The dominant primary producers in tropical open ocean areas are:
a. large net phytoplankton.
b. small nanoplankton.
c. diatoms.
d. algae.
e. seaweeds.
B
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Which of the following groups contains
organisms that produce free-living larvae? a. cnidarians b. echinoderms c. arthropods d. cnidarians and echinoderms e. cnidarians, echinoderms, and arthropods
____ of the species of bacteria are pathogens.
A. All B. The majority C. About half D. A minority
Which of the following statements regarding infertility and fertilization procedures is true?
A) Embryos fertilized through assisted reproductive technologies cannot be frozen for later use, as they degrade rapidly. B) In GIFT, sperm are injected into an embryo in vitro, and the embryo is placed into the oviducts. C) In IVF, fertilization occurs in a dish. The embryo is allowed to develop for several days, and then the embryo is placed into the uterus. D) Cells cannot be removed from the blastocyst without harm to the embryo.
The molecule that an enzyme acts upon is known as its
A. substrate. B. coenzyme. C. apoenzyme. D. product. E. catalyst.