Cell Growth and Division

As a cell increases in size the surface area to volume ratio

• doesn't change

• increases

• decreases

Living cells store critical information in a molecule known as DNA. As a cell grows, that information is used to build the molecules needed for cell growth. As the cell gets bigger a problem arises because the the amount of DNA does not increase so this causes an information crisis in the cell.

• True

• False

Tags

NGSS.HS-LS1-4

________cells are more efficient at exchanging materials across the cell membrane because they have a greater surface area to volume ratio.

• Larger

• Smaller

Growing cells solve the problems of DNA overload and inefficient materials exchange by

• dying

• dividing

• doubling

Tags

NGSS.HS-LS1-4

For many single-celled organisms, such as a bacterium, cell division is the only form of reproduction they can use. This is known as __________________________.

• Asexual reproduction

• Sexual reproduction

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NGSS.MS-LS3-2

Cells hold a lot of DNA. In fact, the total length of

this bacterium’s DNA molecule is 1.6 mm, roughly 1000 times longer than the cell itself. The only way the cell can manage all this genetic material is to package it very carefully. DNA is packaged in __________________ .

• genes

• lysosomes

• chromosomes

• molecules

Tags

NGSS.HS-LS1-4

Eukaryotic chromosomes are made of chromatin (DNA wrapped up around proteins). Why do cells go to such lengths to package their DNA into chromosomes?

• So the cell can keep all the genetic material together

• So the genetic material looks pretty

• So the genetic material can be separated equally when a cell divides

Tags

NGSS.HS-LS1-4

Which organism would have a simple cell division cycle like the one pictured above?

• humans

• eukaryotes

• bacteria

Eukaryotes have a cell cycle that consists of four main phases. They are

• Interphase, M, G1 and cytokinesis

• G1, S, G2 and M phase

• Interphase, G2, M phase and DNA synthesis

Tags

NGSS.HS-LS1-4

During which phase of the cell cycle is the DNA copied so that each new cell will have a complete copy of genetic material?

• G2 Phase

• G1 phase

• S phase

• M phase