The energy source that may have driven the chemical reactions leading to modern Earth's atmosphere was ____
a. sunlight
b. electrical storms (lightning)
c. photosynthesis
d. radioactive decay
e. heat energy released from Earth's core
ANSWER: b
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Ribosomes that do not anchor on the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the surface. C) have a signal peptidase error. D) do not make the appropriate anchor protein. E) all of the above
The chi-squared statistic can best be described as
A) the standardized deviation of observed data from expected data. B) a statistically significant test. C) a statistical test used in genetics. D) a statistical test that compares observed and expected population means. E) None of these
Some protists possess cilia and flagella. Cilia and flagella share a common organizational structure. If a protist possesses both cilia and flagella, is it more likely to have a greater number of cilia or a greater number of flagella?
A) Cilia B) Flagella
Glycoproteins in the plasma membrane that identify self and help the body defend itself against pathogens.
What will be an ideal response?