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The sequence of bases in a nucleic acid is usually expressed in the _______________ direction.
5' to 3'
To which carbon of the sugar in a nucleic acid are the free hydroxyl groups attached?
3'
What principle is necessary to preserve the sequence of DNA during replication?
Complementary base pairing
A nucleotide consists of:
a pentose sugar, attached to a phosphate group and a nitrogenous base
Which enzyme opens and untwists the DNA during replication?
Helicase
Which events take place in DNA replication?
I. Recognition of promoter section
II. Unwinding of DNA double helix
III. Formation of complementary strands by DNA polymerase
II. and III. only
If one side of a DNA molecule contains the following sequence of nucleotides, GCCATGGA, what would the complementary sequence on the other side be?
CGGTACCT
Transcription is initiated when RNA polymerase binds to:
a site on the DNA at the start of a gene
A certain gene codes for a polypeptide that is 90 amino acids long. Approximately how many nucleotides long is the mRNA that codes for this polypeptide likely to be?
270 nucleotides
How many codons that specify amino acids are there in eukaryotes?
61
Which of the following is correct about rRNA?
Provides a site for polypeptide synthesis
Where do replication, transcription and translation occur in eukaryotic cells?
Replication: Nucleus
Transcription: Nucleus
Translation: Cytoplasm
Which of the following statements best describes the function of tRNA?
Transports amino acids to the ribosome
Which of the following is not directly associated with translation?
DNA
The sequence of the sense strand of DNA is ATTGCACCTA. What would the sequence of the transcribed RNA be?
AUUGCACCUA
In nucleic acids, which type of bond links the 5-carbon sugars with an organic base?
Covalent
Which of the following nitrogenous bases is found in DNA, but is not found in RNA?
Thymine
Which of the following is not found in all nucleotide molecules?
Adenine
The two strands of a DNA double helix are held together by:
Hydrogen bonds
Which one of the following proportions is true for DNA?
C = G
IN DNA, adenine always pairs with:
thymine
IN RNA, adenine always pairs with:
uracil
DNA is made up of a phosphate group, an organic base, and ___________.
a sugar
In the RNA molecule:
Adenine pairs with Uracil
Analysis of the DNA of an organism reveals that it is composed of 20% T (thymine). Based on this information, what would you predict the % C (cytosine) to be?
30%