Binary Fission

Question 1

Prokaryotes reproduce by

Answer 1

a type of cell division called binary fission

Question 2

In binary fission

Answer 2

the chromosome replicated (beginning at the origin of replication) and the two daughter chromosomes actively move apart

Question 3

Mitosis most likely evolved

Answer 3

from binary fission, because prokaryotes evolved before eukaryotes

Question 4

Endosymbiont Theory

Answer 4

an ancestor of the eukaryotic cells engulfed an oxygen using nonphotosynthetic prokaryotic cell. Eventually they formed a relationship becoming endosymbiot. Over evolution they became one organism, eukaryotic cell with the endosymbiont becoming the mitochondrion. One of the cells had taken up photosynthetic prokaryote, becomeing the ancestor of the eukaryotic cells that contain chloroplast.

Question 5

Benign tumors

Answer 5

are not cancerous

Question 6

Malignent tumors

Answer 6

are cancerous, and cane move to other parts of the body

Question 7

How is a normal cell transformed into a cancerous cell?

Answer 7

The proteins involved in regulating cell division events no longer appropriately drive progression from one cell cycle stage to the next. Rather than lacking function, cancer cells reproduce at a rate far beyond the normally tightly regulated boundaries of the cell cycle.

Question 8

When cells grow old, they die, and new cells take their place. Sometimes,

Answer 8

this process goes wrong. New cells form when your body does not need them, and old cells do not die when they should. These extra cells can divide without stopping and may form tumor.

Question 9

In metastasis,

Answer 9

cancer cells break away from the original (primary) tumor, travel through the blood or lymph system, and form a new tumor in other organs or tissues of the body.

Question 10

metastasis is

Answer 10

The spread of cancer cells from the place where they first formed to another part of the body.