Which of the following statements about parasitic helminths is incorrect?
A. They are multicellular animals.
B. They have a definitive host in which the adult form lives.
C. They include roundworms and tapeworms.
D. They have larval forms that do not affect humans.
Answer: D
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A __________ is a chemical messenger that binds to receptors on a cell and brings about
metabolic, physiological, or behavioral responses in the organism.
a. hormone b. enzyme c. nucleus d. growth factor
photosynthesis releases _______________________.
What will be an ideal response?
Within a double-stranded DNA molecule, adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanine. This arrangement _____
A) allows variable width of the double helix B) permits complementary base pairing C) determines the tertiary structure of a DNA molecule D) determines the type of protein produced
EcoRI and HindIII are
A. DNA polymerases. B. restriction endonucleases. C. ligases. D. reverse transcriptases. E. palindromes.