Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
What is a semi-permeable membrane?
|
A membrane that chooses what enters/exits its cell.
|
|
|
What are phospholipids?
|
-Hydrophobic and hydrophilic portions of the cell.
|
|
|
What are two jobs of proteins?
|
Act as channels, communicate
|
|
|
What is diffusion?
|
The movement of molecules from a high concentration to a low concentration.
|
|
|
If there is a 27% concentration of sugar inside of a cell, and an 8% concentration of sugar outside of the cell, which way will the sugar diffuse?
|
Outside.
|
|
|
What is the difference between diffusion and facilitated diffusion?
|
Diffusion: when particles move from an area of high concentration to an area of lower concentration.
Facilitated diffusion: when molecules that cannot directly diffuse across the membrane pass through special protein channels. |
|
|
Where is there a higher concentration of solutes in an ISOTONIC solution?
|
Equal.
|
|
|
Where is there a higher concentration of solutes in a HYPERTONIC solution?
|
Inside.
|
|
|
Where is there a higher concentration of solutes in a HYPERTONIC solution?
|
Outside.
|
|
|
Where will water move in an ISOTONIC solution?
|
There is no movement.
|
|
|
Where will water move in HYPOTONIC solution?
|
Into the cell.
|
|
|
Where will water move in a HYPERTONIC solution?
|
Out of the cell.
|
|
|
What will happen to an animal and plant cell in an ISOTONIC solution?
|
Animal: nothing
Plant: wilts |
|
|
What will happen to an animal and a plant cell in a HYPOTONIC solution?
|
Animal: swells and explodes
Plant: nothing |
|
|
What will happen to an animal and a plant cell in a HYPERTONIC solution?
|
Animal: shrivels
Plant: shrivels |
|
|
What is active transport?
|
The movement of materials against a concentration difference.
|
|
|
Why will a carrot placed in water gain mass?
|
Because water in going into the carrots' cells.
|
|
|
Why will a carrot placed in salty water lose mass?
|
Because water leaves the cells and salt shrivels the cells.
|
|
|
What happens in prophase?
|
Proteins attach to the centromeres and chromosomes. Chromosomes are pulled into the middle of the cell.
|
|
|
What happens in metaphase?
|
Spindle fibers line up the chromosomes. They are duplicated.
|
|
|
What happens in anaphase?
|
The paired chromosomes separate and are pulled to opposite sides of the cell.
|
|
|
What happens in telophase?
|
Chromatids arrive at opposite poles of the cell. New membranes form around the daughter nuclei.
|
|
|
Why do cells need to divide?
|
To make new cells.
|
|
|
What do cells need to make a copy of before dividing?
and Why is this important? |
What: DNA.
Why: Each of the new cells will need to have identical DNA. |
|
|
What is a chromosome?
|
What: Tightly packed packages of DNA.
|
|
|
What is the central goal of mitosis?
|
To make new cells.
|
|
|
What is cytokinesis?
|
When a fiber ring around the center of the cell contracts and pincher the cell into two daughter cells.
|
|
|
What is interphase?
|
When cells use their DNA instructions to make things.
|
|
|
If a cell has 18 chromosomes, how many chromosomes will each of its daughter cells have after mitosis and cytokinesis?
|
18 chromosomes.
|
