OCR 21st Century Science
Unit B5 Key Words
DNA and Mitosis & Meiosis
1
Chromosomes
2
Genes
3
Nucleus
4
Organelles
5
6
Mitosis
Meiosis
7
Ribosomes
8
Mitochondria
9
Gametes
10
Genetic variation
11
Double helix
Base pairing
Amino acids
12
13
14
15
Proteins
Daughter cells
17
Haploid
Asexual reproduction
18
Sexual reproduction
16
Cell division that makes two new cells identical
to each other and to the parent cell
Differences between individuals caused by
differences in DNA
Long thin threadlike structures in the nucleus
of the cell made from a molecule of DNA.
They carry genes
An organelle where respiration takes place and
where energy is made
The shape of a DNA molecule
The small molecules that are joined in long
chains to make proteins
Cell division that halves the number of
chromosomes to produce gametes. The four
new cells are genetically different from each
other and from the parent cell
Sex cells that fuse together to for a zygote
(sperm and egg)
Chemicals in living things made up of amino
acids
A section of DNA giving instruction for a cell
about how to make one kind of protein
A nucleus with half the amount of DNA
The name of cells after cell division
Central structure in a cell containing genetic
material. It controls the function and
characteristics of the cell
Reproduction involving one parent
The specialised parts of a cell such as the
nucleus and mitochondria. Chloroplasts are
organelles that are only found in plant cells
An organelle in a cell where proteins are built
The bases in a DNA molecule (A C G T) always
bond in the same way. A & T and C & G
Reproduction involving two parents
OCR 21st Century Science
Unit B5 Key Words
DNA and Mitosis & Meiosis
1
Chromosomes
2
Genes
3
Nucleus
4
Organelles
5
6
Mitosis
Meiosis
7
Ribosomes
8
Mitochondria
9
Gametes
10
Genetic variation
11
Double helix
Base pairing
Amino acids
12
13
14
15
Proteins
Daughter cells
17
Haploid
Asexual reproduction
18
Sexual reproduction
16
Cell division that makes two new cells identical
to each other and to the parent cell
Differences between individuals caused by
differences in DNA
Long thin threadlike structures in the nucleus
of the cell made from a molecule of DNA.
They carry genes
An organelle where respiration takes place and
where energy is made
The shape of a DNA molecule
5
10
1
8
11
The small molecules that are joined in long
chains to make proteins
Cell division that halves the number of
chromosomes to produce gametes. The four
new cells are genetically different from each
other and from the parent cell
Sex cells that fuse together to for a zygote
(sperm and egg)
Chemicals in living things made up of amino
acids
A section of DNA giving instruction for a cell
about how to make one kind of protein
A nucleus with half the amount of DNA
13
The name of cells after cell division
15
Central structure in a cell containing genetic
material. It controls the function and
characteristics of the cell
Reproduction involving one parent
3
6
9
14
2
16
17
The specialised parts of a cell such as the
nucleus and mitochondria. Chloroplasts are
organelles that are only found in plant cells
An organelle in a cell where proteins are built
4
The bases in a DNA molecule (A C G T) always
bond in the same way. A & T and C & G
Reproduction involving two parents
12
7
18