Which structure develops from mesodermal tissue?
A) muscles
B) lining of the digestive tract
C) skin
D) nervous system
Answer: A
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In the lactose operon, the repressor binds to:
a. the lacI coding region. b. the promoter. c. the operator. d. the lacZ coding sequence. e. the lacY coding sequence.
A soft body usually enclosed by a hard shell is a characteristic of some
A. mollusks. B. arthropods. C. insects. D. vertebrates.
When Pasteur tested the hypothesis of spontaneous generation, he compared the ability of a sterilized growth medium (meat broth) to produce a population of bacteria in two different types of flasks. One had a simple neck open to the outside, and the
other had a "goose neck" bend that also was open to the environment. Pasteur expected that bacteria would appear in the flask with the standard neck. In this experiment, the standard neck flask served as a/an: A) statistic. B) variable. C) control. D) observation. E) hypothesis.
Each of the following provides evidence in support of the primary role of RNA in the evolution of life EXCEPT ________.
A. RNA is less chemically stable than DNA B. RNA catalyzes peptide bond formation during protein synthesis C. ATP (energy currency of the cell) is a ribonucleotide D. some RNA molecules are catalytic E. RNA can regulate gene expression