Cell Theory
T/F:
All living things are made of cells
Cells are the basic unit of life
All cells come from other cells= cell division
TRUE
DNA comes in two forms
Chromosomes
Chromatin
What is the cell cycle ?
A. Sequence of growth and division
B. A Cycle of life
A. Sequence of growth and division
What happens in the S phase?
S = DNA copied or synthesized
What is a tumor ?
Mass of growing tissue
Describe cell repair.
When a cell becomes damaged by a cut or bruise, cell division occurs to heal and replace the cells and tissue lost.
Describe what a chromosome is.
Tightly coiled DNA
Made up of 40% DNA and 60% protein
Visible only during cell division
What phases are in the interphase?
G1, S, G2
Cytokinesis- division of the ________.
A. Cytoplasm
B. Nucleus
A. Cytoplasm
What is cell division ?
Cell reproduction.
Describe what a chromatid is.
Loose DNA
Visible during interphase
What happens in the G1 phase?
G1 = cell growth, organelles copied
Mitosis- division of the _________.
A. Cytoplasm
B. Nucleus
B. Nucleus
T/F: Chromatids are two different “sister” parts of a chromosome.
FALSE: Identical “sister” part of a chromosome
Humans have: Humans have
A. 60 chromosomes
B. 10 chromosomes
C. 46 chromosomes
C. 46 chromosomes
What happens in the G2 phase?
G2 = more growth, prepare for mitosis
How many phases are in mitosis ?
FOUR !
Prophase
Metaphase
Anaphase
Telophase