The dominant land plants during the Mesozoic era, from about 250 million years ago to 65 million

years ago, were ____.



a. lycophytes
b. ferns
c. gymnosperms
d. bryophytes
e. angiosperms


C

Biology & Microbiology

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If the Earth spun in the opposite direction what would change?

A) The equator would become as cold as the poles. B) Air masses in the Northern Hemisphere would rotate counterclockwise. C) Equatorial air would fall rather than rise. D) Winter would occur in July in the Northern Hemisphere.

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Define Ockham’s razor and provide an example. What will be an ideal response?

Biology & Microbiology

Why is photosynthesis a coupled reaction?

A) Photosynthesis requires two reactants: carbon dioxide and water. B) Sunlight energy enters a plant and is ultimately lost as heat. C) The exergonic reaction occurs in the plant, and the endergonic reaction occurs in the sunlight. D) The exergonic reaction occurs in the plant, and the endergonic reaction occurs in the soil. E) An exergonic reaction occurs in the sunlight, and an endergonic reaction occurs in the plant.

Biology & Microbiology

Which of the following are characteristics of RNA? (Check all that apply)

a. It consists of two nucleotide chains. b. It carries out the instructions in DNA and assembles proteins. c. It contains a sugar called deoxyribose. d. It leaves the nucleus and functions mainly in the cytoplasm. e. It contains 70 - 10,000 nitrogenous bases, mostly unpaired. f. It contains nitrogenous bases A, U, C, G.

Biology & Microbiology