Cape Biology Unit 1 Mutiple Choice 2009

8/10/2019 Cape Biology Unit 1 Mutiple Choice 2009

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CAPE Biology Unit Paper June 2 9

L

Sucrose makes a good transport molecule as

seen in phloem tissue, because it is a

An important propertyof cellulose is its ability

to

3

(A)

disaccharide madeupoftwogiucose

molecu les

disaccharide made up of glucose and

galactose

(A) readily go into solution

(B) act

as

a fuel

s tore

in plants

(C) . readily combine with 0: glucose

CD) form structural components in

plants

(B)

(C) very reactive molecule chemically

and therefore combines easily with

water

0

very

soluble molecule and

can

therefore be moved efficiently in

high concentrations

The arrangement of the polypeptide strands

in collagen isBEST described as

A

. . .

(A)

a

triple helix

(B) an u-helix

(C) a double helix

tT I)

a

J3 -heiix

~ refers to the structures below which

show two isomers of glucose.

I

n

CHpH

tl J-.-----. n AU

'//1. -\.

';'U

H \j

'\.

nu q .

I '--T~I

OHr

I

H

H OH

1

. .

Which ofthe following statements is NOT

tru e abou t

bo th

isomers?

(A) Both have side groups attached to the

first carbon in identical positions.

(B) Both are hexose sugars with the

same chemical formula.

(C) Both formpolysaccharides butwhich

diff er in their properties.

(D)

Both arc soluble in water and can

exist in an open chain form.


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Item

5 refers

to tests performed

by

students to identify food

substances present in a

solution.

The

tests

were

can:ied

out

and their respective

results are

sho~jn

the table below.

i . Test I Result

I Riuret test IPurple colour was obtained.

Benedict's

test

I

Blue

colour remained on neating.

Diiutc hydrochloric acid was added and the I Blue colour became brick-red on

mixture

was boiled, allowed to

cool,

neutralized heating.

and Bcnedict's tcst was carried out.

~

Whl h nflh('

foll,)witl15

indicates the food substance(s) present in the students' solution?

\ A ) I Ilt,1.

1 (11

'11I

(II)

N,1Il I

lu

II)

sugar only

) II

tllllIl IOd non-reducing sugars

(I

I N,H,I

du

'inll

sugar and protein

diagrammatical representation of a

phospholipid molecule.

What do X, Y and Z

l - x - - , - - -

Z

,---------

i

I

LJy

I GlYCer ._.J~h;-O_SP,-h~.~-= t_e_ . _ . _ r - I

: : . F _ a t t y

a~d

iFa~id

i Glycerol j Phosphate

Fatty acid ; Phosphate I Glycerol

I-Phosphate I Glycerol i Fatty acid=----l

______ -L __ I -

(A~

,

(

)

0

7. Inthe

chloroplast, light energy is trapped in the

(A) stroma

(B)

thylakoids

(C) envelope

(D) starch

grain


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Which organelle is involved in cytokinesis in

plant cells?

Item 11 refers to the diagram below.

(A)

B

e

(D)

Golgi apparatus

X External

Endoplasmic reticulum

Internal

surface

Centriole

Chloroplast

Item 9 refers to the diagram below which

shows a transverse section of a plant

structure.

11.

The structure labelled X is

(A) channel protein

(B) cholesterol

(C) extrinsic protein -

(D) glycoprotein

Item 12 refers to the following diagram.

Poiaramino

acid

9

o

I

~ i

.

. . . . . . - .

A r

-

\

'-'

~

Polar amino

acid

Which of the following bonds is T {1 T esen ted

by the broken lines (-) in the diagram above?

The area labelled X represents

(A) acell

G~) a tissue

(C) an organ

(D) a system

10.

Materials are moved in and out of cells by

various

mechanisms. Which of the following

mechanisms are affected

by

respiration?

12.

I.

II.

IIl.

rv

Facilitated diffusion

Osmosis

Active transport

Exocytosis

(A)

(B)

(C)

(D)

Ionic

Double

Peptide

Hydrogen

(A) 1and III only

(B) III and IV only

(C) I,lliandIVonly

(0) II, III and IV only


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T

IT

T> T T'C1

I

&

. .. ..

&.LL y

rf

ate of

I

reaction

\

\

\

.

\

. .

0 1

2

3

4

5

6

7 8

9 10

pH

Reaction

rate

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Item 13 refers to the

graph

below showing

the effect of pH on the activity of enzymes.

Item 14 refers to the

diagram below

\ 1 i

shows the effect of increasing su

concentration on the rate of an e

catalysed reaction.

13.

Chymotrypsin is an enzyme

that

is found in

the human alimentary canal. It is active

over

a na.. TO Wrange of alkaline pH values. Which

of the activity curves represent the activity

of chymotrypsin?

I

I

I

~

Substrate concentration

(A)

(B)

(C)

(0)

I and II only

IandNonly

II and lITony

illandNonly

14.

Which of the labelled curves BES

represents the presence of a comp

inhibitor?

(A) I

(B) II

(C) III

(D) IV


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Item 15 refers to the diagram below which

shows the structure of a triglyceride.

17. What type of bOD~S are used to link

nucleotides

togetherto form

apolynucleotide?

X

ii

-c~

H

I

H.-CX

I

H-C- X

i

I

H- C- X

I

II

(A)

Peptide

(B)

G l t : O S . i d i c

(C) Hydrogen

(D) Phosphodiester

o

II

-c~

18.

Why

is the copied portion of the DNA longer

than

that of

the functional l1.RNA

molecule

produced from it?

.. . , .

A

l l

-C~

(A) The DNA portion contains many

genes.

(B) The DNA

portion contains a

Which

of the following

is

represented by the

label X? (C)

prom oter region

Only exon portions

are

included in

tbemRNA.

Only intron

portions are

included

in

the rnRNA.

(A)

Carbon

B

Nitrogen

(C) Oxygen

0

Sulphur

D

19.

Structures that may be observed in animal

cells during mitosis but are NOT seen during

ceil division in flowering

plants

are

tem lfi.refers to the diagram below showing

a segment of a strand ofI)i :A.

(A) centrioles,

(B) chromatids

(C)

centromeres

(D)

spindle

fibres

ze.

In a rat cell, there are 32 chromatids present

at the beginning of Prophase of mitosis.

bonds

How many chromatids would there be in the

cell at the beginning of meiosis?

16. The base Xis

16

23

32

64

(A)

(B)

(C)

0

(A)

cytosine

(B) guanine

(C) uracil

(D) adenine

5


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Item 21 refers to the information below.

Mendel crossed pure-breeding round and

yellow peas with pure-breeding wrinkled

and

gaocn peas. The F seeds were roundand

yenow. The F Iseeds were self-pollinated and

the seeds of the

F.

showed the following

characteristics: -

355 round and

yellow

123 wrinkled and

yellow

26 round and green

34 wrinkled and

green

25.

21.

A major conclusion

that

can

be

made

from

this data

is that the

(A) alleles for round

and

yellow peas arc

dominant

(B) alleles

for wrinkled and green

peas

are dominant

(C) genes

fur pea colour

and

shape are

epistatic

(0)

genes for pea

colour and

shape are

li I : l k O O .

22. 'The mRNA molecule transcribed from the

DNA does NOT contain

(A) adenine

(B) cytosine

C guanine

D

thymine

23.

Which of the following statements correctly

describes the difference between RNAand

DNA?

26.

(A)

(B)

(C)

0

RNA is double strand, while DNA is

single strand.

RNA

has

uracil

as

one of'its organic

bases, wbile DNA does not.

DNA

has

five different nitrogenous

bases, while RNA has four.

RNA is found only in the cytoplasm,

while DNA is found only in the

nucleus.

Two parents, both of blood group B, have a

son with blood group

O.

The probability

that their next child will have blood group B

is

(A) 0.25

(B) 0.375

(e) 0.50

(D) 0.75

Which of the follovving

Inay

be used as

methods of gene transfer?

1.

Vrr .lS

Plasmid

Electroporation

DNA gun

I I .

III.

rv,

(A)

(B)

(C)

(0)

I and II only

I. II and ill only

I. ITand IV oniy

I, II, III and IV

Item 26

refers to the diagram below which

illustrates

a

form

of

gene

mutation.

A B

C;

n

:E F

G

C

D

A

B

n

F

G

A

B

E

F G

e

e o

.

.

e o

Which form of gene mutation does the

diagram illustrate?

(A)

(B)

(C)

(D)

Deletion-

Inversion

Insertion

DupJication


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27.

After which of the following forms of gene

mutation will

a

change

in

codons occur?

31

Which of the following provides nourish-

ment for the sperm-producing cells in the

testes?

1.

IT .

Ill.

N.

Substitution

(A)

(B)

(C)

(D)

Addition

Deletion

(A)

(B)

(C)

(D)

II and ITIonly

II and IV only

I, ITand ill only

I, III and IV only

32

Which of the following isNOT a part ofthe

anther?

Seminiferous tubule

S e r t o i i c e i l

Interst:.i tia1

ceil

Connective tissue

Inhibits the activity of the Leydig

cells

28.

(A) Pollengrain

(B) Stomium

(C)

Funicle

(D)

Tapetum

Giraffes are thought to have evolved long

necks due to a short supply ~f food ..

Selectionpressure favoured those with long

necks who were able to reach enough food

to survive. This type of selection is known

as

33.

What is the function of testosterone in

spermatogenesis?

(A)

(B)

(C)

{o>

,-,

stabilising .

disruptive

directional

artificial

(A)

29.

~4;.POSSIble benefit

of producing trar...genic

plantsis

(D)

(A) determination

of human genome

(C)

increased use of pesticides

(D) production ofelones

30. Which of the following plays the MOST

significant role in aUopatric speciation?

(A) Bebavioural isolation

(B) Temporalspeciation

(C) Ecological isolation

(D)

Geographical isolation

Inh ib its the

activity ofthe Sertoli

cells

Results

ill

the growth and

development of spermatogonia to

form

sperm

Results in the increased production

offollicle stimulating hormone


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Item 34 refers to the diagram below which shows the development of the embryo sac and female

gamete in a dicotyledenous plant.

e P r y n _

---- >>- ~ 1 degenerate

sac ~

J

mothereell

r >; ~

~ . : . J ----7 ~

embryo ,3

~ A

~s.e~

~~~-


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ltem37 refers to the diagram below which shows a longitudinal section of the ovule of a flower.

37.

The role of X is to

(A)

(B)

(C)

(D)

fuse with a male nucleus to form the embryo

fuse with

a

male nucleus to

form

the cotyledon

fuse with a male nucleus to fonn theendosperm

support

the

position of the ovum

and

disintegrate

after

fertilization

Item 38 refers to the diagram below which shows ovarian follicles in various stages of development.

38. Which option describes the correct order ofdeveIopment?

(A) I - II - ill - IV

(B) II - HI - I - IV

(C) ill - I - II - IV

(D) III - I - IV - II

9

I I


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~ refers to the simplified diagram below

of a recently implanted blastocyst in the

endometrium

of

the uterus.

Which.

of th e fo llow ing is th e

outermost

extra-

embryonic membrane and contributes to the

form ation of the placent a ?

45.

(A)

(B)

(C)

Dr

44. The structure labelled X is MOST likely tbe

(A) yolksac

(B)

trophoblas t

(C) blastocoel

(D) embryonic disc

Yolk sa c

Cape Biology Unit 1 Mutiple Choice 2009

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Transcript of Cape Biology Unit 1 Mutiple Choice 2009