In mammals, gas exchange between the air and blood takes place across the walls of the
A. diaphragm.
B. pleural membrane.
C. trachea.
D. gills.
E. alveoli.
Answer: E
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Peptide bond formation is catalyzed by an RNA molecule in
A) prokaryotes. B) eukaryotes. C) yeast only. D) cyanobacteria. E) both choices A and B
Which of the following cells are diploid?
a. sperm b. primary spermatocytes c. secondary spermatocytes d. male germ cells e. both primary spermatocytes and male germ cells
In humans, gametes are ________, while somatic cells are ________.
A. haploid, haploid B. haploid, triploid C. triploid, haploid D. haploid, diploid E. diploid, diploid
Nitrogen is a critical requirement for living organisms because it is a component of:
a. carbohydrates and lipids. b. carbohydrates. c. lipids and nucleic acids. d. nucleic acids and proteins. e. nucleic acids and carbohydrates.