The MHC (major histocompatibility complex) class molecules
A. are found in the nucleus of cells.
B. allow the immune system to respond to antigens inside cells.
C. are only found on B cells.
D. are lipoproteins on cell surfaces.
E. do not attach to plasma membranes.
Answer: B
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The three major parts of a cell are
A. the nucleus, nucleolus, and nuclear envelope. B. the nucleus, cytoplasm, and cell membrane. C. microtubules, ribosomes, and centrosomes. D. the endoplasmic reticulum, Golgi apparatus, and vesicles.
Sensations of burning or aching pain
A) are carried by type A fibers. B) reach the CNS quickly. C) cause a generalized activation of the reticular formation and the thalamus. D) are well localized. E) are fast adapting.
The reactions of the Krebs cycle:
A. take place in the cytosol of human cells. B. generate ATP directly by substrate-level phosphorylation. C. are important for the metabolism of carbohydrates but not other molecules. D. take place only when no oxygen is present. E. produce pyruvate and lactate as end products.
Which type of skin cancer is the most deadly?
A. Kaposi's sarcoma B. basal cell carcinoma C. melanoma D. squamous cell carcinoma E. psoriasis