Arrange the following steps of mammalian inspiration (inhalation) in the proper sequence.
A. Step 1
B. Step 3
C. Step 4
D. Step 2
A. Diaphragm contracts and moves down.
B. Thoracic cavity expands and thoracic pressure decreases.
C. Air flows into the lungs.
D. Rib cage moves up and out.
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Reverse transcriptase is a(n)
A) RNA-dependent DNA polymerase. B) DNA-dependent DNA polymerase. C) RNA-dependent RNA polymerase. D) DNA-dependent RNA polymerase.
When nitrate is used as a final electron acceptor by bacteria growing in anoxic soils, the nitrogen is no longer available for the construction of precursor metabolites. This is referred to as
A. dissimilatory nitrate reduction. B. nitrogen respiration. C. nitrogen fixation. D. nitrification.
Sex chromosomes
a. determine gender. b. vary from one sex to another. c. carry some genes that have nothing to do with sex. d. were unknown to Mendel. e. are all of these.
Four of the five answers listed below are sources of variation in a population. Select the exception
a. mutation b. sexual reproduction c. crossing over d. independent assortment e. law of dominance