The molecule shown above is the purine ____

a. thymine
b. adenine
c. uracil
d. guanine
e. cytosine


ANSWER: b

Biology & Microbiology

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Variation in the effects of the environment on different genotypes is known as:

A. norm of reaction. B. complex variation. C. genotype-by-genotype variation. D. genotype-by-environment interaction. E. environment-by-environment variation.

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Most of the atmospheric oxygen occurs as a result of photosynthesis. From which of the following molecules is the oxygen derived?

A. NADH B. glucose C. carbon dioxide D. chlorophyll E. water

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The least common type of skin cancer mentioned in the text, but the one that must be taken most seriously, is ________

Fill in the blank(s) with correct word

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Which type of internal membrane is found lining body cavities that are open to the outside?

What will be an ideal response?

Biology & Microbiology