Robert Hooke was the first scientist to observe cells using a light microscope. His study led to

• the discovery of bacteria as pathogens.

• the discovery of sub-cellular structures.

• the development of the cell theory.

• the invention of electron microscopes.

A student uses a light microscope to examine a specimen of cells. If he wants to observe more cells within the field of view, he should

• stain the cells with a suitable dye.

• change to an objective with a lower magnification.

• turn the coarse knob to reduce the distance between the specimen and the objective.

• adjust the iris diaphragm.

Which cell structure(s) can be seen with a light microscope at 400x magnification?

(1) cell wall

(2) mitochondrion

(3) chloroplast

• (1) only

• (1) and (2) only

• (1) and (3) only

• (1), (2) and (3)

Which of the following organelles is not bound by a double membrane?

• mitochondrion

• chloroplast

• nucleus

• vacuole

The diagram shows the structure of a plant cell.

Which structure(s) can be used to distinguish the plant cell from an animal cell?

• 1 and 7 only

• 3 and 7 only

• 1, 4 and 7 only

• 3, 4 and 7 only

The diagram shows the structure of a plant cell.

Which structure(s) is / are differentially permeable?

• 6 only

• 4 and 6 only

• 6 and 7 only

• 4, 6 and 7 only

The diagram shows the structure of a plant cell.

Which structures of the cell carry out the functions below?

• Synthesizes carbohydrates: 1; Prevents the entry of excess water: 6

• Synthesizes carbohydrates: 1; Prevents the entry of excess water: 7

• Synthesizes carbohydrates: 2; Prevents the entry of excess water: 6

• Synthesizes carbohydrates: 2; Prevents the entry of excess water: 7

The table shows some characteristics of four cells.

Which cell is most likely a bacterial cell?

• P

• Q

• R

• S

The table shows some characteristics of four cells.

Cell P is a eukaryotic cell because

(1) it has endoplasmic reticulum.

(2) it has ribosomes.

(3) it has a cell wall.

• (1) only

• (1) and (2) only

• (1) and (3) only

• (1), (2) and (3)

What are the levels of organization in an organism?

• organism → cells → organs → tissues → systems

• tissues → cells → organs → systems → organism

• cells → organs → systems → tissues → organism

• cells → tissues → organs → systems → organism