Sterilization by filtration removes microbes from heat-sensitive liquids and circulating air. The type of microbe removed depends on the
A) pH of the liquid.
B) temperature of the liquid.
C) temperature of the air.
D) pore size of the filter.
Ans: D) pore size of the filter.
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Calculate the coefficient of relatedness for the following relationships in a haplodiploid hymenopteran spe-cies: Sister to full sisters Sister to brother Brother to sister
What will be an ideal response?
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.
Brassica oleracea was a European wild plant. Early farmers were able to use artificial selection on this plant to produce cabbage, Brussels sprouts, kohlrabi, kale, broccoli, and cauliflower. This diversification through selection was possible because:
A. artificial selection is always possible, whereas natural selection requires much larger population sizes. B. the species contained large amounts of genetic variation. C. artificial selection does not require differential reproductive success, whereas natural selection does. D. artificial selection is only done on plants that are used for food, whereas natural selection is used on all other plants.
The interlocking rib cage of Titaalik roseae suggests that this transition organism had lungs, which of the following traits were also found in T. roseae but not in the ancestral form?
A. An upright stance. B. Wings. C. Primitive wrist and five finger-like bones. D. Live young. E. Articulating hip bones.