A double-ring nitrogenous base found in DNA and RNA
What will be an ideal response?
Guanine (G)
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Because the two strands of a DNA molecule are ________ to each other, either one can be used as a template to reconstruct the other.
A. identical B. antiparallel C. bound D. complementary
Excreting ammonia directly into the environment (select all correct choices):
A. is energetically inexpensive. B. requires high volumes of water. C. is energetically expensive. D. requires little water. E. converts it into a less toxic form.
Which of the following statements about B cells is true?
A. B cells change into plasma cells after encountering an antigen and then produce antibodies. B. B cells carry receptor molecules on their cell surfaces. C. Some B cells become memory cells. D. B cells develop and mature in the bone marrow. E. All of the answer choices are correct.
Wood is an accumulation of
A. bark. B. phloem. C. fruit. D. xylem.