Cell Division: Part A

Which of the following is a correct description of how DNA is organised into chromosomes:

• DNA -> Nucleosomes -> Histones -> Chromatin

• DNA -> Chromatin -> Histones -> Nucleosomes

• DNA -> Histones -> Nucleosomes -> Chromatin

• DNA -> Chromatin -> Nucleosomes -> Histones

In eukaryotic cells DNA must condense into chromosomes, because:

• Completely uncoiled DNA wouldn't fit in the nucleus

• Chromosomes are easier for the spindle fibers to attach to

• Chromosomes provide more structural stability for the DNA

• All of these are correct

Structurally a sister chromatid is the same thing as:

• A replicated chromosome

• An unreplicated chromosome

• Replicated chromatin

• Unreplicated chromatin

How many chromosomes & chromatids are there in the following picture:

• 8 chromosomes/ 4 chromatids

• 8 Chromosomes/ 8 Chromatids

• 4 chromosomes/ 8 chromatids

• 8 Chromosomes/ 0 Chromatids

The following computer model is showing (a):

• Histone

• Chromatin

• 30 nm fiber

• Nucleosome

What function does the H1 (histone 1) protein have in a nucleosome?

• To bind the DNA to the octamer core histone proteins

• To cleave DNA between nucleosomes during mitosis

• To link DNA between nucleosomes

• To prevent DNA damage from mutagens

DNA is attracted to histones because:

• Nucleic acids are naturally attracted to all proteins

• DNA and histones undergo a condensation reaction

• DNA is - and the histone proteins have + amino acids in them

• Linker DNA is a special type of DNA attracted to proteins

DNA replication occurs during _____ phase of Interphase:

• G₁

• G₂

• S

• G₀

The function of mitosis is to:

• Replicate the DNA correctly

• Duplicate the organelles in the cell

• Split the cell into two daughter cells

• Divide the nucleus into two

The cell (centered) below would be in what stage of the cell cycle?

• Interphase

• Metaphase

• Prophase

• Anaphase