Cells and Cell Membranes

A cell that is unable to import substances required to process chemical energy is most likely a result of a malfunctioning of the ____________________.

• cell membrane

• golgi body

• endoplasmic reticulum

• nuclear envelope

Tags

NGSS.MS-LS1-2

Cell membranes are described as selectively permeable. Four students were asked to explain what this means. Which one is correct?

• Student 1: Cell membranes prevent all materials from entering the cell.

• Student 2: Cell membranes only provide structural support for the cell.

• Student 3: Cell membranes regulate which substances can enter and exit the cell.

• Student 4: Cell membranes allow water and water-soluble substances to enter the cell.

Tags

NGSS.MS-LS1-2

Which part of the cell controls the movement of substances?

• mitochondria

• cell membrane

• chloroplast

• nucleus

Tags

NGSS.MS-LS1-7

The thin, semi-permeable membrane that encloses a cell allows nutrients to enter and wastes to be ____________________.

• digested

• recycled

• protected

• removed

Tags

NGSS.MS-LS1-2

All of the following are functions of a cell membrane EXCEPT

• surrounding and protecting the contents of the cell.

• releasing waste products from the cell.

• producing energy for the cell processes.

• allowing gases to enter the cell.

Tags

NGSS.MS-LS1-2

Why are water molecules able to enter the egg but NOT the sugar molecules?

• Sugar molecules are too heavy.

• The holes of the semi-permeable membrane were too small to let sugar molecules through.

• Semi-permeable membranes need energy.

• Semi-permeable membranes must be under pressure to work.

The processes of diffusion AND active transport are both used to...

• break down molecules to release energy

• move molecules into or out of cells of the body

• bring molecules into cells ONLY when they are more concentrated outside of the cell

• move molecules ONLY against a concentration gradient, using ATP molecules

A child with cystic fibrosis has an altered protein in his cells that stops chloride ions from leaving the cells. This protein most likely affects the functioning of

• ribosomes

• mitochondria

• cell membrane

• lysosomes

Tags

NGSS.MS-LS1-3

NGSS.MS-LS3-1

When the number of water molecules outside of the cell is greater than inside the cell, which will most likely occur?

• Molecules of water will NOT MOVE either way.

• Molecules of water will move OUT of the cell.

• Molecules of water will move INTO the cell.

• Molecules of water will EVAPORATE.

Tags

NGSS.MS-LS1-2

Capillary walls are only one layer of cells thick. Passage of oxygen into and out of the capillaries is controlled most by which process?

• collection of waste material

• breakdown of materials

• diffusion of materials

• storage of materials

Tags

NGSS.MS-LS1-3