Ch.1 - Ch. 6

Which organelle is involved in the formation of spindle fibres?

• Nucleus

• Ribosome

• Lysosome

• Centriole

What is the effect to the cell if there is no smooth endoplasmic reticulum?

• No energy product

• No synthesis of lipids

• No synthesis of protein

• No modification of protein

An experiment shows the plasma membrane of red blood cell loses its shape when immersed in 1.5% sodium chloride solution. What causes the red blood cell to lose its shape?

• Water diffuses into the cell by diffusion.

• Water diffuses out of the cell by osmosis.

• Sodium chloride diffuses into the cell by active transport.

• Sodium chloride diffuses out of the cell by facilitated diffusion.

The graph shows the effect of substrate concentration on the rate of reaction. Which of the following conclusions can be deduced from the graph?

• Enzyme concentration is the limiting factor at level Z.

• When the concentration of substrate is increased from X to Y, more substrate molecules are available to bind with the active side of the enzymes.

• At concentration Y, no more reaction takes place as all the active sites of enzymes are fully saturated.

• Rate of reaction at level Z can be increased if more substrate is added in the reaction.

What are X and Y?

• X : Mitosis

  Y: Meiosis

• X : Fertilisation

  Y: Meiosis

• X : Meiosis

  Y: Mitosis

• X : Fertilisation

  Y: Mitosis

Diagram above shows events of phase X in a cell cycle.

What is phase X?

• G1

• G2

• Mitosis

• Cytokinesis

Diagram above shows the mechanism of enzyme action.

Which part labelled A, B, C or D represents the substrate?

• A

• B

• C

• D

Which structure A, B, C or D controls the movement of substances into and out of the cell?

• A

• B

• C

• D

Name the following structures:

Cell S →

Based on the results of the experiment, what is the characteristic shown by L?

• less permeable

• semi-permeable

• non-permeable

• fully permeable