Examined cancer cells from the lungs of smokers demonstrate which of the following?
A) mutation rates that are similar to those in a smoker's heart
B) normal mutation rates compared to non-smokers
C) unregulated methylation patterns
D) the occurrence of tumor-suppressor mutations is less in the lung than the throat
Answer: C
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. Former president Ronald Reagan once commented at a press conference that the best way to combat the spread of AIDS in the US was to prohibit everyone from having sexual contact for 5 years
What would be the success of such a program if it were possible to carry out? A. It would 'cure' the population of HIV/AIDS. Everyone that had it would die off, and no new cases would occur, since sexual contact is the only mode of transmission for this virus. B. It would be a failure-this 'program' wouldn't eliminate IV drug use or transmission of HIV from mother to child. Sexual transmission isn't the ONLY mode of transmission for this virus. C. It would be a failure-many HIV positive individuals survive for longer than 5 years, even without treatment (sometimes without even realizing they're positive). Once sexual contact resumed, sexual transmission would also resume. D. It would be a failure-this 'program' wouldn't eliminate IV drug use or transmission of HIV from mother to child. Sexual transmission isn't the ONLY mode of transmission for this virus, AND many HIV positive individuals survive for longer than 5 years, even without treatment (sometimes without even realizing they're positive). Once sexual contact resumed, sexual transmission would also resume.
Sebaceous glands in the skin produce ____
a. oils b. sweat c. tears d. new skin cells e. hormones
Many poisonous snakes share warning colors of red, yellow, and black. This is an example of:
a. Batesian mimicry. b. mutualism. c. camouflage.
d. Müllerian mimicry. e. character displacement.
If an atom has the atomic number 11 and the atomic mass 22.99, it will have
A. 1 electron in the third energy level. B. 1 electron in the second energy level. C. 3 electrons in the fourth energy level. D. 1 electron in the first energy level.