Question

1. during interphase, the cell:

a) divides
b) dies
c) grows and replicates dna
d) shrinks

1. which phase involves dna replication?

a) g1
b) s
c) g2
d) m

1. sister chromatids are produced in:

a) g1
b) s phase
c) g2
d) cytokinesis

1. g1 phase involves:

a) dna division
b) energy and protein accumulation
c) crossing over
d) karyotyping

1. g2 phase includes:

a) dna synthesis
b) cell death
c) preparation for chromosome manipulation
d) meiosis

1. mitosis is:

a) cytoplasm division
b) nuclear division
c) dna damage repair
d) rna synthesis

Explanation:

• Question 15: Interphase is the phase where the cell grows and replicates its DNA in preparation for cell division. Cell division occurs in the M - phase (mitosis or meiosis), cell death is not a normal part of interphase, and cells do not shrink during interphase.
• Question 16: The S - phase (synthesis phase) is specifically for DNA replication. G1 is for cell growth and preparation for DNA replication, G2 is for further growth and preparation for mitosis, and M - phase is for cell division.
• Question 17: Sister chromatids are produced during DNA replication in the S - phase. G1 is before DNA replication, G2 is after DNA replication (sister chromatids are already formed), and cytokinesis is the division of the cytoplasm.
• Question 18: G1 phase involves the accumulation of energy and proteins required for DNA replication. DNA division is not a correct term (DNA replication occurs in S - phase), crossing over occurs in meiosis (prophase I), and karyotyping is a technique to study chromosomes (not a process in G1).
• Question 19: G2 phase is for preparing the cell for chromosome manipulation (mitosis). DNA synthesis occurs in S - phase, cell death is not a normal part of G2, and meiosis is a type of cell division (not a process in G2).
• Question 20: Mitosis is the process of nuclear division. Cytoplasm division is cytokinesis, DNA damage repair can occur in various phases (not specific to mitosis), and RNA synthesis occurs in interphase (transcription).

Answer:

1. C. Grows and replicates DNA
2. B. S
3. B. S phase
4. B. Energy and protein accumulation
5. C. Preparation for chromosome manipulation
6. B. Nuclear division