During muscular contraction, cross-bridges form between _____ and _____ .

A. actin, myosin
B. actin, tropomyosin
C. myosin, troponin
D. myosin, tropomyosin
E. troponin, calmodulin


A. actin, myosin

Biology & Microbiology

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Put the following steps of the HIV life cycle in order:1.Viral

RNAs and proteins assemble into new viral particles that bud from the cell. 2.DNA copy of the viral genome is integrated into the host genome. 3.Viral reverse transcriptase makes a DNA copy of the viral RNA genome. 4.Viral particle enters the cell. 5.The provirus is transcribed into viral RNA genomes and mRNAs to make viral proteins.

a. 3,2,5,1,4 b. 2,3,4,5,1 c. 4,2,3,1,5 d. 2,4,3,5,1 e. 4,3,2,5,1

Biology & Microbiology

All land plants produce a protected embryo during their reproductive cycle

1.True 2.False

Biology & Microbiology

Comprehension TOP: MAKING NEW RED BLOOD CELLS

26. On average, an adult male's red blood cell count is around a. 5.4 million per cubic millimeter. b. 3.6 million per cubic millimeter. c. 4.8 million per cubic millimeter. d. 6.0 million per cubic millimeter. e. 7.1 million per cubic millimeter.

Biology & Microbiology

The enzyme used by retroviruses to make a DNA copy of their RNA genome is called

A. RNA polymerase. B. reverse transcriptase. C. DNA polymerase. D. RNA replicase.

Biology & Microbiology