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WorksheetsDNA Structure and Function/Replication Quiz A
Total questions: 10
Worksheet time: 6mins
Which is not a component of a nucleotide?
codon
sugar
phosphate group
nitrogen base
A repeating non-coding sequence that serves as a protective cap at the end of a chromosome is known as a
chromatin
telomere
chromatid
DNA
The end of a DNA or RNA strand where nucleotides can be added during replication
nucleotide
telomere
5’ end
3’ end
An Okazaki fragments are
the parts of the leading strand where replication occurs
the lagging strand of DNA replication that contains gaps within it
the parts of the DNA strand where hydrogen bond is broken
the parts of the lagging strand that help bond the nucleotides together after they come together
The region on the surface of an enzyme where the substrate binds
ligand
inhibitor
product
active site
Which is a purine? (Check all that apply)
adenine
thymine
guanine
cytosine
_________________________ attaches the fragments to each other
DNA ligase
DNA primase
DNA polymerase
Helicase
Chromosomes get shorter every time they replicate
True
False
Erwin Chargaff investigated the nucleotide composition of DNA. He analyzed DNA from various organisms and measured the relative amounts of adenine (A), guanine (G), cytosine (C), and thymine (T) present in the DNA of each organism. Table 1 contains a selected data set of his results. Which of the following statements best explains the data set?
Since the %A and the %G add up to approximately 50 percent in each sample, adenine and guanine molecules must pair up in a double-stranded DNA molecule.
Since the %A and the %T are approximately the same in each sample, adenine and thymine molecules must pair up in a double-stranded DNA molecule.
Since the %(A+T) is greater than the %(G+C) in each sample, DNA molecules must have a poly-A tail at one end.
Since the %C and the %T add up to approximately 50 percent in each sample, cytosine and thymine molecules must both contain a single ring.
Which of the following best explains how continuity of genetic information in cells is ensured across generations?
Replication uses a parental strand of DNA as a template to create a new strand of DNA.
DNA molecules are shaped like a double helix with a constant diameter throughout.
Transcription copies the information in DNA into an RNA transcript.
Cells contain different polymerases for DNA replication and transcription.
