46 terms

Biology 2.7 Kerboodle Answers

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the sequence of bases in a nucleic acid is usually expressed in what 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?
Base pairing is complementary
A nucleotide consists of
a pentose sugar, attached to a phosphate group and a nitrogenous base
Which enzyme opens and untwist the DNA during replication
Helicase
Which events take place in DNA replication
Unwinding of DNA double helix and formation of complementary strands by DNA polymerase
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
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
Nucleus Nucleus 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
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 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% thymine. Based on this information what would you predict the % cytosine to be?
30%
Two sides of DNA are held together by weak
covalent bonds
replaces thymine in RNA
hydrogen
process of copying DNA
replcation
always pairs with cytosine
guanine
together with Watson discovered double helix of DNA
crick
carries the message of DNA to ribosomes
RNA
always pairs with thymine
adenine
sections of DNA that code for a trait
gene
strands of DNA are
antiparallel
composed of a sugar, a base, and a phosphate
nucleotide
the sugar found in DNA
deoxyribose
the shape of RNA is what helix
single
technique for amplifying DNA in vitro
PCR
valises anticodon is CAU, what is DNA base triplet
CAT
name of sugar found in RNA but not DNA
ribose
process that decodes mRNA into proteins
translation
base triplet in mRNA that specifies a particular amino acid
codon
total number of different bases found in DNA and RNA together
five
section of DNA that forms a particular strand of mRNA
gene
chain of many amino acids linked together
proteins
number of different amino acids coded by DNA in human protein
twenty
enzyme responsable for unwinding the double helix
helicase
organelle site within cell where protein synthesis occurs
ribosome
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