2127796
Descripción
Test por Georgia Knight, actualizado hace más de 1 año
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Creado por Georgia Knight
hace alrededor de 9 años
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Pregunta 1
Pregunta
DNA is the chemical that determines inherited characteristics and it contains vast amounts of information in the form of genetic code
Respuesta
- True
- False
Pregunta 2
Pregunta
What is the structure of a DNA molecule?
Respuesta
-
helical
-
double helix
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pleated sheet
Pregunta 3
Pregunta
What three components is a nucleotide of DNA made up of?
Respuesta
-
a variable group
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a phosphate group
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a deoxyribose sugar
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an organic base (C, T, A or G)
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a hydrocarbon
Pregunta 4
Pregunta
The single ring bases are?
Respuesta
-
C
-
G
-
A
-
T
Pregunta 5
Pregunta
The double ring bases are?
Respuesta
-
C
-
G
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A
-
T
Pregunta 6
Pregunta
DNA is made up of two strands of polynucleotides. How do the nucleotides join to become polynucleotides?
Respuesta
-
Hydrogen bonds
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Condensation Reaction between phosphate group of one nucleotide and deoxyribose of another.
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Polar attraction
Pregunta 7
Pregunta
Which base does cytosine pair with?
Respuesta
-
adenine
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thymine
-
guanine
Pregunta 8
Pregunta
What base does thymine pair with?
Respuesta
-
adenine?
-
guanine?
-
cytosine?
Pregunta 9
Pregunta
The organic bases form the structural backbone of DNA
Respuesta
- True
- False
Pregunta 10
Pregunta
What is the function of DNA?
Respuesta
-
To pass genetic information from cell to cell and generation to generation.
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To provide energy for the cell.
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To make organic bases.
Pregunta 11
Pregunta
How is the DNA molecule adapted to carry out its functions? (4 points)
Respuesta
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It is very stable and can pass from generation to generation without changing.
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It is flexible so can be easily changed.
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It's two strands are only joined with H bonds which allow them to separate for DNA replication.
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The two strands are joined with H bonds that are strong and prevent the strands from separating.
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The molecule is extremely large so carries an immense amount of genetic information.
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The structural backbone protects the genetic information from corruption.
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The molecule is very small so lots of them can fit in a small space.
Pregunta 12
Pregunta
What is a gene?
Respuesta
-
A sequence of DNA bases that determines a polypeptide (a sequence of amino acids).
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A molecule that contains all the genetic information of a cell.
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A substance made up of DNA
Pregunta 13
Pregunta
What are introns?
Respuesta
-
Sections of DNA that don't code for amino acids.
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Amino acids.
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Three bases that code for an amino acid.
Pregunta 14
Pregunta
The triplet code can be read in either direction of the DNA strand
Respuesta
- True
- False
Pregunta 15
Pregunta
The start of a sequence of the triplet code is always the same: the amino acid 'methionine'.
Respuesta
- True
- False
Pregunta 16
Pregunta
Stop codes are triplet codes that don't code for an amino acid, but the end of a polypeptide chain.
Respuesta
- True
- False
Pregunta 17
Pregunta
The triplet code is only specific to humans.
Respuesta
- True
- False
Pregunta 18
Pregunta
Prokaryotic cells don't have chromosomes as their DNA molecules are smaller and not associated with protein molecules
Respuesta
- True
- False
Pregunta 19
Pregunta
Chromosomes are visible all the time.
Respuesta
- True
- False
Pregunta 20
Pregunta
The DNA helix is wound around proteins to hold it in position.
Respuesta
- True
- False
Pregunta 21
Pregunta
A chromosome contains a single molecule of DNA.
Respuesta
- True
- False
Pregunta 22
Pregunta
How many chromosomes do humans have?
Respuesta
-
78
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46
-
23
-
48
Pregunta 23
Pregunta
A homologous pair of chromosomes determine the same genetic characteristics.
Respuesta
- True
- False
Pregunta 24
Pregunta
What are different forms of a gene called?
Respuesta
-
alleles
-
chromosomes
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haploid cells
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