One of the most significant steps in the evolution of true cells from macromolecular assemblages was the evolution of:
a. electronegativity.
b. covalent bonding.
c. hydrogen bonding.
d. valence electrons.
e. molecular reproduction
e
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Which is not true of viruses?
A. They can exist in an intracellular or extracellular phase. B. They infect animal and plant cells only. C. They are acellular. D. They can be observed with an electron microscope. E. They replicate only inside host cells.
Which of the following is not potentially part
of a chromosome in eukaryotes? a. centromere. b. histone. c. sister chromatid. d. nucleosome e. all of these are part of a eukaryotic chromosome
Helicobacter pylori has been implicated as the causal agent of:
a. diarrhea. b. constipation. c. peptic ulcers. d. cardiovascular disease. e. kwashiorkor.
Papillomaviruses are transmitted by (aerosols/direct contact/secretions)
What will be an ideal response?