The main source of light in the deep sea is:
a. the sun.
b. bioluminescence.
c. underwater volcanoes.
d. dinoflagellates.
e. anglerfish.
B
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The ocular lens is used
a) to remagnify the image formed by the objective lens. b) as the primary lens to magnify the specimen. c) to increase the light. d) to decrease the refractive index.
Which of the following is a source of carbon skeletons that are used in the synthesis of amino acids?
A. Acetyl-CoA B. Glycolysis intermediates C. TCA cycle intermediates D. All of the choices are correct.
What is the function of the centromere?
A. to attach the DNA to the plasma membrane B. to attach the chromosome to the spindle C. to attach the sister chromatids to each other D. to organize the microtubules to form a spindle
Darwin observed that
A. organisms in a normal population differ in reproductive success. B. members of a population vary in their functional, physical, and behavioral characteristics. C. there is a constant struggle for survival of organisms. D. All of the choices are correct. E. None of the choices are correct.