IB Biology SL

The salt concentration inside an animal cell is 1.8 %. The salt concentration in the surrounding medium becomes 5 %. What will be the likely response?

• A. The cell will gain water from the medium.

• B. The cell will lose salt to the medium.

• C. The cell will remain unchanged.

• D. The cell will shrink from loss of water.

What is osmosis?

• The movement of water through a membrane from a low to a high solute concentration

• The movement of solutes through a membrane from a high to a low water concentration

• The movement of water through a membrane from a high to a low solute concentration

• The movement of solutes through a membrane from a low to a high water concentration

Which movement occurs by osmosis?

• A. Oxygen from alveoli into the blood

• B. Water from a leaf into the atmosphere

• C. Water from soil to root

• D. Nitrate ions from soil to root

Tags

NGSS.MS-LS2-1

What route is used to export proteins from the cell?

• A. Golgi apparatus → rough endoplasmic reticulum → plasma membrane

• B. Rough endoplasmic reticulum → Golgi apparatus → plasma membrane

• C. Golgi apparatus → lysosome → rough endoplasmic reticulum

• D. Rough endoplasmic reticulum → lysosome → Golgi apparatus

Why do crop plants dry out when a field is irrigated with water contaminated by sea water?

• A. The plants lose water by active transport.

• B. The plants gain salt by osmosis.

• C. The plants gain salt by diffusion.

• D. The plants lose water by osmosis.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which process requires channel proteins?

• Simple diffusion

• Facilitated diffusion

• Binding of hormones

• D. Exocytosis

Substance that dissolves a solute

Forms when two atoms share electrons unequally

Form when two atoms equally share electrons because neither of the atoms has a higher density of electrons than another

A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other