The presence of which of the following features
distinguishes prokaryotic cells from eukaryotic
cells?
a. cytoplasm
b. nucleus
c. ribosomes
d. plasma membrane
e. DNA
Answer: b
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A college campus - including the students, birds, trees, sidewalks, and air - makes up one complete ________.
A. organism B. community C. population D. ecosystem
James Watson and Francis Crick
a. were both English researchers working at Cambridge University. b. performed elegant experiments in DNA chemistry. c. constructed an accurate model of the DNA molecule illustrating its structural simplicity. d. performed experiments that convinced scientists that DNA is a double-stranded molecule. e. did all of these
Choose the letter of the best match from the following:A. Abscisic acidB. TrichomesC. AquaporinD. EndodermisE. StomaPore in leaves that regulates gas exchange.
Fill in the blank(s) with the appropriate word(s).
Which of the following would allow optimal population growth?
a) unlimited resources b) accumulation of waste products c) predation d) competition e) limited access to food and water