The urinary system helps to maintain the
extracellular fluid pH by
a. synthesizing buffers.
b. retaining carbon dioxide in the filtrate.
c. excreting excess hydrogen ions.
d. combining hydrogen ions with urea.
e. signaling the respiratory system to adjust
breathing rate.
Answer: c
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Pregnancy can cause which of the following abnormal curvatures of the back?
A) scoliosis B) kyphosis C) lordosis D) All of the answers are correct. E) None of the answers are correct.
Which variable is likely to undergo the largest change in value resulting from a mutation that introduces a new allele into a population at a locus for which all individuals formerly had been fully homozygous?
A) average heterozygosity B) nucleotide variability C) geographic variability D) average number of loci
RNA viruses replicate in the:
a. Cytoplasm b. Mitochondrion c. Endoplasmic reticulum d. Ribosomes e. Nucleus
The fact that RNA can catalyze reactions necessary for replication gave rise to:
a. microspheres. b. biodiversity. c. protein synthesis. d. the RNA world hypothesis. e. the Urey-Miller experiment.