Genetic engineering_activity book ch.24_answer.ppt

butterbeanscubaBiotechnology

Dec 12, 2012 (4 years and 11 months ago)

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Activity Book 3


genetic engineering
(ch. 24


p.129),

Suggested answer


24.1

Issues related to genetically modified food and
genetic engineering

Task


Summarize the arguments and write down
your views on the issue below.

Issue debated:

(answer varies with Ss.)

Arguments from teams:

My personal views:

Genes coding for the drugs are
added to their genetic materials.

24.2


p.130

Application of genetic engineering in the
pharmaceutical industry

Task 1

1

Why can the sheep and the corn
mentioned in the article produce
drugs

that are products of other organisms?



Animals and plants can produce more

complex proteins.



Animals and plants do
not

produce

bacterial toxins.



Large quantities of product can be obtained.



The production cost is relatively low.

2


What are the
advantages

of using
animals and plants to produce drugs as
compared to the use of bacteria?

Application of genetic engineering in the
pharmaceutical industry

Accidental release

of the GMOs into the
natural environment may cause “ genetic

pollution ” or
upset the balance of the
ecosystem
. The altering of genes of the
animals

may cause
health problems

to
them.

3


Do you think the use of GMOs as
pharmaceutical factories will pose any
problems?

Application of genetic engineering in the
pharmaceutical industry

Raise the animals or grow the plants in
confined areas to prevent the release of

GMOs into the natural environment.

Enforce legislation to prevent the GMOs
for making drugs from being sold as food.

4


Can you suggest some safety measures
that should be taken when GMOs are
used to produce drugs?

Next

Application of genetic engineering in the
pharmaceutical industry

(Answer varies with Ss.)

5


What are your
views

on the use of
GMOs to produce drugs?

Next

Application of genetic engineering in the
pharmaceutical industry

(Answer various with Ss.)

Task 2


Write an
essay

of about 300 words, including
examples, benefits, issues and controversies in
the box below.

Next

Exercise 24
-

p.132

Multiple
-
choice questions

1.

A


2. C


3. A

4. C


5. D


6. D

7. B


8. C


9. A

10. C

Structured questions

1a

Describe the steps used by the biologists
to introduce the ‘non
-
fruiting’ gene into
plant Y.


Use special enzymes to isolate a
‘non
-
fruiting’ gene

(1m) and then insert it into
a vector (1m). Introduce the
vector
into a
host cell

(1m) which is then cultured with
plant Y’s cell (1m) to

produce the ‘non
-
fruiting’ plant Y (1m).

Exercise 24


p.133

1b

The genetically modified plant Y no longer
produced fruits and hence seeds. How
could the farmers reproduce plant Y in the
long run?


By
artificial vegetative
propagation

e.g. cutting, grafting
.
(1m)

1c
What do you expect about the change in
the population of pest X after plant Y has
been genetically modified? Explain your
answer.


The population of pest X will
drop

(1m) because the food
source for pest X is

decreased
(1m).

1d

Suggest
two
advantages and
two
disadvantages of this kind of human
manipulation of genes.


Advantages
: Increasing crop yields /
Better pest management / Reducing
the use of chemical pesticides


Disadvantages
: Disturbing the balance
of ecosystem / May cause some
unknown health

problems /
Threatening third world farmers


p.134

2a

Using the letters in the diagrams,
arrange the stages into correct order and
describe what happens at each stage in
the following table.

The insulin gene is inserted
into a vector

A

2

An insulin gene is removed
from human DNA.

D

1

What happens at this stage?

Stage

p.134

Correct order (2 or 0 m)

Correct corresponding description (1m each)

The bacterium / host cell
multiples / copies the insulin gene.

C

4

The vector is inserted into
another bacterium / a host cell.

B

3

What happens at this stage?

Stage


Since
excessive blood glucose

cannot be converted to
glycogen

for storage (1m), it will be
excreted in urine

(1m).


The patient will become
very tired

(1m) and

various complications
(
併發症
) 浡礠牥獵s琠⠱洩(

p.134

2b
What happens if the
diabetic
s

do not
have injection of human insulin?

2c

Explain how the diabetics benefit from
this technology.


Diabetics can obtain insulin
injections
at a much lower cost
.
(1m)

p.134


Yes
. It is because drugs can be produced
in
large scale

and in a
shorter time

(1m).


Genetic engineering also enables
scientists to develop
new drugs

to cure
some diseases (1m).
No
. It is because
the drugs produced may cause
unpredictable side
-
effects

(1m).
Super
-
organisms

may also be produced (1m)


2d


Do you agree with applying genetic
engineering in the pharmaceutical industry?
Give
two
reasons to support your answer.