Main components of phospholipid bilayer

Which of the following is the characteristic of plasma membrane?

Movement of substances from the higher concentration region to the lower concentration region

Which substances can easily diffuse through the phospholipid bilayer without using the pore and carrier protein?

Which of the following statement wrongly describes the fluid mosaic model of a plasma membrane?

All processes taking place across the plasma membrane do not require the breakdown of ATP molecules except:

The absorption of amino acid across small intestine in human body through small projections called villi occurs via __________________.

The diagram shows a complex molecule. Choose the correct statements about this molecule.

I It consists of hydrophilic head and hydrophobic tail.

II These molecules will arrange themselves in two layers called bilayer.

III These molecules will form micelles when dispersed in water

IV It is made in rough endoplasmic reticulum

Choose the wrongly pairs between types of proteins and their functions.

Rahman soaked a chicken egg in a saturated salt solution. After a few days, he found that the egg tasted salty. Which statements explain the phenomenon?

I The egg shell and membrane are permeable to salt

II Salt particles diffuse into the egg

III Salt particles enter the egg by active transport

IV Saturated salt solution is hypotonic to the egg

Which statements are true about active transport?

I It is the movement of particles against the concentration gradient

II It needs an input energy from cell respiration

III It can be inhibited by respiratory poisons such as cyanide

IV Its rate of transporting substances will increase continuously as the respiration rate increases without limitation

Beng Hooi plants the tomato seedling in a pot, water it frequently and add the soil with chemical fertiliser once every day in order to ensure the plant can grow faster. After one week, he notices the plant has wilted. What causes the plant to wilt?

Which part repels water?

Type of transport

A process of water molecules diffuse from a region of low solute concentration to a region of high solute concentration through plasma membrane

Which of the following involves active transport?

1. Vacuole shrinks

2. Plasma membrane and cytoplasm are pulled away from the cell wall

A few potato strips (all were 2.0 cm) were immersed in solutions with different concentration. Which of the following sizes show that the strips were immersed in hypotonic solution?

Sugar and salt solution is hypertonic towards the fruit cells. This causes the water molecules ____________ and fruit becomes _______________

What happens to the red blood cells when placed in distilled water for 10 minutes?

The Diagram shows a flaccid plant cell. Which of the following will cause the plant cell to undergo plasmolysis?

What happen to a plant cell if immersed in a hypotonic solution?