Smooth endoplasmic reticulum is abundant in cells that specialize in protein synthesis
a. True
b. False
Indicate whether the statement is true or false
False
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Why do we need to breath in, exchange, and deliver to each cell the oxygen molecule?
a. glucose can't be broken down without it. b. it pulls electrons off the electron transport chains in the last part. of cell respiration. c. all chemical reactions require it. d. all of these answers. e. none of these answers.
The function of a third, obliquely-oriented layer of smooth muscle in the muscularis externa of the stomach is to ________
A) churn, mix, and pummel the food contents to reduce them to small fragments B) carry waves of contraction around the stomach C) squeeze the stomach to reduce its size after a meal has emptied from it D) allow stronger contractions than those occurring in other parts of the alimentary canal
How do abnormal antigens attached to class I MHC proteins initiate an immune response?
A) Abnormal antigens are displayed on the surface of the cell's plasma membrane and recognition by regulatory T cells initiates the initial immune response. B) Abnormal antigens are displayed on the surface of the cell's plasma membrane and recognition by CD4 T cells initiates the initial immune response. C) Abnormal antigens are displayed on the surface of the cell's plasma membrane and recognition by CD8 T cells initiates the initial immune response. D) Abnormal antigens are displayed on the surface of the cell's plasma membrane and recognition by plasma cells initiates the initial immune response. E) Abnormal antigens are displayed on the surface of the cell's plasma membrane and recognition by NK cells initiates the initial immune response.
When a neurotransmitter causes the opening of chemically gated potassium channels on the postsynaptic cell, the postsynaptic potential that results is an
A. EPSP, which is a hyperpolarization B. IPSP, which is a hyperpolarization. C. EPSP, which is a depolarization. D. IPSP, which is a depolarization.