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 […]

Niremberg used the enzyme polynucleotide phosphorylase to assemble RNAs with random sequences in the absence of a template. Supposethey added the enzyme to a solution of 90%CTP and 10%UTP, and then used a cell-free system of protein synthesis to make peptidesaccording to the sequences in their synthetic RNAs. a.) Which […]

Over the long period of time that life has existed on Earth, there have been a number of important or significant innovations including (but not limited to) endosymbiosis to create mitochondria and chloroplasts; multicellularity; adaptation to land by plants and animals; development of exoskeletons in arthropods, shells in molluscs, and […]