The molecule shown above is the purine ____
a. thymine
b. adenine
c. uracil
d. guanine
e. cytosine
ANSWER: b
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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.
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
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
Which type of internal membrane is found lining body cavities that are open to the outside?
What will be an ideal response?