You are practicing throwing baseballs long distances with the members of your baseball team. At the same time that your partner throws the ball to you, another player across from you throws his baseball off-target, and it heads straight toward you. You
hold your baseball glove up to catch your partner's ball, and you instinctively throw up your other arm to protect your face from the other incoming ball. The protective action of throwing up your arm is an example of a(n)
A) reflex.
B) synapse.
C) sympathetic response.
D) parasympathetic response.
Answer: A
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To control microbial growth in a food, one can decrease water availability by the addition of ________.
A. agar B. gelatin C. sugar or salt D. formaldehyde
Consider a chromosome with ordered loci A (A/a), B (B/b), C (C/c), D (D/d), and E (E/e) where the letters in the parentheses indicate the alleles at loci
On a chromosome in which A, C, D, and E are coupling, a new allele arises at the locus B. This new allele B, has a negative effect on fitness. As a result, we would expect: a. the genetic variation at neighboring loci to decrease. b. the alleles A, C, D, and E may be lost due to background selection. c. the alleles A, C, D, and E may be lost due to genetic hitchhiking. d. A and B. e. All of the above.
The central dogma of molecular biology states that information flows from:
A. DNA directly to proteins. B. protein to RNA to DNA. C. DNA to RNA to protein. D. RNA to protein to DNA. E. RNA to DNA to protein.
When the human genome was sequenced, we learned that there are fewer than expected protein coding genes
(approximately 20,000). Yet, the total number of proteins produced in humans approaches 100,000. What accounts for this discrepancy in numbers?
a. We have not yet identified all of the open reading frames in the human genome. b. We have not yet fully sequenced the human genome. c. mRNA processing mechanisms allowmultiple proteins to be produced from a single DNA sequence. d. Some noncoding DNA sequences encode proteins. e. There has been a gross over-estimation of the number of proteins produced in humans.