Cell Transport

Homeostasis refers to

• the similarity of genetic traits to one another.

• the tendency of a cell to maintain a stable internal environment.

• the effect of natural selection on human evolution.

• a mixture or solution that is the same throughout.

Tags

NGSS.MS-LS1-3

What is pictured?

• cell wall

• cell membrane

• nucleus

• mitochondria

Tags

NGSS.MS-LS1-2

Diffusion is

• the movement of molecules out of a cell

• the movement of molecules from a high concentration to a low concentration

• the movement of water only

• the movement of water from low concentration to high concentration

Cell membranes are selectively permeable. This means that

• any substance can move across the cell membrane, but chemical energy will always be required.

• only water can move freely across the cell membrane.

• some substances can move freely across the cell membrane, while others must be transported.

• no substances can move freely across the cell membrane.

Tags

NGSS.MS-LS1-2

If a plant is placed in a solution that has a higher solute concentration than its cells, then we expect the cells of the plant to

• take on water and swell

• take on solute and swell

• lose water and shrink

• lose solute and shrink

Tags

NGSS.MS-LS2-1

If a decalcified egg is placed in corn syrup, why does the syrup itself not go into the cell?

• the cell wall keeps it out

• the cell membrane is selectively permeable

• the yolk goes out into the syrup

• the shell is too thick

Tags

NGSS.MS-LS1-2

Osmosis is the process in which _______ diffuses across a cell membrane.

• salt

• sugar

• water

• protein

Osmosis involves the movement of water molecules across a cell membrane. Diffusion involves the movement of substances other than water across a cell membrane. In both of these processes, substances move from an area of high concentration to an area of low concentration. Thus, both diffusion and osmosis are forms of _______.

• structural repair

• facilitated transport

• passive transport

• active transport

• photosynthesis

In some circumstances, your cells need a surplus of certain molecules. IN order to do this they move them from an area of low concentration to an area of high concentration. This is called going up the concentration gradient. It requires energy. This is called

• passive transport

• cell respiration

• active transport

• friction

A cell's membrane is composed of two layers of lipid molecules. What is the main function of a cell membrane?

• construct long chains of amino acids

• . store energy for later use

• control what enters and exits the cell

• direct the functions of the cell's organelles

Tags

NGSS.MS-LS1-2