Cell Division and Reproduction
88 questions· page 1 of 9
Which statement about nuclear division is correct?
Options
A Meiosis results in the production of cells for the growth and repair of organisms.
B Meiosis results in genetically different daughter cells.
C Mitosis gives rise to cells where the chromosome number is halved.
D Mitosis results in the production of four daughter cells.
Stem cells are found in human embryos.
Which statements about stem cells are correct?
- Stem cells are unspecialised cells.
- Stem cells can divide by mitosis.
- Stem cells are haploid.
Options
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only
A muscle cell from a horse contains 64 chromosomes.
How many chromosomes are there in a sperm cell from a horse?
Options
A 23
B 32
C 64
D 128
Chromosomes, DNA molecules and genes are pieces of inherited material with different sizes.
Which statement describes the relationship between these pieces of inherited material?
Options
A A chromosome is larger than a gene.
B A gene is larger than a chromosome.
C Multiple chromosomes make up a DNA molecule.
D Multiple DNA molecules make up a gene.
During the division of a nucleus by meiosis, changes can happen that produce a gamete with an abnormal number of genes or an abnormal number of chromosomes.
Which change can result in a child having Down's syndrome?
Options
A a gamete with one extra chromosome
B a gamete with one less gene
C a gamete with one less chromosome
D a gamete with one extra gene
Bacteria reproduce by splitting into two. This can happen every 20 minutes in ideal conditions of sufficient water, food and at a warm temperature. Small numbers of bacteria do not usually make people ill.
When a student takes her lunch out of the fridge, it contains 4 bacteria. After 2 hours at room temperature, it contains 256 bacteria.
From the time that the food is taken out of the fridge, how long will it take before there are 16 384 bacteria in her food?
Options
A 2 hours
B 3 hours
C 4 hours
D 5 hours
The diagrams show some plant and animal cells. They are not drawn to the same scale.
Which cells contain haploid nuclei?
Options
The diagram shows the life cycle of a species of plant.
During which stage does meiosis (reduction division) occur?
Options
A A
B B
C C
D D
What is an advantage of sexual reproduction in plants?
Options
A It is faster than asexual reproduction.
B Offspring show genetic variation.
C Only one parent is needed.
D Pollinators are not needed.
A seaweed lives in shallow water around the coast. Stages in its life cycle are shown.
At which stages in the life cycle are its cells diploid?
Options
A 1, 2, 3 and 4
B 1, 3 and 4 only
C 2 and 3 only
D 2 only