The "age of fishes" was the _____ period.
A. Ordovician
B. Silurian
C. Carboniferous
D. Permian
E. Devonian
E. Devonian
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If a cross of two traits shows a 9:3:3:1 ratio, you know the organism was what?
A. Both heterozygous B. Both homozygous C. One of each
Eukaryotic cells manufacture cytoskeletal proteins, which help to maintain cell shapes and functions. What would you predict about these proteins?
A) They initially contain signal sequences that allow their entrance into the endoplasmic reticulum. B) They are manufactured on free ribosomes in the cytoplasm. C) They are glycosylated in the Golgi apparatus. D) They travel to the nucleus in a transport vesicle with a specific signal.
The accompanying figure is the product of a:
a. phase-contrast light microscope.
b. Nomarski differential interference microscope.
c. transmission electron microscope.
d. scanning electron microscope.
e. confocal fluorescence microscope.
In precipitation tests, maximum precipitation takes place when
A) the amount of the antibody exceeds the amount of the antigen. B) the amount of the antigen exceeds the amount of the antibody. C) the amount of the antibody and the amount of the antigen are at optimal proportions. D) a toxin is present. E) a complex solution of many antibodies is used.