Crossing-over occurs between
a. sister chromatids of the same chromosome.
b. chromatids of nonhomologous chromosomes.
c. nonsister chromatids of a homologous pair.
d. None of these are correct.
c. nonsister chromatids of a homologous pair.
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The photosystem channels the excitation energy gathered by absorption of light by any one of the pigment molecules to a specific reaction center chlorophyll, which in turn passes the energy to
A. photosystem I. B. photosystem II. C. the primary electron acceptor. D. the secondary electron center. E. cytochrome.
If the codon consisted of only 2 nucleotides
there would be how many possible codons?
a. 4 b. 8 c. 16 d. 32 e. 64
Some members of the Domain Bacteria have
a. a nucleus. b. membrane-bound organelles. c. chloroplasts. d. photosynthetic ability.
Which lineage includes living members associated with adaptations such as squalene, spiral valve, electroreceptors, lateral line system, and claspers?
a. Actinopterygii b. Petromyzontoidea c. Chondrichthyes d. Sarcopterygii