Which component of the electron-transport chain is required to combine the pair of electrons with molecular oxygen?

(a) cytochrome c
(b) cytochrome b-c1 complex
(c) ubiquinone
(d) cytochrome c oxidase


(d)

Biology & Microbiology

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What type of fertilization occurs during sexual reproduction in rotifers?

a. internal b. external

Biology & Microbiology

In the cell cycle, cells can progress from G1 to S to G2, and to mitosis and cytokinesis. The timing of these events is controlled by which of the following?

a) cyclins b) cyclin-dependent protein kinases (Cdks) c) actin myofilaments d) centrosome e) cyclin-Cdk complexes

Biology & Microbiology

Which of the following are pyrimidines found in the nucleic acid DNA?

A. adenine and guanine B. thymine and cytosine C. thymine and adenine D. uracil and guanine E. guanine and cytosine

Biology & Microbiology

A technique used to identify species by matching up sequence differences in a standard region of the genome is called

A. mutation counting. B. genome sequencing. C. DNA barcoding. D. nucleotide matching. E. PCR

Biology & Microbiology