Which group has the highest concentration of urea in their body fluids?
A. cartilaginous fishes
B. marine bony fishes
C. birds
D. freshwater bony fishes
E. reptiles
Answer: A
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Many antibiotics work by inhibiting the synthesis of petidoglycan, a component of the bacterial cell wall. What is a possible mechanism of action for anti-fungal drugs?
A. inhibiting the synthesis of peptidoglycan in fungi B. inhibiting the synthesis of cellulose in fungi C. inhibiting the synthesis of chitin in fungi D. inhibiting the synthesis of lignin in fungi
Which of the following enzymes digests fats?
a. pepsin b. catalase c. amylase d. lipase e. trypsin
The enzyme found in tears that can digest bacterial cell walls is called:a
protease. b. lysozyme. c. interferon. d. cytokine. e. defensin
Cardiac glycosides, molecules causing a drastic effect on vertebrate heart function, are produced as defensive chemicals by plants belonging to
A. the mustard family. B. the bean family. C. the grass family. D. the milkweed and dogbane families. E. the poison ivy, oak, and sumac families.