How many oxidation reactions occur during the Krebs cycle?
A. 1
B. 2
C. 4
D. 6
E. 9
C. 4
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Hornworts differ from mosses and liverworts in containing
A. small leaves. B. sporophytes. C. photosynthetic sporophytes. D. gametophytes. E. spores.
Assume that a species has a diploid chromosome number of 24. The term applied to an individual with 25 chromosomes would be triploid
Indicate whether the statement is true or false
When choosing a restriction enzyme for use in recombinant DNA technologies, it is often preferred that the enzyme generate cohesive, or "sticky," ends. Why is this preferred?
A) The sticky ends stick to the purification medium making the fragments easier to purify. B) The sticky ends do not have hydrogen bonds to help in re-annealing the cut DNA. C) The sticky ends prevent the DNA from re-annealing to any DNA. D) The sticky ends have hydrogen bonds that help re-anneal the cut DNA. E) The sticky ends make the DNA bind tighter to any cut DNA.
Autosomal dominant diseases are exhibited by anyone who carries at least one dominant allele for that gene. How is it that dominant lethal genes, such as the one that causes Huntington disease, can persist in a population?
a. The disease-causing allele can "hide" in the heterozygous condition. b. The disease develops only under the influence of other genes. c. These diseases usually take effect later in life after people have had children. d. The environment plays a large role in determining whether the gene is expressed.