The following steps occur during multiplication of retroviruses. Which is the fourth step?

A) synthesis of double-stranded DNA
B) synthesis of +RNA
C) attachment
D) penetration
E) uncoating


A

Biology & Microbiology

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The process that a tall tree uses to move water to the leaves at the top of the tree involves primarily

a. cohesion and evaporation. b. evaporation and pumps. c. capillary action and pumps. d. positive pressure from roots and cohesion. e. capillary action and positive pressure from roots.

Biology & Microbiology

Which of the following statements is true about the serotonin receptor family?

a. Most of the receptors are ionotropic b. 5-HT1A receptors are located primarily in the cerebral cortex c. 5-HT2A receptors cause inhibition by decreasing adenyl cyclase and increasing potassium efflux d. The newer antipsychotics like Risperdal act by blocking the 5-HT2A receptor e. LSD and similar hallucinogens are most likely agonists at the 5-HT1A receptor

Biology & Microbiology

Which of the following is a limit of evolution that results in exaptations?

A) Natural selection and sexual selection can work at cross-purposes to each other. B) Evolution is limited by historical constraints. C) Adaptations are often compromises. D) Chance events affect the evolutionary history of populations in environments that can change unpredictably.

Biology & Microbiology

________ is used by white blood cells to consume large particles such as bacteria

Fill in the blank(s) with correct word

Biology & Microbiology