Cape Biology Unit 1 Mutiple Choice 2007

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

CAPE Biology Unit 1 Paper 1 June 2007 1.

One of the roles ofwatei' in:J~~sUis

4.

is~~~ffl~.~~ium

in blood.

Which of the £ollo"';ng properties .acc:ountsfor this role?

of water

The diligranl below shows the structure of a triglycrlde.

~

.no

!!

i

!!

H-C(A) (B)

2.

I

High specific heat capacity Strong cohesive forces between molecules High heat ofvaporisation Solvent for polar molecules and ions .

11- C

I

e-

The diagram below shows a ring structure of glucose.

-C

X

-C

x

0 H 0 II

-e

~ ~ ~

Which of the following represents the bond labelled X?

ClLOH

j ~ ,

-

X

.

(A)

-N-

I H

I

(B)

-ci OH

I

I OR

H

Which of the following indicates the fonn of glucose and in which molecule it is present? glucose CI.

(C)

-0-

(0)

-cil

0

,

f ~Vbe!"~ j p.-esent j Cellulose iStarch Ceiiulose starch

s.

i I

This figure below is part 01" a growing polysacchlL-ide .ohain.

~

X

The name of the bond labelled X is

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

glycosidic peptide hydrogen diester

Which of the following correctly names the type of bond represented by the broken line (-) in the diagram above? (A)

(B) (C)

(0)

Ionic bond Hydrogen bond Hydrophobic bond OisuJphidebond

--

-

(-

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Food tests were carried out on four different solutions. Which of the follow.ing combinations shows the solutions that contained only starch and sucrose? Su!ii~aUa

Biuret

Acid HytL-u!ysis

then Benedict:'s Test (A) (B) (e) (0)

.•.

" " :II;.

x

x

" x

Iodine in Pota5shun Iodine

&-1

x

..,

x

..•.

x

.,

'"

I

I

,

= negative result ."=positive result

lit

7.

The followingis an electronznicrograpb of"a section of' an animal cetl.

IV

III

(from Advanced Biology - Roberts.

Which of the structures labelled I, n. synthesis? (A) (B)

I

n

(C)

III

(D)

IV

nI and IV is concerned

p.44)

with protein

(-.

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8.

Which of the following is NOT a function of

the Golgi apparatus? (A) (B) ..(C) (D)

9.

Which of the following. labelled I to rv. gives the correct site where xylem tissue is found in a diotyledonous stem?

Lipid synthesis Manufacture of'lysosomes Packaging of glycoproteins

w._-~--.-! AI~.lr----n:

Membrane formation

--=-+---ffi L%--+---IV

(A) (8) (C) (D)

I Il III IV

Item 10 refers to the following figure which shows four types of tis-sue in cross section.

o

N

M

10.

Which of the following combinations correctly identifies the phloem and xylem tissues?

A

I)

p

(.~

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n.

Which of the following cells is represented, by the diagram below?

13.

Four identical samples of plant tissue are placed in four different solutions. Each sample of plant tissue has a water potential of 800 kPa. In which solution would full plasmolysis occur \\'ithin the tissue? Toe soiution of (A) (B) (C) (D)

14. (A) (B) (C) (D)

Neurone Plantcell Bacterium Sperm

Which of the following pairs of statements explains the mode of action of enzymes? 1. II.

12.

Which of the following identifies the structure represented by X in the diagram below? . -

- 300kPa - 500kPa - 800kPa -llOOkPa

Ill. N.

They are globular proteins and as a result are soluble. They bond to the substrate molecules at their active sites. They break down substrate molecules into products. They lower the activation energy tor

thereaction. (A) (B) (C) (D)

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

Channel protein Cholesterol Glycoprotein Extrinsic protein

I and II only II and ill only and IV only illand IV only

n

l_.

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l1an...l5 refers to the diagtam and an un~teaction.

below which

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represents

the activation

energy

for an enzyme-catalysed

Progress of reaction (time)

15.

The activation energy for an enzyme-catalysed reaction is represented by the region labelled (A) (B) (C) (0)

16.

formed

In IV

The graph below shows the time course of the activity of the enzyme sucrase at various temperatures.

t 'Quaalily oIprodud

I

n

(t:c ~ ~ sr c

v:«: •

0=

Time! miD

At which of the following temperatures enzyme work at the FASTEST rate? (A)

(B)

10 OC 2S "C

(C)

37 "C

(0)

600C

60

does the

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~ refers to the diagram below which shows atypical portion of the DNA molecule of the chromosome. i

19.

'The amino-acid sequence leucine-ly$ine-valiJle occurs in a portion of a polypeptide molecule. The table below shows the DNA codes for these amino-acids.

Widthlmm

I Vallne

I CA.J\

IOAA

Transfer RNA molecules with anticodons - needed for the synthesis of this polypeptide lUe

(A) (B)

GAA

TIT

CAA

GAA

(C)

CUU CUU

UUU AAA UUU

CAA GUU GUU

(0) 20.

One structure that may be observed in animal cells during mitosis but is NOT se~n in plant cells is (A) (B) (C) (D)

17.

"'••1vllich of the following i~ 1'.JOTrepresented try the region labelled X? (A) (B) (C) {Dj

18.

Hydrogen bonds between base pairs Two anti-parallel strands Pyrimidine to pyrimidine base pairing

Which of the following events occurs in transcription as well as in replication of ONA ? (A) (B) (C)

(0)

Free nucleotides bond to the DNA strand. Two new DNA molecules are produced. Uracil nucleotides bond to adenine on the DNA strand. Only part of the DNA molecule containing a gene unwinds.

21.

spindle fibres centromeres centrioles chromatids

Which of the following statements correctly describes homologous chro-oosomes? L II.

HI. IV. (A) (B) (C)

(D)

They are the same length. They are held together centromere. They m.v€"dle same gene loci. They bave identical alleles.

r, n and m only iandiUoniy I, ill and IV only rn and IV only

by

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Item 24 refers to the diagram below which shows the longitudinal section of part of a

Which of the following combinations correctly represents the chronological order of the events occuring in meiosis? J

a.

II.

III.

Chromatid pairs line up at rightangles to the equatorial plane. Homologous chromosomes are pulled apart by spindle fibres. Chiasmata form between chromosomes

IV.

v.

flower.

of'the'bivalents,

I-I---i

Individual chromatids migrate to poles, Chromosomes shorten and thicken and appear as pairs of chromatids.

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

I, III, IV, n, V III, V, II. I V, I. II, m, IV V, HI, I, n, IV

rv,

Item 23 refers to the diagram below which shows a pollen grain,just prlorto germination.

24.

23. (A)

a diploid tube nucleus and a haploid

(B)

a diploid tube nucleus and a diploid

(C)

generative nucleus which divides into two gametes a haploid tube nucleus and a haploid generative nucleus a haploid tube nucleus and a diploid

generative

(D)

nucleus

generative nucleus which divides into two gametes

The micropyle by (A) (B) (C) (D)

and funicle are represented

I and V II and V ill and IV IV and V

-

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15.

The following diagram shows the formation of gametes in a carpel of a flowering plant.

27.

Flower [2n]

I

•

(A) (8)

a diameter of approximately

(C) (0)

ahaploidnucleus af"oodstore

!

Embryo sac mother cells

I""Il

28.

~

The foliowing

list represents the p•. ":e5S of fecti.l.ization: I. IT.

~ Embl:1lO sac

~

Female gamete

I

IV

I

Spe;:mcontactsjelly coatof egg. Impenetrable surface.

(... ~) {B} (C) (D)

Which of the following correctly identifies the number of sets of chromosomes present at each numbered stage?

~

26.

(A) (B)

{C}

n

(0)

2n

n 2n 2n

2n n

!II n 2n

2n n

rv

(B)

(C) (D)

layer forms at egg

indicates the correct

t, n,

rv, ill III, I, II, IV IV, IT,I, III rv; m, II, I refers

to the simplified

dia~~m

below which sbows an embryo and ~~u:n...l';""·gm=nbrenes.

2!!

2n n 2n

!---....p,ar.;.'

u--....u'l

Which of the following identifies the structure which provides nourishment for the spennproducing cells in the testes? (A)

enzymes.

IV.

Which of the following order oftbese stages?

Fused polar nuclei

o

Acrosome releases Sperm enters cell.

some stages in

ill.

"