Heritable units of information about traits are called __________. Fill in the blank(s) with the appropriate word(s)
ANS: genes PTS: 1 DIF: Easy
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What is the appropriate order of the stages of investigating whether maple trees drop their leaves in the autumn because of colder days?
(1) Maple trees are grown in two greenhouses where the only variable is temperature (15?C vs. 10?C). (2) The hypothesis is rejected. (3) There is no statistical difference in the number of leaves dropped at 10?C as compared to 15?C. (4) The observation is that maple trees drop their leaves in autumn. (5) The hypothesis is that maple trees drop their leaves because of colder temperatures. A. 1, 2, 3, 4, 5. B. 3, 4, 5, 1, 2. C. 5, 4, 3, 1, 2. D. 4, 5, 1, 3, 2. E. 3, 4, 2, 1, 5.
An infectious RNA molecule is a
A. virion. B. bacteriophage. C. virus. D. prion. E. viroid.
Fossils
a. are found in underground layers of rock. b. are distributed underground, with the oldest forms near the top. c. have more complex structures the deeper they are buried. d. are the same throughout the world no matter where they are found. e. that are most like living organisms are found deepest in the ground.
Which of the following is NOT a characteristic of both DNA and RNA polymerases?
A) directionality of synthesis B) energy is provided by pyrophosphate C) hydrogen bonding of complementary nucleotides D) requirement for an initiation signal E) requirement for a primer