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CH13

biology 1301

QuestionAnswer
The genetic material of all living organisms is deoxyribonucleic acid
If a stretch of human double stranded DNA contains 47% G + C, then it contains 53% A + T
The DNA of an organism is studied and found to contain 30% adenine. Based on this you would predict that the DNA of this organism also contains 30% ____. thymine
In DNA the purines are adenine and guanine
In DNA the pyrimidines are thymine and cytosine.
Which of the following nucleotide sequences represents the complementary sequence that would bind to the DNA strand 5'-GACGTT-3' 3'-CTGCAA-5
A DNA double helix has two strands that are held to each other by ____ hydrogen bonds
The two strands of a DNA double helix are said to be antiparallel. This means that the 5' end of one strand is directly paired with the 3' end of the other strand
DNA replication is said to be semiconservative because each new DNA molecule is composed of one old strand and one new strand
Which of the following adds individual nucleotides to the 3' end of an existing strand to build a new DNA strand during DNA replication DNA polymerase
Which of the following acts to remove overtwisting and strain ahead of the replication fork during DNA replication? topoisomerase
Which of the following closes "nicks" between DNA fragments, forming a covalent bond that ties or joins the fragments together DNA ligase
What assembles a short RNA chain as the first nucleotides in a new DNA strand primase
During DNA replication, DNA ligase is most active on the lagging strand. Why? The lagging strands contain more short DNA segments than the leading strand, and these short segments are joined together by DNA ligase
Reiji Okazaki discovered that what are now called "Okazaki fragments" are produced during DNA replication. These are short lengths of new DNA on the lagging strand.
DNA replication must start at a replication origin. In eukaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____ replication origin. linear; more than one
Telomeres are found at the ends of a chromosome
Nucleosomes are best described as eukaryotic DNA associated with histone proteins.
The Barr body found in mammalian females is an X chromosome compacted to the level of ____. heterochromatin
DNA replication must start at a replication origin. In prokaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____ replication origin. circular; one
Created by: TejasRanger29
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