11. Consider the following effects of genetic engineering:
- Disease resistance
- Growth promotion
- Closing
- Longevity
Of these effects, those that have be entried out with a certain amount of success include (UPSC Prelims 1990)
[A] 1, 3 and 4
[B] 2, 3 and 4
[C] 1, 2 and 4
[D] 1, 2 and 3
Show Answer
Correct Answer: D [1, 2 and 3]
Notes:
Genetic engineering can have effects on many things but till now the scientists have not found any way to increase longevity by genetic engineering.
12. Which of the following branch of biology deals with management of farms and the science of crop production?
[A] Agrostology
[B] Agaronomy
[C] Agroinformatics
[D] Agronomy
Show Answer
Correct Answer: D [Agronomy]
Notes:
Agronomy is the branch of biology that deals with the management of farms and the science of crop production.
13. Which of the following was discovered by Alexander Fleming?
[A] DNA
[B] Vaccination
[C] penicillin
[D] blood circulation
Show Answer
Correct Answer: C [penicillin]
Notes:
Alexander Fleming discovered penicillin, whose use as an antibiotic has saved millions of lives.
14. Which of the following person related to the invention of DDT?
[A] Paul Muller
[B] Roe Berth
[C] Frances Kelsey
[D] Jack Horner
Show Answer
Correct Answer: A [Paul Muller]
Notes:
DDT was first synthesized in 1874 by Austrian chemist Othmar Zidler. The insecticidal action of DDT was discovered in 1939 by the Swiss chemist Paul Hermann Müller.
15. Who introduced the three kingdoms of classification?
[A] RH Whittaker
[B] Ernest Haeckel
[C] Copeland
[D] Carolus Linnaeus
Show Answer
Correct Answer: B [Ernest Haeckel]
Notes:
Plantae, Protista and Animalia are the three kingdom of Classification introduced by Ernest Haeckel.
16. In which of the following organisms is the nuclear membrane absent?
[A] Nostoc
[B] Volvox
[C] Agaricus
[D] Penicillium
Show Answer
Correct Answer: A [Nostoc]
Notes:
Nostoc, also known as star jelly, troll’s butter, witch’s butter, and witch’s jelly, is a genus of cyanobacteria. Nostoc does not have a nuclear membrane. This is a characteristic of prokaryotic cells, which lack a nucleus. The genetic material in these cells is found in the cytoplasm, not enclosed within a nuclear membrane. On the contrary, Volvox, Agaricus, and Penicillium are all eukaryotic organisms, hence possess a nuclear membrane.
17. Which of the following is true for chromatin?
[A] These are highly condensed DNA
[B] It is found in the nucleus
[C] It contains a single dsDNA
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Chromatin is a complex of DNA and proteins that make up chromosomes within the nucleus of eukaryotic cells.
18. Which of the following protects the body from infectious disease?
[A] Leukocytes
[B] Red Blood Cells
[C] Endoplasmic Reticulum
[D] Golgi Bodies
Show Answer
Correct Answer: A [Leukocytes]
Notes:
White blood cells (WBC), also called leukocytes or leukocytes. Immune system cells that help protect our body from infectious diseases.
19. Which of the following virus has its envelope from the host cell nucleus?
[A] Paramyxoviruses
[B] Retroviruses
[C] Orthomyxoviruses
[D] Herpesviruses
Show Answer
Correct Answer: D [Herpesviruses]
Notes:
The Herpesviridae are a large family of DNA viruses. It causes infections and some diseases in animals, including humans. Herpes viruses are divided into three groups: α herpesviruses, herpes simplex virus types 1 and 2.
20. In cell culture, the measles virus can lead to which of the following?
[A] nuclear pyknosis
[B] transformation of cells
[C] syncytium formation
[D] rounding and aggregation of cells
Show Answer
Correct Answer: C [syncytium formation]
Notes:
In cell culture, the measles virus can lead to syncytium formation.
