31. The membrane investing the ovum just outside the membrane granulosa is __.
[A] theca interna
[B] discus proligerus
[C] zona pellucida
[D] vitelline membrane
Show Answer
Correct Answer: A [theca interna]
Notes:
Theca Interna cells express receptors for luteinizing hormone (LH) to produce androstenedione.
32. Which disease is caused by Yersinia pestis?
[A] Pertussis
[B] Plague
[C] Leprosy
[D] Diptheria
Show Answer
Correct Answer: B [Plague]
Notes:
Plague disease is caused by Yersinia pestis bacterium which is spread mostly by fleas on rodents and other animals.
33. Which of the following section of DNA provides information for one protein?
[A] Nucleus
[B] Chromosomes
[C] Trait
[D] Gene
Show Answer
Correct Answer: D [Gene]
Notes:
The Gene of DNA provides information for one protein. This is the basic physical and functional unit of heredity.
34. Which of the following is an example of nonsense mutation?
[A] Sickle cell anaemia
[B] Cystic fibrosis
[C] Opitz-Kaveggia syndrome
[D] None of these
Show Answer
Correct Answer: B [Cystic fibrosis]
Notes:
Cystic fibrosis is an example of nonsense mutation. While Sickle cell anemia is an example of missense mutation.
35. Which of the following is an example of chromosomal disorders?
[A] Down’s syndrome
[B] Albinism
[C] Haemophilia
[D] Sickle cell anaemia
Show Answer
Correct Answer: A [Down’s syndrome]
Notes:
Down’s syndrome is an example of a chromosomal disorder. Whereas Albinism, Haemophilia, and Sickle cell anemia are examples of Mendelian Disorder.
36. Which of the following is an oncogenic trait?
[A] a type of trait whose phenotype is influenced by more than one gene
[B] a trait produced by the effect of a gene or an allele.
[C] a gene that has the potential to cause cancer.
[D] None of these
Show Answer
Correct Answer: C [a gene that has the potential to cause cancer.]
Notes:
A gene that has the potential to cause cancer is called an oncogenic trait.
37. Which of the following plants are used as green manure in crop fields and sandy soils?
[A] Dicanthium annulatum and Azolla pinnata
[B] Crotalaria junecea and Alhagi camelorum
[C] Calotropis procera and Pitylanthus niruri
[D] Saccharum munja and Lantana camara
Show Answer
Correct Answer: B [Crotalaria junecea and Alhagi camelorum]
Notes:
Crotalaria junecea and Alhagi camelorum plants are used as green manure in crop fields and sandy soils. The specific plant or crop varieties that are grown and turned into the soil, thereby improving its overall quality, is called green manure.
38. What is another important research area of biotechnology offers?
[A] optimum conditions for the catalyst
[B] pure form of catalyst
[C] an impure form of the catalyst
[D] purification of products
Show Answer
Correct Answer: A [optimum conditions for the catalyst]
Notes:
Optimum conditions for the catalyst is another important research area of biotechnology offers.
39. Which of the following is a mobile genetic element?
[A] virus
[B] bacteria
[C] Transposons
[D] insertion sequence
Show Answer
Correct Answer: C [Transposons ]
Notes:
A transposon is a mobile genetic element. This is also known as jumping genes. A type of genetic material that can move around within a genome is called a mobile genetic element.
40. BT seed is associated with ____:
[A] Rice
[B] Cotton
[C] Wheat
[D] Oil seeds
Show Answer
Correct Answer: B [Cotton]
Notes:
Cotton is the most popular of the BT crops. In BT cotton, BT gene was isolated and transferred from a bacterium Bacillus thurigiensis to American cotton. The American cotton was subsequently crossed with Indian cotton to introduce the gene into native varieties. The BT cotton variety contains a foreign gene obtained from Bacillus thuringiensis. This bacterial gene, introduced genetically into the cotton seeds, protects the plants from bollworm (A. lepidoptora), a major pest of cotton.
