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The question
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The correct answer
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An explanation why this answer is correct
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Some supporting information about the question
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Explain why the other answers are incorrect
o Describe or define the incorrect answers (if appropriate)
21) DNA replicates by breaking the bonds between its two strands, after which
each strand
A) serves as a template for synthesis of a new strand.
B) winds back upon itself exactly two times.
C) grows to double its original length.
D) takes a spiral appearance that is twice as thick.
22) Which is not consistent with Watson and Crick’s model for a DNA molecule?
A) it is composed of two strands made up of nucleotides
B) the strands are twisted into a helix
C) the strands are held together by unbreakable chemical bonds
D) adenine pairs with thymine and cytosine pairs with guanine
23) The coded material that migrates from a cell nucleus to a ribosome where a particular protein
will be synthesized is called
A) messenger RNA
B) codon DNA
C) transfer RNA
D) ribosomal RNA
24. If one side of a DNA molecule has the base sequence: TAG CGA GCG.
What would the sequence of bases be on the other side?
A) TAG CGA GCG
B) ATC GCT CGC
C) AUC GCU CGC
D) TUC CGU CGC
Although there are a limited number of amino acids, many different types of proteins exist because the:
1.
size of a given amino acid can vary
2. Chemical composition of a given amino acid can vary
3. Sequence and number of amino acids is different
4. Same amino acid can have many different properties
A base sequence is shown below:
Acagtga
How would the base sequence be coded on mRNA?
1.
TGTCACG
2. GUGACAU
3. UGUCACG
4. CAUGUA
Which base is normally used in the synthesis of RNA but NOT in the synthesis of DNA?
1 adenine
2. Uracil
3. Cytosine
4 Guanine
A sequence of three nitrogenous bases in a messenger-RNA molecule is known as a:
1.
codon
2. gene
3. poylpeptide
4. nucleotide
3)
Proteins are complex molecules composed of chains of what sub-units?
A) fatty acids
B) carbohydrates
C) oils
D) amino acids
Which sequence of amino acids would the following
mRNA make UGU AUC GAC?
mRNA
Amino Acid
UAU , UAC
Tyrosine
CCU, CCC, CCA, CCG
Praline
GAU, GAC
Aspartic acid
AUU, AUC, AUA
Isoleucine
UGU, UGC
cysteine
A) tyrosine, aspartic acid, cysteine
B) cysteine, isoleucine, aspartic acid
C) cysteine, aspartic acid, isoleucine
D) tyrosine, cysteine, aspartic acid