10.1 Flashcards
two reasons why cells divide rather than continuing to grow
The larger a cell becomes, the more demands the cell places on its DNA, and less efficient in moving nutrients and waste materials across the cell membrane.
Food, water and oxygen enter the cell through its __ and waste products leave in the same way.
surface area
The rate at which this exchange take place depends on
the surface area of the cell.
The rate at which food and oxygen are used up and waste products are produced depends on the
Cells volume
Information crisis
too many demands placed on DNA
Traffic problems
volume grows too fast relative to surface area, material exchange is insufficient
When a growing cell divides, two new daughter cells form. The process by which a cell divides into two new daughter cells is called
cell division.
Before cell division, cell copies all of its DNA. This replication of the DNA solves the problem
of information overload.
Cell division also solves the problem of increasing the size
by reducing cell volume.
The two cells produced are genetically identical to the cell that produced them. This kind of reproduction is called
asexual reproduction
A single parent produces genetically
identical offspring
Sexual reproduction involves the _ of two separate
parent cells.
Fusion
