In an mRNA transcript, the 3' UTR refers to the region of the mRNA that is ____
a. upstream from the start codon
b. upstream from the site for initiation of transcription
c. downstream from the stop codon
d. the coding region
e. downstream from the site for termination of transcription
ANSWER: c
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Homeostasis provides what kind of internal
environment? a. positive b. relatively constant c. limiting d. changing e. chemical and physical
Papillomaviruses are transmitted by (aerosols/direct contact/secretions)
What will be an ideal response?
A number of plants in a wilderness area carry a mutation that makes their soft, colorful fruits bitter and unpalatable. Would you expect this mutation to increase or decrease in frequency in the plant's population?
A. It depends whether the plants use sexual or asexual reproduction. B. The mutation will decrease in frequency. C. It depends whether they are pollinated by the wind, birds, or insects. D. The mutation will increase in frequency.
Two healthy parents (asymptomatic) have a child with Tay-Sachs disease. Which of the following best explains this phenomenon and its possible screening?
The phenomenon occurred because the parents are both carriers of the gene for the disease, but with screening of the parents combined with genetic counseling and embryo testing, the phenomenon could have dramatically been reduced. The phenomenon occurred because both parents were gene carriers, but there is no testing available at this point for a disease such as Tay Sachs. The phenomenon occurred because the dominant Tay-Sachs gene was active in the child, but not in the parents. This phenomenon is not possible, since both parents are asymptomatic. The phenomenon occurred due to a point mutation that occurred during fertilization, but testing could have informed the parents of the disease in their unborn child.