Cape Biology Unit 1 Mutiple Choice 2009

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C.A.PE 960-8701, 968-8427

CAPE Biology Unit 1 Paper 1 June 2009 L

Sucrose makes a good transport molecule as seen in phloem tissue, because it is a (A)

disaccharide madeupoftwogiucose molecules

(B)

disaccharide made up of glucose and

3.

to

(A) (B) (C) CD)

»

galactose molecule

(C)

very reactive

(0)

and therefore combines easily with water very soluble molecule and can therefore be moved efficiently in high concentrations

chemically

~ refers to the structures below which show two isomers of glucose.

n

I

tl

CHpH ! J-.-----. n

'//1.

V'

!'\.

H

nu

AU

-\. ';'U \j

.•• 1

q

I"'--T~I

OH'r

H

•.. '1

I

H

OH

Which of'the following statements is NOT true about both isomers? (A) (B) (C) (D)

An important property of cellulose is its ability

Both have side groups attached to the first carbon in identical positions. Both are hexose sugars with the same chemical formula. Both form polysaccharides but which differ in their properties. Both arc soluble in water and can exist in an open chain form.

.•.. A

readily go into solution act as a fuel store in plants . readily combine with 0: glucose form structural components in plants

The arrangement of the polypeptide strands in collagen is BEST described as (A) (B) (C) tTI)

a triple helix an u-helix a double helix a J3-heiix

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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 . I Riuret

I

Test

Result

I Purple

test

colour was obtained.

I Blue colour

Benedict's test

I

Diiutc hydrochloric acid was added and the mixture was boiled, allowed to cool, neutralized and Bcnedict's tcst was carried out.

remained on neating.

Blue colour became brick-red on heating.

----------------------~---------------------------"

Whl h nflh(' foll,)witl15 indicates the food substance(s)

\ A)

I Ilt,1. 1"(11

(II) ()

N,1Il I

(I I

lu

present in the students' solution?

'11I

sugar only II tlll'lIl IOd non-reducing sugars N,H,I du 'inll sugar and protein 'II)

diagrammatical

representation

of a phospholipid

molecule.

What do X, Y and Z

l-x--','---

Z

, ! !

,--------i

I

LJy

,

(A~ ( ")

(0)

7.

I GlYCer!._.J~h;-O_SP,-h~. ~-=t_e __ ._._r-I ::.F_atty a~d i'Fa~id

Fatty acid I-Phosphate ______

i Glycerol ; Phosphate I Glycerol__. -L

In the chloroplast, light energy is trapped in the (A) (B) (C) (D)

stroma thylakoids envelope starch grain

j Phosphate I Glycerol iI Fatty- acid=----l

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8.

Which organelle is involved in cytokinesis plant cells? (A) (B)

(e) (D)

in

Item 11 refers to the diagram below.

X External

Golgi apparatus Endoplasmic reticulum Centriole Chloroplast

Item 9 refers to the diagram below which shows a transverse section of a plant

Internal surface

11.

The structure labelled X is

structure. (A) (B) (C) (D)

channel protein cholesterol extrinsic protein glycoprotein

-

Item 12 refers to the following

diagram.

Poiaramino acid

o 9.

I

.

The area labelled X represents

~! (A)

G~) (C) (D)

10.

Materials are moved in and out of cells by various mechanisms. Which of the following mechanisms are affected by respiration? I. II. IIl.

rv,

(A) (B) (C) (0)

A -

a cell a tissue an organ a system

Facilitated diffusion

Osmosis Active transport

Exocytosis 1and III only III and IV only I,lliandIVonly II, III and IV only

~

12.

i ......-. r> \ \ '-'

Polar amino acid Which of the following bonds is T{1'Tesented by the broken lines (-) in the diagram above? (A) (B) (C) (D)

Ionic Double Peptide Hydrogen

(a. C.A.PE

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Item 13 refers to the graph below showing the effect of pH on the activity of enzymes. .....

IT

T &

Rate of

reaction

T>"T &.LL

I I

V

rf\\'. \

1 2

3

4

5

6

7

8

'\1i

catalysed reaction.

T'C1 •• y

Reaction rate

\ \

!

0

Item 14 refers to the diagram below shows the effect of increasing su concentration on the rate of an e

. 10.

I

\

9

I

pH

I

13.

Chymotrypsin is an enzyme that is found in the human alimentary canal. It is active over a na.."TOWrange of alkaline pH values. Which

~

of the activity curves represent the activity of chymotrypsin? (A)

I and II only

(B)

IandNonly II and lIT ony illandNonly

(C) (0)

14.

Substrate concentration

Which of the labelled curves BES represents the presence of a comp inhibitor?

(A) (B) (C) (D)

I II III IV

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Item 15 refers to the diagram below which shows the structure of a triglyceride. X ii

H

I

H-C-

H-

(C)

Peptide Gl)'t':OS.idic Hydrogen

(D)

Phosphodiester

(B)

o

II

X

i

I C'-

What type of bOD~S are used to link nucleotides togetherto form apolynucleotide? (A)

-c~

H.-CX

I

17.

-c~

...,.

18.

A

ll

X

-C~

I

Why is the copied portion of the DNA longer than that of the functional !l1.RNA molecule produced from it? (A)

II

(B) Which of the following is represented by the label X? (A)

(B) (C)

(0)

(C)

(D)

Carbon Nitrogen Oxygen Sulphur 19.

Item lfi.refers to the diagram below showing a segment of a strand ofI)i"':A.

Structures that may be observed in animal cells during mitosis but are NOT seen during ceil division in flowering plants are (A) (B)

(C)

(D)

ze. bonds

16.

The base Xis (A)

cytosine

(B)

guanine

(C) (D)

uracil adenine

The DNA portion contains many genes. The DNA portion contains a promoter region. .. Only exon portions are included in tbemRNA. Only intron portions are included in the rnRNA.

centrioles, chromatids centromeres spindle fibres

In a rat cell, there are 32 chromatids present at the beginning of Prophase of mitosis. How many chromatids would there be in the cell at the beginning of meiosis? (A) (B)

16 23

(C)

32

(0)

64

[_.

6

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Item 21 refers to the information

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below.

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

Mendel crossed pure-breeding round and yellow peas with pure-breeding wrinkled and gaocn peas. The F1 seeds were round and yenow. The F I seeds were self-pollinated and the seeds of the F. showed the following

characteristics:

is (A) (B) (e) (D)

-

0.25 0.375 0.50 0.75

355 round and yellow 123 wrinkled and yellow 25.

126 round and green

34 wrinkled and green

Which of the follovving methods

1. 21.

A major conclusion this data is that the (A) (B)

that can be made from

(0)

genes fur pea colour and shape are epistatic genes for pea colour and shape are

liI:lkOO.

22.

23.

'The mRNA molecule transcribed DNA does NOT contain (A) (B)

adenine cytosine

(C)

guanine

(D)

thymine

(C)

(0)

l

DNA gun

(A) (B) (C) (0)

I and II only I. II and ill only I. IT and IV oniy I, II, III and IV

from the

DNA?

(B)

rv,

Item 26 refers to the diagram below illustrates a form of gene mutation.

Which of the following statements correctly describes the difference between RNAand

(A)

Electroporation

III.

are dominant (C)

Vrr".lS Plasmid

II.

alleles for round and yellow peas arc dominant alleles for wrinkled and green peas

Inay be used as

of gene transfer?

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.

A

••

C;

B

·n

n C

A

B

• •

26.

A e

B eo

Which

form

:E

'"

D

.

E

F

E

F

which

G *

G

• • • F . Geo

of gene mutation

does

the

diagram illustrate? (A) (B) (C) (D)

DeletionInversion Insertion DupJication

~~ __

(elB

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27.

Which of the following provides nourishment for the sperm-producing cells in the testes?

1. IT. Ill. N.

(A)

Seminiferous tubule

(B) (C) (D)

Sertoiiceil

(A) (B) (C) (D)

28.

Substitution Addition

Deletion II and ITIonly II and IV only I, ITand ill only I, III and IV only

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 stabilising

(A) (B) (C)

disruptive directional

,-,

artificial

{o>!

29.

~4;.POSSIble

(C)

increased use of pesticides production ofelones

Which of the following plays the MOST significant role in aUopatric speciation?

(D)

(A) (B) (C) (D)

33.

Pollengrain Stomium Funicle Tapetum

What is the function of testosterone in spermatogenesis? (A)

(D)

determinationof human genome

(A) (B) (C)

Which of the following is NOT a part of'the anther? '

benefit of producing trar..•. sgenic

(A)

(D)

32.

Interst:.itia1 ceil Connective tissue

.

plantsis

30.

31.

mutation will a change in codons occur?

After which of the following forms of gene

Bebavioural isolation Temporalspeciation Ecological isolation Geographical isolation

Inhibits the activity of the Leydig cells Inhibits 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 gamete in a dicotyledenous plant.

e•••Pryn_- --'--,>>- ~ sac

~

1

degenerate

~

J

of the embryo

'-.:.J ----7

,

r">;

sac and female

~

~ embryo ,3

mothereell

~~~-