Which statement concerning transmembrane proteins in the plasma membrane is false?
A. Some have carbohydrate chains and help form the glycocalyx.
B. They may be carriers that transport substances from one side of the plasma membrane to the other.
C. They are more abundant than the phospholipids.
D. They extend all the way through the plasma membrane.
E. They may serve as channels that allow certain solutes to enter and leave the cell.
Answer: C
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Some neurons in the vagus nerve have synaptic connections to sinoatrial cells (pacemaker) in the heart. These neurons secrete acetylcholine, which ultimately results in a decreased heart rate. This is an example of
A. neural control. B. endocrine control. C. hormonal control. D. exocrine control. E. paracrine control.
The right ventricle pumps deoxygenated blood through the tricuspid valve and into the pulmonary arteries
Indicate whether the statement is true or false
The head of a sperm is mostly
A. nucleus. B. mitochondria. C. cytoskeleton. D. cell membrane.
Using the figure below, identify the labeled part.
1) Label A: ______________________________
2) Label B: ______________________________
3) Label C: ______________________________
4) Label D: ______________________________
5) Label E: ______________________________
6) Label F: ______________________________
7) Label G: ______________________________
8) Label H: ______________________________
9) Label I: ______________________________
10) Label J: ______________________________
11) Label K: ______________________________
12) Label L: ______________________________
13) Label M: ______________________________
14) Label N: ______________________________
15) Label O: ______________________________
16) Label P: ______________________________
17) Label Q: ______________________________