Charlotte liked to have a suntan all of the time, so she never wore sunscreen at the beach or in the tanning salon. During a visit to her doctor, she was told that she has the most common form of skin cancer
She will be all right, but she should avoid prolonged exposure to UV radiation in the future. Which skin cancer does she have? A) melanoma
B) squamous cell carcinoma
C) sebaceous carcinoma
D) basal cell carcinoma
D
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Which of the following best explains why bees aren't attracted to red flowers?
A. Bees perceive red as a warning signal. B. Bees can't see red. C. Red flowers usually are odorless. D. Both because red flowers are odorless and because bees can't see red. E. All of the other choices provided are incorrect.
An enzyme that works in the stomach may not work in the small intestine because
A. the pH of the stomach contents is different than that found in the intestine. B. the temperature is so different that the enzyme will be inhibited from taking action. C. enzymatic competition will result in the denaturation of the substrate. D. there will not be enough collisions to result in enzyme-substrate formation.
T cell receptors recognize ______, distinguishing cells that belong to the body from infected body cells.
A. antigens B. MHC markers C. antigens and MHC markers D. complement E. cytokines and complement
Which of the following is NOT true regarding ATP synthases?
A. They require proton motive force to make ATP. B. The subunits of ATP synthase undergo conformational changes during ATP production. C. The proton flow is outward during ATP synthesis. D. They span the inner membrane of mitochondria.