WorksheetsExploring DNA Structure and Function
Total questions: 24
Worksheet time: 15mins
What is the shape of the DNA molecule?
Double helix
Single strand
Triple helix
Circular
Which of the following is NOT a nitrogenous base found in DNA?
Adenine
Thymine
Uracil
Guanine
What sugar is found in the backbone of DNA?
Glucose
Ribose
Deoxyribose
Fructose
Which base pairs with cytosine in DNA?
Adenine
Thymine
Guanine
Uracil
What type of bond holds the two strands of DNA together?
Ionic bonds
Hydrogen bonds
Covalent bonds
Metallic bonds
Which component forms the "rungs" of the DNA ladder?
Phosphate groups
Nitrogenous bases
Deoxyribose sugars
Ribose sugars
How many strands make up a DNA molecule?
One
Two
Three
Four
Which of the following is a purine base in DNA?
Thymine
Cytosine
Adenine
Uracil
What is the full form of DNA?
Deoxyribonucleic acid
Dioxyribonucleic acid
Deoxyribose nucleic acid
Deoxyribonitric acid
What would happen if a mutation changed an adenine to a cytosine in a DNA strand?
The base pairing would remain the same
The base would now pair with guanine instead of thymine
The base would pair with uracil
The DNA would become single-stranded
Which part of the nucleotide is responsible for the negative charge of DNA?
Nitrogenous base
Phosphate group
Deoxyribose sugar
Hydrogen bond
If a DNA molecule is heated, what is most likely to happen first?
The sugar-phosphate backbone breaks
The hydrogen bonds between bases break
The bases are removed from the backbone
The DNA forms a triple helix
Which of the following best explains why DNA replication is called "semi-conservative"?
Each new DNA molecule has two new strands
Each new DNA molecule has one old and one new strand
Both strands are completely new
Only one strand is copied
Which of the following best describes the directionality of DNA strands?
Both run 5' to 3'
Both run 3' to 5'
They run antiparallel to each other
They are circular
Which of the following would most likely result from a change in the sequence of bases in DNA?
The shape of the DNA molecule changes
The genetic information is altered
The sugar-phosphate backbone is broken
The DNA becomes RNA
A DNA molecule is found to have 28% adenine. What is the percentage of guanine in the molecule?
22%
28%
44%
72%
A mutation causes a change in the DNA sequence from 5'-ATG-3' to 5'-ACG-3'. What is the effect on the complementary strand?
No change
The complementary base changes from T to C
The complementary base changes from C to G
The complementary base changes from T to G
A scientist is comparing the DNA of two organisms. What evidence from the DNA structure could be used to determine how closely related the organisms are?
The number of chromosomes
The sequence of nitrogenous bases
The amount of deoxyribose sugar
The length of the DNA molecule
If a mutation causes a change in the DNA sequence, how might this affect the protein produced?
The protein will always be shorter
The protein may have a different sequence of amino acids
The protein will not be affected
The protein will become DNA
Label the nucleotide
Phosphate
Sugar
Nitrogenous base
Select ALL the Phosphate Group
Which part is the building block of DNA?
Tap on the part of DNA that is the sugar-phosphate backbone
