Answer the question using the accompanying figure. Which image represents the position of the Earth during the
December solstice?
a. A only
b. B only
c. C only
d. D only
e. A and C
ANSWER: c
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Bacteria living in a freshwater stream that are transferred to ocean water would
A. be in a hypotonic solution. B. be in an isotonic solution. C. become dehydrated due to the loss of water. D. gain water.
Which event occurs during the elongation stage?
A. tRNA transfers mRNA to the ribosomes. B. Free amino acids bind to the mRNA binding site. C. Anticodons bind to complementary codons. D. A stop codon enters the ribosome. E. rRNA catalyzes the formation of peptide bonds.
Individuals medically diagnosed with "dry eyes" experience feelings of dryness, itchiness, burning, and general irritation in their eyes. Dry eyes can be caused by a decreased production of tears by the tear-producing glands in the eyes. What treatment would help alleviate dry eyes?
A) stimulating production of aqueous humor B) blocking the eyelid openings used to drain tears C) stimulating production of vitreous humor
Sieve-tube elements are food-conducting plant cells that are part of the
A) xylem. B) tracheids. C) phloem. D) sclereids.