An infectious agent that originates from outside the body is called ________.

A. an enterotoxin
B. an exotoxin
C. exogenous
D. endogenous
E. axenic


Answer: C

Biology & Microbiology

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Amino acids are linked together by peptide bonds in a ____

A. starch. B. polypeptide. C. polysaccharide. D. nucleic acid. E. phospholipid.

Biology & Microbiology

Enzymes in living organisms typically work best near the pH of the tissues where they are found; you would predict that the pH optimum for pepsin would be near ________

a. 7 b. 2 c. 4 d. 11

Biology & Microbiology

The common house mouse species, Mus musculus, has the following taxonomic classification: Mus, Muridae, Rodentia, Mammalia, Chordata, Animalia, Eukarya. Which part of the name is the Family?

A. Muridae B. Chordata C. Animalia D. Rodentia

Biology & Microbiology

How many molecules of glucose ( molecular mass = 180 daltons) would be present in 90 grams of glucose?

a) (6.02/180) × 10^23 b) (90 x 6.02) × 10^23 c) (6.02/90) × 10^23 d) (90/180) × 6.02 × 10^23 e) 90 × 10^23

Biology & Microbiology