What explains the increased concentration of Ca++ in the ER?
A) Calcium ions are actively imported from the cytoplasm into the ER.
B) Calcium concentration is kept low in the cytoplasm because of its high usage level.
C) Calcium cannot enter the plasma membrane through ion channels.
D) Calcium levels in the blood or other body fluids are extremely low.
E) The Ca ions are recycled from other molecules in the ER.
Ans: A) Calcium ions are actively imported from the cytoplasm into the ER.
You might also like to view...
Which of the following affects the size of the clear zone in a disk diffusion test of antimicrobial susceptibility?
A. The solubility of the drug B. The diffusion rate of the drug C. The initial concentration of the drug D. All of the choices are correct.
Studies indicate that in utero nicotine exposure can cause breathing abnormalities in neonatal mammals, including
____.
a. elevated breathing rate while awake b. increased frequency of apneas during sleep c. delayed arousal from sleep in response to hypoxia d. elevated breathing rate while awake and increased frequency of apneas during sleep
e. increased frequency of apneas during sleep and delayed arousal from sleep in response to hypoxiaWhich of these groups is most closely related to humans?
a. gorillas b. new world monkeys c. orangutans d. old world monkeys e. chimpanzees
During which stage of syphilis does fever, lymphadenopathy, and a red to brown rash occur?
A) Secondary B) All of these choices are correct C) Latent D) Tertiary E) Primary