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
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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.
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
All land plants produce a protected embryo during their reproductive cycle
1.True 2.False
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.