__________ are the functional units of heredity, and they code for specific __________
a. DNA; genes
b. Genes; proteins
c. Proteins; genes
d. Nucleotides; DNA
B
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The Sec system is used by
A. both Gram-positive and Gram-negative bacteria. B. neither Gram-positive nor Gram-negative bacteria. C. Gram-negative bacteria only. D. Gram-positive bacteria only.
The ciliary muscle
a. controls the eardrum. b. controls the shape of the lens to allow focusing. c. holds the bones of the middle ear in place. d. enables the eyeball to move so that a person may see an object without moving the head. e. is responsible for the size of the pupil in different light intensities.
Which of the following is not a product of fermentation?
A) lactate B) CO2 C) ethanol D) NAD+ E) glycogen
Bonds between two atoms that are equally electronegative are _____
A) hydrogen bonds B) polar covalent bonds C) nonpolar covalent bonds D) ionic bonds