A marked seasonality to a disease is often indicative of
A) certain modes of transmission.
B) the presence of carriers.
C) a zoonotic infection.
D) a bacterial disease.
Answer: A
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An adenovirus
a. is a naked virus. b. does not have a lipid envelope. c. has a spiked protein coat. d. infects animals. e. all of these.
Crossing over occurs during ________ and is important because it ________
A) telophase II; creates daughter cells B) prophase I; generates variation C) anaphase II; separates the homologous pairs D) metaphase I; reduces the chromosome number by half
Which of the following is similar between erythrocytes and lymphocytes?
a. They are both components of the plasma. b. They both have roles in immune response. c. They are both produced from stem cells. d. They both carry hemoglobin.
Why is sexual reproduction most likely the ancestral state in eukaryotes?
a. Asexual reproduction is completely absent from basal unicellular eukary-otes. b. Under the parsimony principle, the most common form of a trait's state is always the ancestral state. c. The "twiggy" distribution of obligate asexual reproduction in phylogenetic trees makes it more likely that asexuality is a derived trait. d. Evolutionary models suggest that obligate asexual taxa are more prone to extinction than sexual ones.