Endocytosis
A. moves material out of the cell.
B. ends cell functions.
C. is a process that requires a carrier molecule but does not use cellular energy.
D. is the bulk uptake of material through the plasma membrane by vesicle formation.
E. is movement of water through a selectively permeable membrane.
Answer: D
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Carbon and oxygen atoms are removed as carbon dioxide in a process called
A) anabolism. B) decarboxylation. C) deamination. D) oxidative phosphorylation. E) substrate-level phosphorylation.
Keratinocytes
a. form the outer protective layer of the skin b. secrete interleukin 1 c. present antigens to helper T cells d. have characteristics a and b e. have characteristics a and c
A dipeptide is a molecule with two peptide bonds.
Answer the following statement true (T) or false (F)
This is a diagram of calcium homeostasis. What process is represented by "A"?
A. Vitamin D promotes calcium absorption. B. PTH promotes calcium release into blood by osteoclast. C. Calcium is lost in urine. D. PTH promotes calcium reabsorption from urine. E. Calcium is removed from blood by osteoblasts.