Most viruses?
A. infect only a few closely related species.
B. infect only animal cells.
C. cannot infect living cells.
D. infect only plant cells.
E. infect a wide variety of organisms.
Answer: A. infect only a few closely related species.
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Up until 20-30 years ago, people with cystic fibrosis (CF) wouldn't live long enough to reproduce
CF is a homozygous recessive condition, leading researchers to think that over time the incidence of CF would decrease because the allele would be removed from the gene pool. The results actually indicate that the rate of CF is on the rise. Which of the following would explain those results? A. We are being subjected to more mutations as a population due to more pollution. B. The population is increasing, and more people mean more mutations. C. The heterozygous condition is being selected for, much like what we see with sickle cell trait. D. People are traveling more, so when members from different areas reproduce, more mutations will result.
All the statements below are correct with one
exception. Select the exception
a. Most animals are mobile at some stage in their lives. b. Protists are the simplest of the eukaryotes. c. All known plants rely on other organisms for energy. d. All bacteria are single-celled. e. All fungi break down their food externally
The cranial cavity contains
a. the lungs and heart. b. the spinal cord. c. the brain. d. both b and c.
The branch of biology that explains both the diversity and the unity of life is ________
A) evolution B) microbiology C) taxonomy D) genetics