Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
A. guanine.
B. cytosine.
C. thymine.
D. uracil.
E. adenine.
A. guanine.
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Which of the following is NOT a trait shared between green algae and land plants?
a. stomata b. chloroplasts with chlorophyll a c. cellulose in their cell walls d. store energy captured during photosynthesis as starch e. chloroplasts with chlorophyll b
DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that
A. convergent evolution led to the DNA similarities. B. humans evolved from chimpanzees. C. humans and chimpanzees share a relatively recent common ancestor D. humans and chimpanzees are not closely related. E. chimpanzees evolved from humans.
Tunde is worried that she has diabetes since a lot of her family has it. Which of the following blood findings would set her mind most at ease?
A) 400 mg/dl glucose B) 90 mg/dl glucose C) 30% Hb A1c hemoglobin D) 9% Hb A1c hemoglobin
The layer of the digestive tract that contains smooth muscle is the ________
Fill in the blank(s) with correct word