A human egg is approximately 100 mm, or ____ mm, in diameter
a. 0.10
b. 10.0
c. 0.010
d. 0.0010
e. 1.0
ANSWER: a
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The initial infective stage of the malarial parasite is the
A) sporozoite. B) merozoite. C) schizont. D) plasmodyite.
Answer the following statements true (T) or false (F)
1. Because they differ from other living organisms by lacking a discrete nucleus and many other cell inclusions, bacteria and archaea are more closely related to one another than they are to eukaryotes. 2. Archaea that tolerate and/or require high salinities are called halophiles. 3. Various anaerobic archaea that convert carbon dioxide and other carbon-bearing compounds into methane are called methanotrophs. 4. Type IV secretion systems are potentially applicable to treatment of human disease by using them to deliver DNA to target cells in human gene therapy.
The size of DNA is often given in the number of ________ that it contains.
A. triplets B. genes C. base pairs D. proteins E. codons
The data below suggest that the proportion of sexuals in snails increases with parasite load. Is this the only possible explanation for the observed differences in the degree of sexual reproduction?
a. Yes, the data points show a clear correlation between parasite load and sexual reproduction. b. Yes, factors other than parasites are unlikely to fine-tune the degree of sexual reproduction in natural populations. c. No, lakes and streams differ in their average parasite load. d. No, habitat differences between lakes and streams may be responsible for different levels of sexual reproduction.