Assume that a dihybrid F2 ratio, resulting from epistasis, was 15:1. If a double heterozygote was crossed with the fully recessive type, what phenotypic ratio is expected among the offspring?
A) 1:3 B) 3:1 C) 5:7 D) 1:2 E) 1:1
Answer: B
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Dideoxynucleotides
A. are useful in nucleic acid sequencing. B. have two additional hydroxyl groups at the 2' and 3' carbons. C. act as chain initiators. D. act as chain terminators. E. are useful in nucleic acid sequencing AND act as chain terminators.
Parasitoid wasps are sometimes involved in a plant's defensive response. In what way are the wasps helpful to the plant?
A. The wasps respond to a chemical the plant gives off when wounded, and the wasps lay their eggs on the caterpillar that wounded the plant. B. The wasps live in hollow thorns of the plants, and attack the plants' predators. C. The wasps stimulate the production of alkaloids the plants use for defense. D. The wasps enhance the plants' hypersensitive response. E. The wasps trigger leaf abscission so that herbivores do not have anything to eat.
The different types of nucleic acids found in viruses include all of the following except
A. double-stranded DNA. B. single-stranded DNA. C. single-stranded RNA. D. double-stranded RNA. E. There are no exceptions here. Each of these types may be found in viruses.
All of the following are found in eukaryotic cells EXCEPT
a. a nucleus. b. a mitochondrion. c. a nucleoid. d. ribosomes.