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

Biology & Microbiology

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Among the types of microorganisms, the ________ are noncellular.

A. protozoans B. bacteria C. helminths D. viruses

Biology & Microbiology

How many types of nucleotides are found in

DNA molecules?

a. 1 b. 2 c. 3 d. 4 e. 6

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology