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TRIAL SEMESTER 1- PAPER 1

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
Carbohydrates are made of which elements
a)
carbon, calcium, hydrogen
b)
carbon, hydrogen, oxygen
c)
carbon, oxygen, calcium
d)
carbon, oxygen, nitrogen
2.

Which are true about DNA and RNA?

i Both of them contain ribulose sugar.

ii Their monomers are nucleosides.

iii Their nitrogenous bases are purines and pyrimidines.

iv Their sugar phosphate backbones are maintained by phosphodiester bonds.

a)

i and ii

b)

i and iv

c)

ii and iii

d)

iii and iv

3.

In which of the following organs can you find a simple cuboidal epithelium?

a)

Ovary

b)

Heart

c)

Trachea

d)

Skin

4.

What type of muscle(s) is involuntary?

a)

skeletal and smooth

b)

cardiac and skeletal

c)

smooth and cardiac

d)

skeletal

5.
Identify the part of the neuron
a)
axon
b)
axon terminal
c)
dendrite
d)
Node of Ranvier
6.
What type of cells give the edge of this celery flexible support?
a)
Parenchyma
b)
Sclerenchyma
c)
Collenchyma
7.
which of this function not belongs to parenchyma tissue?
a)
carries out photosynthesis 
b)
stores food materials such as starch
c)
absorption of water and mineral
d)
provides support to the plants
8.

At what temperature is water at its densest?

a)

0oC

b)

4oC

c)

32oC

d)

100oC

9.
Name the growth phase of the cell cycle.
a)
metaphase
b)
telophase
c)
interphase
d)
anaophase
10.

CANCER CELLS ARE DIFFERENT BECAUSE THE DON'T ENTER THE G-0 PHASE AND THEY ARE LIKELY TO DO WHICH OF THE FOLLOWING

a)

FAIL TO COMPLETE S PHASE

b)

MUTATE DURING G1 PHASE

c)

REPEAT THE CELL CYCLE CONTINUOUSLY

d)

DIE AFTER COMPLETING MITOSIS

11.
An individual's sex is determined by 
a)
1 of 23 chromosomes
b)
2 of 46 chromosomes
c)
4 of 92 chromosomes
12.
Why are men 16 times more likely to be color-blind than women?
a)
to be color-blind, you must have a Y chromosome
b)
to be color-blind, all of your X chromosomes must have the gene
c)
color-blindness is caused by testosterone
d)
color-blindness is caused by the same gene as baldness
13.
What pattern of inheritance is shown in this image?
a)
Codominance
b)
Incomplete dominance
c)
Polygenic traits
14.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?

a)

male with white eyes

b)

female with red eyes

c)

male with red eyes

d)

female with white eyes

15.

In a population of cows at genetic equilibrium, 1500 cows have dominant grey coat, while the remaining 500 cows have recessive white coat. If all the white coat cows were sold and the remaining cows were left to breed randomly, what is the number of white coat cows in the next generation of 1000 cows?

a)

109

b)

250

c)

442

d)

500

16.

Use the following information to answer the questions below.

Albinism is a hereditary disease due to the absence of the skin pigment melanin. The allele for albinism is recessive to the allele for normal pigmentation. One person in 10,000 is an albino.

What is the percentage of homozygous dominant in this population?

a)

10 %

b)

56 %

c)

74 %

d)

98 %

17.

If a population experiences no migration, is very large, has no mutations, has random mating, and there is no selection, which of the following would you predict?

a)

The population will evolve, but much more slowly than normal.

b)

The makeup of the population's gene pool will remain virtually the same as long as these conditions hold.

c)

The composition of the population's gene pool will change slowly in a predictable manner.

d)

Dominant alleles in the population's gene pool will slowly increase in frequency while recessive alleles will decrease.

18.
The following karyotype illustrates an example of which syndrome?
a)
Turner's Syndrome
b)
Klienfelter's Syndrome
c)
Edward's Syndrome
d)
Down Syndrome
19.
What type of karyotype is shown here?
a)
Male with Turner Syndrome
b)
Male with Klinefelter Syndrome
c)
Female with Down Syndrome
d)
Female with Klinefelter Syndrome
20.
Identify the mutation in the picture.
a)
Deletion
b)
Inversion
c)
Duplication
d)
Translocation
21.

Mutations can benefit humans because they can:

a)

Cause illness

b)

Make an organism more suited to live in its environment.

c)

Make organisms live shorter lives

d)

Cause organisms to grow extra limbs.

22.
A segment of DNA produces methionine, threonine, histidine, aspartate, and glycine when translated. A substitution mutation occurs and causes the sythesis of the segment shown. Which is the new peptide chain when the new DNA segment is translated?
a)
methionine, leucine, histidine, aspartate, glycine
b)
methionine, phenylalanine, histidine, aspartate, glycine
c)
Methionine, proline, histidine, aspartate, glycine
d)
methionine, serine, histidine, aspartate, glycine
23.

The chromosomal mutation shown in the image is a

a)

deletion

b)

duplication

c)

inversion

d)

translocation

24.
Which is true about plasmids?
a)
Plasmids can be cut at specific sequences called restriction sites.
b)
Plasmids contain a promoter sequence that defines where transcription begins.
c)
Plasmids can contain an antibiotic resistance gene.
d)
All of the statements are true about plasmids.
25.

At what temperature does the Extension step of PCR occur?

a)

95°C

b)

50-65°C

c)

72°C

26.

The following are the steps taken during the cloning process.

1. Transformation 2. Insertion 3. Isolation 4. Screening 5. Cut

a)

3, 2, 5, 1, 4

b)

3, 2, 5, 4, 1

c)

3, 5, 2, 1, 4

d)

3, 5, 2, 4, 1

27.

The restriction site recognised by SmaI is

a)

GGATCC

b)

GGGCCC

c)

CCCGGG

d)

GAATTC

28.
What are the typical characteristics of a cloning vector?
a)
Bacterial cells cannot survive without it when grown under certain conditions.
b)
It contains restriction sites that allow the insertion of foreign DNA segments.
c)
It can replicate in bacterial cells.
d)
All of the above.
29.

Follicle stimulating hormones function is to

a)

mature eggs in the uterus

b)

mature eggs in the womb

c)

mature eggs in the cervix

d)

mature eggs in the ovaries

30.
In correct chronological order, the three phases of the human ovarian cycle are:
a)
menstrual → ovulation → luteal. 
b)
follicular → luteal → secretory. 
c)
menstrual → proliferative → secretory. 
d)
follicular → ovulation → luteal. 
31.
This occurs on days 1 to 5 of the menstrual cycle.
a)
The lining of the uterus remains in place in preparation for the possible arrival of an early embryo.
b)
Shedding of the lining of the uterus
c)
An egg is released from the ovaries
d)
The lining of the uterus builds up
32.

Which of the following statements about hormone regulation of the female reproductive cycle is false?

a)

LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries

b)

Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken

c)

Both progesterone and estradiol are produced by the follicles

d)

Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol

33.

The graph shows the concentration in the blood of three of the four hormones FSH, LH, oestrogen and progesterone.


Which hormone is not shown?

a)

FSH

b)

LH

c)

Oestrogen

d)

Progesterone

34.

Females make primary oocytes everyday

a)

False, they make them every month

b)

False, they make them every year

c)

False, they are born with all the primary oocytes they'll ever have

d)

True

35.

What name is given to the cells that attach to Sertoli cells?

a)

Secondary spermatocytes

b)

Spermatogonia

c)

Primary spermatocytes

d)

Spermatids

36.

How many secondary spermatocytes are produced after the first round of meiosis?

a)

1

b)

2

c)

4

37.

Choose the correct sequence to show the development of the foetus.

a)

Zygote > Feotus > Embryo > Baby

b)

Zygote > Embryo > Foetus > Baby

c)

Embryo > Zygote > Foetus > Baby

d)

Embryo > Foetus > Zygote > Baby

38.

The majority of the embryo´s organs are formed

a)

during the first trimester

b)

during the second trimester

c)

during the third trimester

39.

Where in the body does fertilisation occur in humans?

a)

Epididymis

b)

Uterus

c)

Oviduct

d)

Vagina

40.

What will happen to the first sperm that comes into contact with the egg membrane?

a)

Their membranes will fuse and the sperm is pulled inside the egg

b)

Their sperm membrane will become glued to the outside of the egg and remain there

c)

Their sperm's DNA will be sucked inside the cell while the rest of the sperm will fall off of the egg's surface

d)

Varies

41.

Which hormone is the basis for pregnancy test?

a)

hCG

b)

estrogen

c)

LH

d)

FSh

42.

What is the cortical reaction, and why is it important?

a)

The cortical reaction is the fusion of the egg cortex with the egg plasma membrane, which allows the sperm to enter.

b)

The cortical reaction is the entry of Ca2+ ions into the egg, which initiates development.

c)

The cortical reaction is the exocytosis of the cortical granules during egg maturation, which contain the components of the zona pellucida

d)

The cortical reaction is the release of the cortical granules after sperm entry, which converts the vitelline membrane into the fertilization membrane which blocks polyspermy.

43.

formation of three germ layers during embryo known as

a)

gastrulation

b)

organogenesis

c)

cleavage

d)

fertilization

44.

Oxytoxin is hormone that stimulate uterus contraction produced by

a)

fetus

b)

placenta

c)

mother's posterior pituitary gland

d)

mother's anterior pituitary gland

45.

Which of the following statements TRUE about parturition.

a)

high level progesterone induced oxytoxin release from mother

b)

placenta secrete prostaglandin that stimulate powerful uterus contraction

c)

Emotional stress of mother stimulate more uterus contaction.

d)

oxytoxin relase from fetus

46.

oxytocin receptor formed during end of pregnancy induced by

a)

low level progesterone

b)

high level progesterone

c)

low level estrogen

d)

high level estrogen

47.

Figure below shows a type of growth pattern.


Which growth pattern does it represent?

a)

Isometric

b)

Intermittent

c)

Allometric

d)

Limited

48.

Rearrange the FOUR phases of a typical sigmoid curve into the CORRECT sequence

I Log phase

II Stationary phase

III Linear phase

IV Lag phase

a)

I, IV, III, II

b)

I, IV, II, III

c)

IV, I, III, II

d)

IV, I, II,III

49.

The pattern of growth shown by Shorea sp., a woody plant found in the tropical rainforests is ..........

a)

Limited growth

b)

Unlimited growth

c)

Allometric growth

d)

Isometric growth

50.

Which of the following is/are TRUE about intermittent growth?


I It is also known as discontinuous growth

II Length is not an ideal parameter to measure intermittent growth

III It is a step-like pattern growth curve

a)

I only

b)

I and II only

c)

II and III only

d)

I, II and III

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