Which of the following is a function of dendritic cells?

A) antigen presentation
B) plaque formation
C) phagocytosis
D) both phagocytosis and plaque formation


Answer: D

Biology & Microbiology

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Which of the following statements about an action potential is NOT true?

A. An action potential takes 2 to 5 seconds. B. Repolarization occurs when potassium leaves the axon. C. There is a rapid change in polarity from about -70 mV to about +35 mV during depolarization. D. Potassium gates open after the sodium gates and allow potassium ions to leave the cell. E. Depolarization occurs when sodium gates open and allow sodium ions to enter the axon.

Biology & Microbiology

Prevention of eating disorders might include any of the following EXCEPT

Select one: a. discourage dieting. b. teach normal, healthy approach to eating and nutrition. c. encourage eating in relation to hunger and satiety cues. d. weighing often.

Biology & Microbiology

How are processed mRNAs exported from the nucleus to the cytoplasm?

a. Eukaryotic transcription mechanically ejects mRNA from the nucleus. b. After the 5’ cap is added, it migrates to the cytoplasm by diffusion. c. After the poly-A tail is added, it binds to a protein for transport. d. mRNA is released into the cytoplasm when the nuclear envelope dissolves.

Biology & Microbiology

The 1997–1998 El Niño resulted in all of the

following EXCEPT a. crop failures and wildfires in Australia and Indonesia. b. the death of many seals and sea lions. c. massive flooding and landslides. d. a massive ice storm in the southwestern United States. e. massive flooding in California and Peru

Biology & Microbiology