Which of the following does not occur during interphase?

• DNA replication

• Protein synthesis

• Cytokinesis

• An increase in the number of mitochondria

Which events occur during the G1 phase and S phase of the cell cycle?

• A

• B

• C

• D

How can cells in a multicellular organism differentiate?

• They express some of their genes but not others.

• They all have a different genetic composition.

• Different cells contain a different set of chromosomes.

• Different cells do not have some of the genes.

What happens during the G2 stage of interphase?

• Centrioles move to opposite ends of the cell

• Synthesis of proteins

• Sister chromatids separate

• Replication of DNA

Which of the following take(s) place during either interphase or mitosis in animal cells?

I. Re-formation of nuclear membranes

II. Cytokinesis

III. DNA replication

• I only

• I and II only

• II and III only

• I and III only

Answer explanation

Cytokinesis hppens after mitosis

What is the sequence of stages during the cell cycle?

• G1 → S → G2 → mitosis → cytokinesis

• mitosis → G1 → G2 → cytokinesis → S

• G1 → G2 → S → mitosis → cytokinesis

• G1 → G2 → mitosis → cytokinesis → S

How do prokaryotic cells divide?

• By mitosis

• By meiosis

• By budding

• By binary fission

During reproduction in flowering plants an embryo sac is produced, containing one haploid nucleus.

This haploid nucleus divides by mitosis three times.

What is produced?

• One diploid nucleus

• Four diploid nuclei

• Four haploid nuclei

• Eight haploid nuclei

What does therapeutic cloning involve?

• Developing genetically identical cultures of human cells for use in drug testing

• Helping infertile couples to conceive by injecting the father’s sperm into the mother’s egg

• Producing embryonic stem cells for medical use

• Replacing a mutant allele in an embryo to prevent genetic disease

In the following diagram, which pair represents homologous chromosomes?

• 1 and 2

• 3 and 4

• 2 and 5

• 4 and 6

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