interactive questions 04

7/31/2019 Interactive Questions 04

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INTERACTIVE

MULTIPLE CHOICE

QUESTIONS

The answers are provided, but so also are

explanations of why the alternatives are

unsatisfactory

D.G. Mackean

Principles of Biology


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These multiple choice questions are similar to the ones set

by the GCSE and IGCSE Examination Boards except that,in some cases, there may be more than one acceptable

answer.

For this reason, even if you select a correct answer at your

first attempt, it is worth looking at all the alternatives

(a) to see if there is a better answer and

(b) to see why some of the alternatives are unacceptable.

Question 1


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Question 1

The drawings represent stages in division

of an animal cell. a

b

c

d

(a) b, d, a, c

(b) b, d, c, a

(c)b, a, c, d

(d) b, c, d, a

Question 2

Which of the following is the correct

sequence of events?


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Yes

This the correct sequence


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The cell constricts (a) before the cells separate (c)

No


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The nucleus divides (d) before the cell starts to

constrict (a)

No


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The separation into two cells is the final stage

No


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Question 2

The drawing represents a typical leaf cellfrom a plant. What structure or structures

are missing from the drawing?

(a) cell wall

(b) cytoplasm

(c) nucleus

(d) chloroplasts

Question 3


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cell wall

No

The cell wall is present


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cytoplasm

No

The cytoplasm is present


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Yes

nucleus

The nucleus was omitted

from the drawing


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No

The chloroplasts are present

chloroplasts


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Question 3

After being exposed to temperatures ranging from 50-60C,

most enzyme cannot function because

(a) their molecules have been broken down

(b) their molecules have changed shape

(c) their composition has been changed

(d) they cannot separate from their substrate

Question 4


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The molecules remain intact at these temperatures

No


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The molecules have been denatured. That is, their shape

has changed so that they can no longer bind to their

substrate

Yes


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The composition of the enzyme molecule is usually

unaltered at these temperatures

No


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They are unable to combine with their substrate

No


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Question 4

Which of these statements is correct?

The enzyme amylase

(a) breaks down starch and protein

(b) works best at 50C

(c) breaks down starch only

(d) breaks down cellulose

Question 5


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No

Enzymes act on only one type of substrate


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No

Most enzymes are denatured (inactivated) at this

temperature


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Yes

Amylase acts on starch, breaking it down to maltose


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No

The enzyme which breaks down cellulose would

be a cellulase


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Question 5

In biology, the term respiration means

(d) A procedure used to revive a person

who has stopped breathing

(c) releasing energy from carbohydrates by

combing them with oxygen

(b) the release of energy from food substances

(a) the act of breathing

Question 6


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No

The act of breathing is called ventilation. It is a method

of obtaining oxygen for aerobic respiration


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Yes

The release of energy from the breakdown of food

substances, such as glucose, is called respiration


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Partly right

But this definition applies only to aerobic respiration.

Energy can also be released from food by anaerobic

respiration for which oxygen is not needed.


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No

Reviving a person who has stopped breathing is

called resuscitation. In First Aid this is done by the

mouth to mouth method. An outdated method,

depending on compression of the thorax was called

(misleadingly) artificial respiration


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Question 6

Which of the following is NOT reliable evidence of

respiration in a land-dwelling organism

(d) Loss of dry mass

(c) Uptake of oxygen

(b) Production of water vapour

(a) Output of carbon dioxide

Question 7


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This is reliable evidence

The equation for aerobic respiration

C6H12O6 + 6O2 6CO2 + 6H2O

shows that production of carbon dioxide is goodevidence of respiration


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Although the equation for aerobic respiration

C6H12O6 + 6O2 6CO2 + 6H2O

shows that water is a product of respiration it

is not good evidence of respiration because

non-living material can produce water vapour

by evaporation alone

This is not reliable evidence


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The equation for aerobic respiration

C6H12O6 + 6O2 6CO2 + 6H20

shows that uptake of oxygen is goodevidence of respiration.

Admittedly, anaerobic respiration does not

consume oxygen but it seems unlikely that a

land dwelling organism would be usinganaerobic respiration exclusively

This is reliable evidence


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This isreliable evidence

Although the equation

C6H12O6 + 6O2 6CO2 + 6H20

shows glucose as the respiration substrate, almost any

tissues can be used for respiration so a loss in dry

mass means respiration is occurring. It has to be dry

mass to avoid the loss of mass associated with

evaporation


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Question 7

In a green plant, when the rates of respiration andphotosynthesis are equal the plant will be .

(a) taking in carbon dioxide

(d) giving out water vapour

(b) giving out oxygen

(c) taking in carbon dioxide and giving out oxygen

Question 8


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No

The carbon dioxide needed for photosynthesis will

all come from respiration

6CO2 + 6H2O C6H12O6 + 6O2 (photosynthesis)

C6H12O6 + 6O2 6CO2 + 6H2O (respiration)


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No

All the oxygen produced by photosynthesis will be

used for respiration




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No

There will be no net uptake of carbon dioxide or output of

oxygen. All the carbon dioxide needed for photosynthesis

will come from respiration, and the oxygen produced by

photosynthesis will be used in respiration




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There will be no net uptake of carbon dioxide or output

of oxygen. All the carbon dioxide needed for

photosynthesis will come from respiration, and the

oxygen produced by photosynthesis will be used inrespiration. (See previous slide).

However, the plant will be transpiring and there will be a

loss of water vapour

Yes


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Question 8

Which of thestructures in these

palisade cells from

a leaf is responsible

for photosynthesis?

1

2

3

4

(d) 4

(c) 3

(b) 2

(a) 1

Question 9


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Yes

This structure is a chloroplastand is the site of

photosynthesis


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No

This structure is the nucleus. It controls the activities in

the cell but does not photosynthesize


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No

This is the vacuole. It may store sugars produced in

photosynthesis but it does not photosynthesize


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No

This is the cytoplasm. Most of the chemical

processes of the cell occur in the cytoplasm, but not

photosynthesis


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Question 9

Which of the following mineral ions does a plant need

for making proteins?

(a) Phosphate ions

(b) Potassium ions

(c) Nitrate ions

(d) Magnesium ions

Question 10


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No

Phosphate ions are needed for making DNA and for

many enzyme reactions, but do not form part of

proteins


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No

Potassium ions are needed for certain reactions in

the plant cell, including those leading to root

formation, but they do not form part of a protein

molecule


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Yes

Nitrate ions are combined with the carbohydrate

molecules produced during photosynthesis, and form

amino acids and proteins


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No

Magnesium ions are needed for forming chlorophyll but

not for forming proteins


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Question 10

Diffusion of oxygen in air takes place as a result of

(a) convection currents

(b) air movements

(d) changes in temperature

(c) random movement of molecules

Question 11


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No

Convection currents would move the air as a

whole. It would not specifically affect any one

gas in the air


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No

Air movements would affect all atmospheric gases in the

same way


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Yes

Small random movements of oxygen molecules

results in their moving, eventually, from a place where

the molecules are more abundant to places where they

are scarcer, until they are evenly distributed


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No

Changes in temperature affect all the atmospheric

gases. A rise in temperature may speed up diffusion but

not specifically of oxygen


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Question 11

In osmosis, water will diffuse through a partially

permeable membrane

(a) from water to a concentrated solution

(b) from a concentrated to a dilute solution

(c) from a dilute solution to a concentrated solution

(d) from a dilute solution to a more dilute solution


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Yes


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No

The water movement in osmosis is from the dilute

solution to the concentrated solution


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Yes


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No

In osmosis the diffusion of water between solutions is

always from the more dilute solution to the less dilute

(i.e. more concentrated) solution


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