Which of the following is the light-absorbing compound used by photoreceptors?

A. opsin
B. retinal
C. rhodopsin
D. both opsin and retinal


B

Biology & Microbiology

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Logistic growth of a population is represented by dN/dt = _____

A) B) rmax N C) rN (K + N) D) rN E) rNrN

Biology & Microbiology

Based on the figure, which of the following is true of HIV?


A. It uses reverse transcriptase from the cell to make DNA.
B. It replicates in the nucleus of cells.
C. It contains DNA as its genetic material.
D. It is an enveloped virus.
E. It lyses cells when it is released.

Biology & Microbiology

In the figure above, the two DNA molecules

produced when step "d" is completed will be

a. identical to the parent DNA but not to each other. b. complementary to each other but not to the parent DNA. c. different from each other and the parent DNA. d. identical to each other and complementary to the parent DNA. e. complementary to each other and complementary the parent DNA

Biology & Microbiology

What environmental challenge is posed to young plants by an old growth forest?

A. high temperatures B. thick leaf litter C. low light D. low humidity

Biology & Microbiology