31. What are the types of cells found in the retina?
[A] Purkinje cells
[B] Schwann cells
[C] Neuroglial cells
[D] Amacrine cells
Show Answer
Correct Answer: D [Amacrine cells]
Notes:
The amacrine cell is a type of cell found in the retina. Amacrine cells lie in the inner retina and make connections with bipolar cells and ganglion cells.
32. Bi-focal lenses are required to correct __
[A] astigmatism
[B] coma
[C] myopia
[D] presbyopia
Show Answer
Correct Answer: D [presbyopia]
Notes:
Bifocals are glasses that have both a correction for your distance vision on the top of the lens and a correction to help you read at the bottom.
33. Which of the following cells of the testis secrete testosterone?
[A] sertoli cells
[B] cells of germinal epithelium
[C] cells of Leydig or interstitial cells
[D] secondary spermatocytes
Show Answer
Correct Answer: C [cells of Leydig or interstitial cells]
Notes:
Leydig or interstitial cells of the testis secrete testosterone. It is present outside the seminiferous tubules in the interstitial spaces.
34. Which of the following microorganism causes a bacterial disease in a poultry farm?
[A] Ascaridia galli
[B] Mycobacterium avium
[C] Eimeria
[D] Paramyxovirus
Show Answer
Correct Answer: B [Mycobacterium avium]
Notes:
Mycobacterium avium microorganism causes a bacterial disease in a poultry farm.
35. Which of the following is known as the “Father of Genetics”?
[A] Morgan
[B] Mendel
[C] Watson
[D] Bateson
Show Answer
Correct Answer: B [Mendel]
Notes:
Mendel is known as the “Father of Genetics”.
36. What is the nitrogen-fixing symbiotic organism present in Azolla?
[A] nostoke
[B] anabaena
[C] aulosira
[D] azospirillum
Show Answer
Correct Answer: B [anabaena]
Notes:
Anabaena is the nitrogen-fixing symbiotic organism present in Azolla. Anabaena is a genus of filamentous cyanobacteria that exist as plankton.
37. Klenow fragment is derived from which of the following?
[A] DNA Ligase
[B] DNA Pol-I
[C] DNA Pol-II
[D] Reverse Transcriptase
Show Answer
Correct Answer: B [DNA Pol-I]
Notes:
Klenow fragment is derived from DNA Pol-I. A Klenow fragment is a large protein fragment. It is enzymatically cleaved by the protease subtilisin to DNA polymerase from E. coli.
38. Which of the following makes the skin layer impervious to water?
[A] Melanin
[B] Collagen
[C] Keratin
[D] Chitin
Show Answer
Correct Answer: C [Keratin]
Notes:
Keratin is a family of fibrous structural proteins involved in making up the outer layer of human skin. It is also the key structural component of hair and nails. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength. It also makes up fish scales and crustacean shells, bird feathers and beaks, animal horns and hooves.
39. A cross between homozygous recessive and heterozygous plant is
____:
[A] Back cross
[B] Test cross
[C] Monohybrid cross
[D] Dihybrid cross
Show Answer
Correct Answer: B [Test cross]
Notes:
A cross between a homozygous plant with recessive traits and a heterozygous plant is known as a test cross. A test cross is a valuable tool in predicting the genotype of the organism in question. In its simplest form, a test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype). Test cross is done to determine the genotype of an F2 generation plant, showing dominant characteristics. In the test cross, an F2 plant that shows the dominant trait is crossed with the homozygous recessive.
40. Water of coconut is ____:
[A] Liquid nucellus
[B] Liquid endocarp
[C] Degenerated liquid endosperm
[D] Liquid mesocarp
Show Answer
Correct Answer: C [Degenerated liquid endosperm]
Notes:
Coconut water, the clear liquid inside young green coconuts (fruits of the coconut palm), is liquid endosperm. In early development, it serves as a sus pension for the endosperm of the coconut during their nuclear phase of development. It contains sugars, vitamins, minerals, proteins, free amino acids and growth promoting factors.