BSC 120 Chapter 3 Exam Questions Correctly Answered.
The correct structure of DNA nucleotides can be presented as - CORRECT ANSWER base-phosphate-sugar.
phosphate-base-sugar.
phosphate-sugar-base.
phosphate-sugar-phosphate-base.
base-sugar-phosphate-base.
This is a characteristic of dou...
The correct structure of DNA nucleotides can be presented as - CORRECT ANSWER base-phosphate-
sugar.
phosphate-base-sugar.
phosphate-sugar-base.
phosphate-sugar-phosphate-base.
base-sugar-phosphate-base.
This is a characteristic of double-stranded DNA: - CORRECT ANSWER 2 nanometers in width and 10 base
pairs per turn
0.34 nanometers per basepair
10 base pairs per turn
2 nanometers in width, 10 base pairs per turn, and 0.34 nanometers per base pair
2 nanometers in width
Which of the following DNA molecules is the most stable? - CORRECT ANSWER AGTCGAAT
TCAGCTTA
CTGCATAC
GACGTATG
GCGTGCAC
CGCACGTG
GAAATTTC
CTTTAAAG
,GGATCCTG
CCTAGGAC
A mutation is an heritable change in the DNA of a cell. Mutations are rare occurrences and are often
caught by the cell's "proofreading" system during cell replication and so are not passed on to offspring.
Why is it more likely for an A nucleotide to mutate to a G nucleotide than to a T nucleotide? - CORRECT
ANSWER Because A and G are both pyrimidines, they will maintain the proper number of hydrogen
bonds across the backbone of the helix.
Because if A mutated to T, there would be hydrogen bonding between two thymines. Like bases cannot
pair together because they repel each other.
Because A and G are both purines, they will maintain the proper number of hydrogen bonds across the
backbone of the helix.
Because A and G are both purines, the width between the base pairs across the double helix will not be
distorted.
Because A and G are both pyrimidines, the width between the base pairs across the double helix will not
be distorted.
The most accurate statement about the DNA double helix is . . . - CORRECT ANSWER Complimentary
base pairing allows the production of identical copies of the template strand (or parts of the template
strand) via RNA transcription and DNA replication.
The 3' end of the double helix terminates in a nitrogenous base on the 3' carbon.
Complimentary base pairing across the double helix allows information to be transferred via RNA
transcription and DNA replication.
It takes large amounts of energy to separate the double helix because it is held together via covalent
bonds.
The 5' end of the double helix terminates in a nitrogenous base on the 5' carbon.
Compare DNA and RNA by indicating which statement applies to which molecule.
DNA
RNA - CORRECT ANSWER ribose sugar within backbone
, double-stranded
nitrogenous bases A, U, G, C
housed within the nucleus of an animal cell
single-stranded
nitrogenous bases A, T, G, C
You have been asked to create a complementary RNA strand for four nucleic acid sequences. Match up
each original sequence with its resulting RNA complement.
1. TAGGACGCTTAGC
2. TCGATTGCGATCG
3. ATCGTCCGATGAC
4. UCGUAGCCAGGCG - CORRECT ANSWER AGCAUCGGUCCGC
UAGCAGGCUACUG
AUCCUGCGAAUCG
AGCUAACGCUAGC
Label the DNA molecule. - CORRECT ANSWER phosphate
nitrogenous base
sugar
covalent bond
hydrogen bond
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