DNA (Grade 10)
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DNA
1.
What kind of structure is the molecule shown in the diagram?

- multi-strand
- ladder
- double helix
- double vertex
2.
Which nitrogen bases pair up in a DNA molecule?
- A-T and C-G
- A-C and T-G
- A-U and G-C
- A-G and T-C
3.
DNA replication occurs in
- the S phase of interphase in both somatic and reproductive cells.
- metaphase of meiosis only.
- the G1 phase of interphase in reproductive cells only.
- the cytokinesis portion of the cell's life cycle.
4.
Which scientists are credited with discovering the physical structure of DNA?
- Watson and Crick
- Einstein and Crick
- Mendel and Watson
- Holmes and Watson
5.
Nucleotides of DNA are composed of three substances, namely
- calcium, sugar, and nitrogen.
- sugar, phosphate, and nitrogenous base.
- sugar, hydrogen, and nitrogen base.
- phosphate, calcium, and nitrogenous base.
6.
Which four nitrogenous bases are found in DNA?
- guanine, cytosine, adenine, thymine
- guanine, uracil, adenine, cytosine
- both a and b
- none of the above
7.
A strand of DNA is exposed to intense heat. Which statement BEST describes what will happen to the strand of DNA?
- The chemical bonds of the DNA molecule will be broken.
- More nitrogen base pairs will add on to the DNA molecule.
- The chemical bonds of the DNA molecule will be strengthened.
- The nitrogen base pairs in the DNA molecule will switch places.
8.
What is the role of hydrogen bonds in the structure of DNA?
- code for proteins
- synthesize proteins
- separate the strands
- connect the base pairs
9.
DNA stands for .
10.
In the diagram above, what sugar makes up the part of the structure labeled by the number 2?
- deoxyribose
- ribose
- starch
- glucose
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