What type of genetic material did scientists use to track gene flow in a current population of wildebeest?
A. Chromosomal DNA
B. Mitochondrial DNA
C. Y-chromosomal analysis
D. Ribosomal RNA
E. Messenger RNA
Answer: B
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The simplest viruses consist of
A. RNA only. B. Protein only. C. RNA or DNA in a protein coat. D. RNA or DNA in a protein coat covered with lipid envelope. E. RNA, DNA and enzymes in a protein coat with a lipid envelope.
What do the cell walls of plants and the extracellular matrix of animal cells have in common?
A) They are largely composed of phospholipids and glycoproteins. B) Their proteins are made by free cytoplasmic ribosomes. C) They form rigid structures that provide structural support for cells but limit their expansion. D) They limit the passage of small molecules. E) They have functional connections with the cytoskeleton inside the cell.
Antiviral drugs are often difficult to develop, largely because
A. viruses are more abundant in the body than bacterial cells. B. viruses are obligate intracellular parasites so the drugs must enter the host cell and often cause toxic side effects in order to destroy the virus. C. viruses are more pathogenic than bacterial cells. D. viruses are much smaller than bacterial cells.
All crocodilians
a. live in or near water. b. are predators with sharp teeth. c. have a four-chambered heart. d. show parental behavior. e. fit all of these descriptions.