DNA+Mitosis

Question 1

Label the three parts of a nucleotide

Answer 1

phosphate = simple sugar
Phosphate group = phosphorus surrounded by 4 oxygen
Nitrogen base = carbon ring containing 1 or more nitrogen

Question 2

What are the base pair rules for RNA and DNA?

Answer 2

Adénine A goes with Thymine T-2 Hydrogen bonds (apple and tree)
Guanine G goes with Cytosine C-3 Hydrogen bonds (car and garage)

Question 3

What is replication and in which phase of phase does it occur?

Answer 3

Réplication - DNA makes a copy of itself, Enzyme zips DNA. Happens in interphase

Question 4

List the phases of the cell cycle

Answer 4

G1 - cell doubles in size
S - DNA replicates, Enzyme unzips
G2 - Rapid cell growth to prepare for Mitosis

Question 5

Describe the cycle of mitosis

Answer 5

A. Prophase: chromosomes condensé and spindle fibers attach to centromere
B. Metaphase: chromosomes line up with spindle fibers
C. Anaphase: spindle fibers pull apart chromosomes breaking centromere
D. Telophase: spindle fibers dissolve and chromatids elongate
Cytokinesis: division of the cytoplasm into two new cells