Biology MCQs for Class 12 on “Biotechnology Applications – Transgenic Animals – 3”.
1. Transgenic mice are being developed for use in testing the safety of vaccines before they are used on ________
a) cattle
b) humans
c) pigs
d) monkeys
Answer: b
Clarification: Transgenic mice are being developed for use in testing the safety of vaccines before they are used on humans. They have been successfully used to test the safety of the polio vaccine.
2. Vaccines are normally tested on ______ before using on humans.
a) pigs
b) cattle
c) monkeys
d) mice
Answer: c
Clarification: Non-primate humans are extensively used for testing vaccine safety. Monkeys are usually used because they show similar reactions to any antigen as that of humans.
3. Chemical safety testing is also known as _______ testing.
a) therapeutic
b) physical
c) toxicity
d) transgenic
Answer: c
Clarification: Chemical safety testing is also known as toxicity testing. It is said so because it measures the amount of toxic (chemical) substance in a sample that may affect living or non-living environment. It is also called as toxicology testing.
4. Chemical safety testing is also known as _______ testing.
a) transgenic
b) therapeutic
c) physical
d) safety
Answer: d
Clarification: Chemical safety testing is also known as safety testing. It is a process used to test the safety of any sample such as food from a chemical (toxin) which may affect living or non-living environment.
5. The procedure of chemical safety testing is the same as that used for testing _______ of drugs.
a) anatomy
b) toxicity
c) basicity
d) acidity
Answer: b
Clarification: The procedure of chemical safety testing is the same as that used for testing the toxicity of drugs. Since toxic substances contain various chemicals, the testing procedure for both i.e. toxins and chemical safety is the same.
6. The genes carried by transgenic animals make them more ______ to toxic substances as compared to non-transgenic animals.
a) strong
b) sensitive
c) infective
d) resistant
Answer: b
Clarification: The genes carried by transgenic animals make them more sensitive to toxic substances as compared to non-transgenic animals. This happens because the newly inserted gene may or may not act against that particular toxin making them more susceptible to it.
7. To study the effects of the incorporated gene(s), the ________ animals are subjected to toxic substances.
a) infectious
b) normal
c) transgenic
d) non-transgenic
Answer: c
Clarification: To study the effects of the incorporated gene(s), the transgenic animals are subjected to toxic substances. These animals are developed by incorporating a foreign gene within them which is used to study the function of that particular gene. This gene may or may not act against the toxin.
8. Toxicity testing in transgenic animals will allow us to obtain results in ______ time.
a) less
b) appropriate
c) extra
d) more
Answer: a
Clarification: Toxicity testing in transgenic animals will allow us to obtain results in less time. This happens because transgenic animals are sensitive towards ant toxin or show immediate reactions. Thus these animals can also be used for testing the safety of vaccines.
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