All chemoautotrophs and photoheterotrophs are ____
a. archaea only
b. bacteria only
c. eukaryotes only
d. prokaryotes and eukaryotes
e. prokaryotes
ANSWER: e
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The type of movement that is specific and requires carrier molecules and energy is
A. exocytosis. B. facilitated diffusion. C. active transport. D. endocytosis. E. osmosis.
When one uses within-group differences in variables to estimate parameters in the data generating process, you are using what approach?
A. Two-stage least squares B. Within estimation C. Nonlinear least squares D. Time trends
The Human Genome Project, which got under way in 1990, is an international effort to ________
A) clone deleterious genes from humans and study their mode of action B) collect plant seeds in order to reduce the impact of human activity on plant extinction C) collect samples of cells from all parts of the world in order to preserve human genetic diversity D) clone beneficial genes from humans for eventual use in gene therapy E) determine the base sequence of the human genome and to identify all the genes within
RNA in cells differs from DNA in that ___________________
(a) it contains the base uracil, which pairs with cytosine. (b) it is single-stranded and cannot form base pairs. (c) it is single-stranded and can fold up into a variety of structures. (d) the sugar ribose contains fewer oxygen atoms than does deoxyribose.