The cell _____ can be composed of three layers: the membrane, the cell wall, and the outer membrane.

A. glycocalyx
B. envelope
C. pathogenic package
D. slime coat
E. None of the choices is correct.


Ans: B. envelope

Biology & Microbiology

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An anticodon

(a) is a three-base sequence of nucleotides on tRNA. (b) is produced by translation of RNA. (c) has the same base sequence as does the codon. (d) is the same as a gene.

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Adenine and thymine form _______ hydrogen bonds between them, while cytosine and guanine form _______ bonds

A. 2 , 3 B. 3 , 4 C. 3 , 2 D. 4 , 3

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Aerobic respiration in plants occurs

a. continually. b. only in the daytime. c. only at night. d. sporadically

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Systolic pressure measures

a. the contracting force of the ventricles. b. the pressure of fully relaxed ventricles. c. the contracting force of the atria. d. the pressure of fully relaxed atria. e. the contracting force of the entire heart

Biology & Microbiology