Test
AQA AS Biology 2.8 DNA
Preguntas del test (24)
1DNA is the chemical that determines inherited characteristics and it contains vast amounts of information in the form of genetic code
- AVerdadero
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2What is the structure of a DNA molecule?
- Ahelical
- Bdouble helix
- Cpleated sheet
3What three components is a nucleotide of DNA made up of?
- Aa variable group
- Ba phosphate group
- Ca deoxyribose sugar
- Dan organic base (C, T, A or G)
- Ea hydrocarbon
4The single ring bases are?
- AC
- BG
- CA
- DT
5The double ring bases are?
- AC
- BG
- CA
- DT
6DNA is made up of two strands of polynucleotides. How do the nucleotides join to become polynucleotides?
- AHydrogen bonds
- BCondensation Reaction between phosphate group of one nucleotide and deoxyribose of another.
- CPolar attraction
7Which base does cytosine pair with?
- Aadenine
- Bthymine
- Cguanine
8What base does thymine pair with?
- Aadenine?
- Bguanine?
- Ccytosine?
9The organic bases form the structural backbone of DNA
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10What is the function of DNA?
- ATo pass genetic information from cell to cell and generation to generation.
- BTo provide energy for the cell.
- CTo make organic bases.
11How is the DNA molecule adapted to carry out its functions? (4 points)
- AIt is very stable and can pass from generation to generation without changing.
- BIt is flexible so can be easily changed.
- CIt's two strands are only joined with H bonds which allow them to separate for DNA replication.
- DThe two strands are joined with H bonds that are strong and prevent the strands from separating.
- EThe molecule is extremely large so carries an immense amount of genetic information.
- FThe structural backbone protects the genetic information from corruption.
- GThe molecule is very small so lots of them can fit in a small space.
12What is a gene?
- AA sequence of DNA bases that determines a polypeptide (a sequence of amino acids).
- BA molecule that contains all the genetic information of a cell.
- CA substance made up of DNA
13What are introns?
- ASections of DNA that don't code for amino acids.
- BAmino acids.
- CThree bases that code for an amino acid.
14The triplet code can be read in either direction of the DNA strand
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15The start of a sequence of the triplet code is always the same: the amino acid 'methionine'.
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16Stop codes are triplet codes that don't code for an amino acid, but the end of a polypeptide chain.
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17The triplet code is only specific to humans.
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18Prokaryotic cells don't have chromosomes as their DNA molecules are smaller and not associated with protein molecules
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19Chromosomes are visible all the time.
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20The DNA helix is wound around proteins to hold it in position.
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21A chromosome contains a single molecule of DNA.
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22How many chromosomes do humans have?
- A78
- B46
- C23
- D48
23A homologous pair of chromosomes determine the same genetic characteristics.
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24What are different forms of a gene called?
- Aalleles
- Bchromosomes
- Chaploid cells
Información
- Descripción
- A Levels (Biology) A Levels Test sobre AQA AS Biology 2.8 DNA, creado por Georgia Knight el 25/02/2015.
- Autor
- Georgia Knight
- Idioma
- English
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- 113
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