Veins always carry blood:
A) away from the lungs. B) toward the heart.
C) toward the capillaries. D) away from the heart.
Answer: B
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Milkweed plants produce a variety of defenses (such as leaf hair and latex-filled canals) to deter herbivores. How can monarch caterpillars circumvent these obstacles? Select all correct choices
A. by mowing hairs off of milkweed leaves B. by cutting the midvein that transports latex through leaves C. by creating channels to divert the flow of latex D. by metabolizing chemical compounds (cardenolides) produced by milkweeds
A three-base sequence, found on the bottom loop of tRNA, that is complementary to a sequence of three bases in mRNA is a(n)
A. terminator. B. amino acid attachment site. C. promoter. D. codon. E. anticodon.
Which of the following may trigger a migraine headache?
a. hormonal changes b. fluorescent lights c. certain foods d. weather changes e. all of these
Which of the following is not a function of an antibody?
A) activate complement cascade B) attract phagocytes C) stimulate helper T cells D) neutralize toxins