Which of the following enzymes would you find in a cow's gut, but not in yours?
A. cellulase
B. pepsin
C. collagenase
D. carboxypeptidase
E. acetylcholinesterase
A. cellulase
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Among the types of microorganisms, the ________ are noncellular.
A. protozoans B. bacteria C. helminths D. viruses
How many types of nucleotides are found in
DNA molecules?
a. 1 b. 2 c. 3 d. 4 e. 6
Many fern gametophytes are hermaphrodytes, meaning they can produce both sperm and egg. Why is this necessary for a fern, but not for an angiosperm?
a. If a seed colonized a new habitat alone, it could still reproduce b. The gametophyte could produce multiple types of spores c. The gametophyte could produce multiple types of seeds d. If a spore colonized a new habitat alone, it could still reproduce e. Angiosperm gametes are already diploid
Each of the following events actually occurs. Which case would be included in the definition of sexual reproduction?
A. The female sex cell of a flower develops into a new generation after receiving the male sex cell from the same flower. B. A female sex cell develops into a new individual without fertilization. C. Three new plants develop from three branches cut from a plant and placed in potting soil. D. Twins develop.