Summary
Summary Life at a Molecular Level
- Course
- Grade 12 Life Science
- Institution
- St Stithians College (Stithian)
Detailed summary of life at a molecular level, for grade 12.
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By: PhilipJBotes • 2 year ago
Available practice questions
Flashcards
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Some examples from this set of practice questions
1.
What does DNA stand for?
Answer: Deoxyribonucleic acid
2.
Chromatin
Answer: Chromosomal material made up of RNA, DNA and histone proteins as found in a non-dividing cell.
3.
Extracellular DNA
Answer: Small amounts of DNA are found outside the nucleus in mitochondria and chloroplasts.
4.
What makes up DNA?
Answer: Sugar molecule, phosphate molecule and a nitrogenous base.
5.
What are the four nitrogenous bases?
Answer: Adenine, thymine, guanine and cytosine.
6.
How is the double helix made up?
Answer: Two outer strands of the ladder are formed by a chain of alternating sugar and phosphate links. The rungs of the ladder are formed from pairs of bases linked by weak hydrogen bonds. The base pairs are attached to the sugar molecules.
7.
What does adenine bond with?
Answer: Thymine or uracil
8.
What does cytosine bond with?
Answer: Guanine
9.
Purine
Answer: Made up of two fused rings of nitrogen, carbon and hydrogen atoms. e.g. guanine and adenine
10.
Pyrimidine
Answer: Made up of one ring of similar atoms and are much smaller than purines. e.g. thymine, cytosine and uracil
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