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WorksheetsDNA Structure and Genetic Code
Total questions: 13
Worksheet time: 7mins
Which of the following best describes the shape of DNA?
globular
fibrils
A nucleotide is composed of
A phosphate, sugar and nitrogenous base
A protein, sulfur and guanine
A phosphate, lipid and a base
A protein, sugar and nitrogenous base
The bonds that join nucleotides to form DNA and RNA are called:
Glycosidic Bonds
What forms the backbone of the DNA ladder?
nitrogenous bases
deoxyriboses and phosphates
genes & chromosomes
RNA
What makes up the rungs (steps) of a DNA ladder?
sugars & phosphates
nitrogen bases
sugars
genes & chromosomes
Which bonds join the nitrogenous bases in the centre of the DNA strand?
A-T, G-C
Which sequence of DNA bases would pair with this partial strand?
ATG TGA CAG
Which is larger: guanine or cytosine?
Guanine because it's a purine
Guanine because it's a pyrimidine
Cytosine because it's a purine
Cytosine because its a pyrimidine
How is RNA different from DNA? Select all that apply.
RNA contains the base thymine.
RNA contains the sugar ribose.
RNA contains the sugar deoxyribose.
RNA contains the base uracil.
RNA is single-stranded
