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.

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Some members of the Domain Bacteria have

a. a nucleus. b. membrane-bound organelles. c. chloroplasts. d. photosynthetic ability.

Biology & Microbiology

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

Biology & Microbiology