to change their life history in face of predation?
A. The guppies are an equilibrium species. B. The guppies are an opportunistic species. C. Density-independent factors affects the guppy populations. D. Density-dependent factors affects the guppy populations. E. Sexual selection affects the guppy populations.
The control of an organism's body temperature is
What will be an ideal response?