Why is there a problem replicating the ends of linear DNA?
A. Leading strand synthesis primed at the replication origin of a linear DNA can't remove and replace the primer.
B. Lagging strand synthesis primed at the ends of a linear DNA can't be removed and replaced because there is no 3'-OH available.
C. Since replication only initiates at the ends of linear DNA, the priming of each leading strand leaves a primer at the end that cannot be removed.
D. Okazaki fragments are generated along both strands but DNA ligase is inhibited by the Tus-Ter complexes at the ends of the DNA.
E. Primase cannot copy telomere DNA.
B
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Which of the following statements is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine, and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. None of these statements are true.
When one species reduces or adversely affects the population of another, but the affected species has no influence in return, the relationship is referred to as ________
Fill in the blank(s) with correct word
Scientists use mitochondrial DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, mitochondrial DNA samples taken from ____ would have the most unique mutations, representing the original and oldest DNA sequences.
A. Africa B. Asia C. Australia D. Europe E. the Americas
Several hypotheses have been proposed to explain the evolutionary origin of viruses. Which of the following does NOT assume that viruses evolved from living cells?
A. Viruses evolved from macromolecules-lipids, proteins, nucleic acids, and carbohydrates. B. Viruses evolved from chromosomal elements. C. Viruses evolved from plasmids that acquired genes for their own replication. D. The precursors of DNA genomes may have been self-replicating RNA molecules. E. Viruses evolved by losing all the genetic information that is not absolutely required for reproduction.