The twisted ladder
Stop copying me!
Hermes
The master builder
X-men
100
Which is true of DNA?
A. The nitrogenous bases are exposed to the outside of the double helix
B. The only type of bonds that hold together the two strands are hydrogen bonds
C. It is made up of two strands, held together by strong hydrogen bonds
D. The phosphate groups are inside of the double helix structure
C. It is made up of two strands, held together by strong hydrogen bonds
100
What is the role of helicase in DNA replication?
break the hydrogen bonds between bases unzipping the DNA to allow replication to occur
100
What enzyme adds free nucleotides to the growing mRNA during transcription? Note: this enzyme also unwinds the double helix during transcription.
RNA polymerase
100
Which type of RNA carries an amino acid to the ribosome?
tRNA
100
DNA can become damaged by
•Chemicals
•Radioactivity
•X-rays
•Ultraviolet (UV)
•Chemicals in cigarette smoke
200
What is the main difference between the 4 DNA nucleotides?
a. Only the nitrogenous bases are different
b. They are all identical
c. Only A and T have a phosphate
d. Some contain ribose and some contain deoxyribose
a. Only the nitrogenous bases are different
200
DNA replication occurs during which part of the cell cycle?
A. Interphase G1
B. Mitosis
C. Interphase S phase
D. Anaphase
Interphase S phase
200
RNA polymerase continues until the ____________________ is reached.
terminator
200
Proteins are link between _____________ & ________________ - determine what traits show up in the offspring.
genotype; phenotype
200
A point mutation that results in a stop codon.
Nonsense mutation
300
A nucleotide is composed of:
A sugar, a phosphate group, and a nitrogenous base
300
If a parental DNA strand has the following sequence: TTTACGCA, what is the sequence of the complementary daughter strand?
AAATGCGT
300
A promoter is the region of a gene where ________________________ begins.
transcription
300
What is the role by rRNA in translation?
Ribosomal RNA (rRNA) – forms part of the ribosome - binds the tRNA and the mRNA to the ribosome.
300
A point mutation that results in a codon that indicates a different amino acid.
Missense mutation
400
In the diagram, _______________ bonds hold A and T together while ______________ bonds hold sugar and phosphate groups together.
hydrogen, covalent
400
Which enzyme is responsible for proofreading the daughter strands?
a. Polymerase
b. None of the answers are correct
c. Primase
d. Helicase
e. More than one of the answers is correct
a. Polymerase
400
From the following DNA sequence, transcribe the mRNA molecule:
CATGGTATGGATCCC
GUACCAUACCUAGGG
400
Identify the tRNA anticodons from the following mRNA sequence:
AAG CUA AUC
UUC GAU UAG
400
A mutation that involves one nucleotide is called
a. a mutagen.
b. an inversion.
c. a point mutation.
d. a translocation.
c. a point mutation.
500
Which two bases are the double ring structures? Name this group.
Guanine
Adenine
Purines
500
If a dolphin's DNA contains 15% guanine, what percentage of the DNA is made up of adenine AND thymine?
70%
500
Which part of gene expression is shown in this image?
transcription
500
Use the codon wheel to identify the amino acid sequence from the following mRNA molecule:
AUGCGCGGAUCCCCCACCUAG
Met-Arg-Gly-Ser-Pro-threonine-stop
500
During G1, a cell is exposed to radiation which causes a cytosine to change to uracil. What process will be used to repair the damage?
a. The uracil will change back to cytosine on its own
b. Mismatch repair
c. The DNA cannot be repaired
d. Proofreading
d. Proofreading