Vertebrates with external fertilization produce eggs that (select all correct choices):
A. have a yolk to provide nutrients to the
developing embryo.
B. obtain oxygen via diffusion from the
environment.
C. eliminate wastes via diffusion into the
environment.
D. obtain water via diffusion from the
environment.
E. are laid on or near substrates like rocks to
A,B,C,D,E
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The killing of cells by UV irradiation involves
A) absorption at 260 nm by proteins only. B) absorption at 260 nm by RNA only. C) formation of pyrimidine dimers. D) formation of purine dimers.
Which of the following are NOT structures by which viruses adhere to their host cells?
a. Capsule b. Spikes c. Fimbriae d. Slime layer
Which of the following is a DNA palindrome?
a) 5'GAAATTTC-3' b) 5'ACGTACGT-3' c) 5'AATTTTAA-3' d) 5'AAAATTTT-3' e) All of the above are palindromes
The subatomic particles that surround the nucleus are the
A. protons. B. protons and neutrons. C. protons and electrons. D. electrons. E. neutrons.