Which of the following is associated with retrograde movement?

A) dynein
B) actin
C) tubulin
D) myosin
E) kinesin


A) dynein

Biology & Microbiology

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Most of the energy used by humans comes from which one of the following sources?

A) solar energy B) nuclear energy C) fossil fuels D) hydroelectric power E) geothermal power

Biology & Microbiology

The thermoacidophile Sulfolobus acidocaldarius lacks peptidoglycan, but still possesses a cell wall. What is likely to be true of this species?

1. It is a bacterium. 2. It is an archaean. 3. The optimal pH of its enzymes will lie above pH 7. 4. The optimal pH of its enzymes will lie below pH 7. 5. It could inhabit certain hydrothermal springs. 6. It could inhabit alkaline hot springs. A) 1, 3, and 6 B) 2, 4, and 5 C) 1, 3, and 5 D) 1, 4, and 5

Biology & Microbiology

Strong selection against the dominant phenotype

a. reduces the equilibrium frequency of the dominant genotypes b. completely eliminates the dominant genotypes c. has no effect on the dominant genotypes

Biology & Microbiology

Tree rings represent growth during wet and dry periods of the year. In a deciduous tree found in the north, which two seasons would contribute to tree rings?

A. summer and fall B. winter and summer C. winter and spring D. spring and fall E. spring and summer

Biology & Microbiology