What gas contributes to 78% of earth's modern atmosphere?

a. argon

b. nitrogen

c. oxygen

d. carbon dioxide

Lactic acid bacteria such as Lactococcus A. produce catalase. B. are obligate fermenters. C. require anaerobic environments. D. use oxygen as a final electron acceptor.

How much of Earth's fresh water is surface water, such as the water contained in the Great Lakes? A. more than 70% B. about 3% C. less than 1%

Which of the following is NOT an ossicle of the middle ear: A. pinna B. stapes C. incus D. malleus

Why do we need to destarch a plant

Which organism in the food web might be found in the first trophic level of the food chain? a. cougar b. mouse c. coyote d. acorns (apex)

Norway rats have 42 chromosomes in their diploid cells. If a diploid rat cell enters meiosis, how many chromosomes and double-helical molecules of DNA will be present in each daughter cell at the end of meiosis II?

Which discovery is attributed to Phoebus Levene? A. extraction and observation of DNA B. identification of ribose and deoxyribose C. recognition of RNA as DNA's messenger D. construction of an accurate DNA model

A small population of chimpanzees lives in a habitat that undergoes no changes for a long period. how will genetic drift probably affect this population?

Which type of cells can differentiate into many different types of cells? select all that apply

A person has such severe epilepsy that his limbs are paralyzed, and doctors recommend a radical hemispherectomy. what results can he expect?