Flowering plants ____
a. only reproduce asexually
b. produce clones through sexual reproduction, and under certain circumstances seeds through asexual
reproduction
c. reproduce asexually about half the time and sexually about half the time
d. only reproduce sexually
e. produce seeds through sexual reproduction, and under certain circumstances clones through asexual
reproduction
ANSWER: e
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In almost all organisms that have been studied, the genes in Hox clusters:
A. are arranged on chromosomes in the same order as their products function along the anterior-posterior segments of the embryo. B. are expressed in a sequence that is independent of their linear organization along the chromosome. C. each contain a unique homeodomain, the the products of which are very different among organisms. D. are arranged on the chromosomes in a sequence that is independent of the order in which their products function along the anterior-posterior axis of the embryo. E. None of these choices are correct.
Darwin observed an orchid flower with petals arranged in very long, thin tubes, rather than broad and flat, as we might see in other common flowers. What is the advantage to the orchid having an 11-inch-long nectar tube arrangement of the petals?
A. The long tube can trap insects as a source of nutrients. B. The flower can collect more sunlight for photosynthesis. C. The flower can produce nectar more easily spread over a larger area to attract more pollinators. D. The flower nectar tube can collect more rainwater to maintain health of the flower. E. The flower can only be pollinated by a specifically adapted pollinator, reducing cross-fertilization among orchid species.
First, give the amino acid sequence for the following DNA segment: AATCGAGGTACA. If a base substitution mutation occurred in this segment of DNA, would the resultant amino acid chain be affected?
What will be an ideal response?
Rebecca Lancefield differentiated streptococci on the basis of differences in their:
A. cell wall carbohydrates in a serological test. B. patterns of hemolysis on blood agar. C. ability to produce catalase. D. gram stain appearance. E. All of the choices are correct.