Showing posts with label cset study guide. Show all posts
Showing posts with label cset study guide. Show all posts

Monday, November 4, 2013

Photosynthesis

Chemical Equation: 



Photosynthesis is the process in which plants (photosynthetic organisms) take in heat energy (light) and convert it into chemical energy (glucose).

Photosynthesis happens in the chloroplast (a cell organelle), chlorophyll is the the green pigment that captures the light (How to remember: Chloro-Fill fill up with light).

More to know:

Light Reaction (Light Dependent) 
The first stage of photosynthesis occurs in the presence of light. The captured light energy drives the production of ATP. ATP is a cells energy currency. REQUIRES LIGHT!

Dark Reaction (Calvin Cycle) DOES NOT REQUIRE LIGHT
This stage is called dark reaction (Calvin Cycle) 
A series of chemical reactions that occur in the stroma. 

Sunday, November 3, 2013

Mitosis

Mitosis is a process of cell division for growth and repair. Not to be confused with meioses (meiosis involves sex cells for reproduction). In mitosis you  end up with two daughter cells, each identical to the original.

Quiz: Mitosis




FYI: Microtubules are also called spindle fibers

This is how I remember mitosis:
Mi-TOE-sis: my toe is not a sex organ 

This is how I remember the stages of mitosis:
PMAT

Interphase: this is the normal state of a cell. A cell spends most of its life in this state 

Prophase: DNA condenses into chromosomes, nuclear envelope around DNA begins to disappear. 

Metaphase: Chromosomes line up at the center of the cell. Centrioles move to opposite ends of the cell. Spindle fibers move across the cell and connect to centromeres of each chromosome. The centromere is the center of the chromosome. See the picture. 

Anaphase: While in the anaphase stage of mitosis the centrioles will begin to pull each chromosome into two halves called sister chromatids. Each chromatid contains the same information.

Telophase (Cytokinesis happens during this phase - it's the part were the cell splits)Finally in the Telophase stage of mitosis the nuclear membrane forms around the chromatids and they are completely located at opposite ends of the cell.

Cytokenisis: Usually after Telophase the cell will also divide its cytoplasm and pinch off into two separate but identical daughter cells. Each daughter cell is an exact copy of the parent cell before the DNA was duplicated during Interphase.