Worksheets10 Genetics - DNA
Total questions: 9
Worksheet time: 5mins
Which is not a characteristic of DNA - deoxyribonucleic acid?
composed of two chains that coil around each other to form a double helix
carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses
made up of smaller molecules called
nucleotides
releases energy via aerobic respiration
Nucleotides consist of
Nitrogen rich base
deoxyribose sugar
chromosome
phosphate group
The nucleotides are organised in a way that makes DNA a double helix - like that of a twisted rope ladder. The uprights of the ladder are made of alternating ___________ and _________ groups
lipid and deoxyribose
phosphate and sugar
sugar and nitrogen rich base
mitochondria and phosphate
The nitrogen-rich bases pair up to form the rungs of the double helix. The four bases adenine (A), thymine (T), guanine (G) and cytosine (C) all have different chemical structures and shapes that means that they can only pair up in one way, a known as ____________________ pairing.
centromere chromatid
homologous chromosome
complementary base
cross hybrid
According to complementary base pairing a section of nucleotides of DNA - CGTAAGTCC, would pair with
GCATTGAGG
GCATTCAGG
CGATTCAGG
TCATTCAGG
Long, thin, thread-like structures found in the nuclei of all cells [that contain a nucleus]
nucleotide
deoxyrybose
gene
chromosome
There are 46 chromosomes in human cells - being 23 homologous pairs. Pair 23 are the sex chromosomes. A female is represented by
X X
Y X
Y Y
X Y
Which of the following is NOT a characteristic of homologous chromosomes
are the same length
the centromere in the same position
the same circular strands of DNA
have genes for particular characteristics at the same location along their length
The order of the bases along the DNA strand is the genetic code. Each gene codes (contains instructions) for a specific
lipid
DNA
protein
nucleotide
