The 3? end of eukaryotic pre-mRNAs are changed by:
a. removing the last phosphate group.
b. adding a "cap."
c. copying the last few bases so that it can form a duplex structure.
d. adding 100?250 adenine nucleotides.
e. phosphorylation of the mRNA molecule
D
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The mutagens 2-aminopurine and 5-bromouracil are examples of
A) alkylating agents. B) nucleotide base analogs. C) chemicals reacting with DNA. D) None of the answers are correct.
A homeotic gene regulates _____
a. where body parts form c. secondary sexual traits b. milk production d. sperm formation
The components of membranes that account
for most of their active functions are a. carbohydrates. b. sterols. c. proteins. d. fats. e. phospholipids
There are nine coat colors known in foxes. If a red
fox were crossed with a double-black fox, all the hybrids would be red above and black below in a pattern known as blended cross. If two blended crosses were mated, the F2 ratio would be as follows: 1 red, 2 smoky red, 2 cross red, 4 blended cross, 1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double black. (a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype for each variety listed. (b) Two crosses will produce all blended-cross offspring. One is used above (red fox x double black); what is the other? (c) List the genotype and phenotype of all the pure-breeding foxes. (d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers. (e) Give the genotype and phenotype of the offspring produced in a cross of a sub-Alaskan silver and a cross red. What will be an ideal response?