Your friend has a dog Rex that she feeds every night immediately after she gets up from the dinner table. You are dog-sitting one weekend and you decide to keep Rex at your house rather than leave him alone in hers. After you eat dinner and get up to clear the table, Rex starts salivating profusely and runs to his food bowl. Rex's behavior is an example of:
A. a conditioned response.
B. an automatic reflex.
C. an irrelevant response.
D. the anticipatory response.
E. permanent conditioning.
Answer: A
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Which of the following is not true of RNA synthesis by RNA polymerase?
A. RNA synthesis is less processive during elongation than during initiation. B. Synthesis begins with the polymerase binding two rNTP molecules. C. The polymerase frequently releases the nascent transcript before it reaches 8–10 nucleotides in length. D. The addition of an rNTP to a growing transcript is a magnesium ion-dependent reaction. E. All of the choices given are true.
The ____ gland(s) secrete(s) thyroid stimulating hormone (TRH)
a. thyroid b. parathyroid c. thymus d. hypothalamus e. anterior pituitary
Which of the following observations best indicates that living things evolved in different time periods?
a. Extinct organisms found only as fossils were destroyed in global catastrophes. b. Layers of rock are deposited in a slow, gradual process. c. Species in a location resemble one another more than species in another location. d. Fossil A always appears in a layer below fossil B. e. In many parts of the world, a rock layer of type A always appears below a rock layer of type B.
Fertilization results in the formation of a(n) ______________.
A. ovum. B. zygote. C. gamete. D. DNA helix.