The ability of a person to roll their tongue is controlled by a single gene with two alleles. About 65% of people have the dominant allele, and can therefore roll their tongue. Stephanie cannot roll her tongue. Without yet knowing her mate, what is the probability that Stephanie’s first child […]

Question 1 Which of the following people is INCORRECTLY matched with his/her environmental contribution? A.Rachel Carson: Silent Spring B.John Muir: Sierra Club C.Paul Ehrlich: The Population Bomb D.Theodore Roosevelt: Civilian Conservation Corps Question 2 DDT was sprayed in a Long Island salt marsh over a period of years for mosquito […]

Estrogen and testosterone are both produced in the male body. Unlike in the female body, breast tissue in a normally developing male does not become enlarged in response to normal estrogen levels. Which statement explains why? A. When bound to estrogen, male estrogen receptors in breast cells do not signal […]

Q. A student designs an experiment to create an alcohol known as butanol. She mixes a species of Clostridium bacteria known to produce this alcohol as a by-product of its metabolism with a broth of water and glucose in excess, and incubates the mixture in constant darkness without any oxygen. […]