Which does not produce variation?
1.crossing over
2.random alignment of chromosomes during meiosis
3.mitosis
4.genetic recombination of alleles
5.sexual reproduction
3
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Research into the genetics of invertebrates
a. is mostly complete, and is considered by most biologists to be a field of the past. b. holds the promise to address many important basic and applied research questions that could have profound positive effects on human health. c. should be largely abandoned in favor of research into the genetics of vertebrates, since findings in invertebrates have little chance of making a difference for humans. d. is at an early stage, as genetic research in the past has almost exclusively been centered on vertebrate animals and bacteria. e. has led biologists to largely abandon hope of understanding animal development due to the complexity of developmental processes.
A nucleotide consists of ____
a. a five carbon sugar, a nitrogenous acid, and a phosphate group b. a six carbon sugar, a nitrogenous base, and a phosphate group c. a five carbon sugar, a nitrogenous base, and a phosphate group d. a six carbon sugar, a nitrogenous acid, and a phosphate group e. a four carbon sugar, a nitrogenous acid, and a phosphate group
Energy is important to life forms because
A) all life forms require a continuous supply of energy. B) energy is required to do work. C) energy is required to make specific alterations in the cell. D) all life forms require a continuous supply of energy and energy is required to do work. E) all life forms require a continuous supply of energy, energy is required to do work, and energy is required to make specific alterations in the cell.
Sanger sequencing is based on the order in which ddNTPs are added to a growing polynucleotide. Why are ddNTPs integral to the Sanger sequencing method?
A) They have a 2? hydroxyl that allows for extension of the polynucleotide. B) They do not have a 2? hydroxyl, which does not allow the extension of the polynucleotide. C) They do not have a 3? hydroxyl, which does not allow the extension of the polynucleotide. D) They have a 3? hydroxyl that allows for extension of the polynucleotide.