2015 Prelim Biology PRACTICE Mid Year Exam

Preliminary Biology 2015
Assessment FOR Learning (AFL2)
(this is NOT for a mark, but for practice)

PART A: MULTIPLE CHOICE/SHORT ANSWER
10 Marks
Mark Answers on this page

1. Which of the following is the general equation for aerobic cellular respiration?

A. green plant  plant eater  meat eater

B. water + carbon dioxide  glucose + oxygen

C. Glucose + oxygen  carbon dioxide + water

D. Carbon + oxygen  carbon dioxide + water (plus energy)

2. Why are decomposers so important in an ecosystem?
A. They convert energy from the Sun into a form that can be used by animals
B. They change atmospheric nitrogen into a form that can be used by plants.
C. They release oxygen gas in tot the atmosphere
D. They break down organic material and return nutrients to the soil.

3. Iodine will change from a brown colour to dark blue/black colour when it comes into contact with which chemical substance?
A. glucose
B. starch
C. lipids
D. protein

4. Complete the table below. (4 marks)

Major chemical group found in cells
Use of this chemical group in cellular activities
A)

Lipids

B)

This chemical is arranged into genes – the units of inheritance. It provides the blueprint for the manufacture of proteins and other essential polypeptides.

C)

Proteins

D)

These are the major source of energy for the cell, the simplest being sugars. They also make cell walls in plant cells (cellulose).

5. The main difference between diffusion and osmosis is that:
A osmosis occurs through a semi-permeable membrane, whereas diffusion is the spreading out of particles without a membrane.
B diffusion is passive transport, whereas osmosis is active transport
C diffusion occurs in plants, whereas osmosis occurs in animals
D osmosis is fast, whereas diffusion is slow

6. The currently accepted model that explains the functioning of membranes is the:
A solid diffusion reverse gradient model
B fluid mosaic model
C cholesterol dominated diffusion model
D