31. Which of the following is the lens of the eye?
[A] Concave
[B] Convex
[C] Biconcave
[D] Biconvex
Show Answer
Correct Answer: D [Biconvex]
Notes:
The lens of the eye is a biconvex, relatively acellular, optically transparent intraocular structure. It serves to transmit light to the retina with the least amount of light scattering along with the cornea.
32. Myopia and hypermetropia can be corrected by __
[A] Concave and a plano-convex lens
[B] Concave and convex lens
[C] Convex and concave lens
[D] Plano-concave lens for both defects
Show Answer
Correct Answer: B [Concave and convex lens]
Notes:
Myopia and hypermetropia can be corrected by Concave and convex lens respectively.
33. What is the name of the only moving bone in the human skull?
[A] Ethmoid bone
[B] Mandible bone
[C] Nasal bone
[D] Lacrimal bone
Show Answer
Correct Answer: B [Mandible bone]
Notes:
The mandible is the largest bone in the human skull. It holds the lower teeth in place, aids in chewing, and lines the lower jaw. The mandible is the only movable bone in the human skull.
34. Which of the following is the most fatal non-infectious disease?
[A] AIDS
[B] Cancer
[C] Diabetes
[D] Obesity
Show Answer
Correct Answer: B [Cancer]
Notes:
Cancer is the most fatal non-infectious disease. In cancer, some cells in the body grow uncontrollably and spread to other parts of the body.
35. In incomplete dominance__.
[A] Phenotype of both alleles is expressed
[B] Phenotype of only one allele is expressed
[C] Phenotype of neither of the alleles are expressed
[D] Phenotype of both alleles is partially expressed
Show Answer
Correct Answer: D [Phenotype of both alleles is partially expressed]
Notes:
In incomplete dominance, the phenotype of both alleles is partially expressed.
36. A process where new combinations of alleles are formed is called?
[A] Genetic Drift
[B] Mutation
[C] Genetic Recombination
[D] Natural selection
Show Answer
Correct Answer: C [Genetic Recombination]
Notes:
A process where new combinations of alleles are formed is called Genetic Recombination.
37. Blue-Green algae are __
[A] Symbiotic Nitrogen-Fixing Cyanobacteria
[B] Free-Living Nitrogen-Fixing Bacteria
[C] Loose Association of Nitrogen-Fixing Bacteria
[D] Symbiotic Nitrogen-Fixing Bacteria
Show Answer
Correct Answer: A [Symbiotic Nitrogen-Fixing Cyanobacteria]
Notes:
Blue-Green algae are Symbiotic Nitrogen-Fixing Cyanobacteria. Liverworts, cycad roots, fern, and lichens are also some of the Nitrogen-fixing cyanobacteria.
38. Which of the following initiates replication in DNA?
[A] DNA ligase
[B] Origin of replication
[C] Termination sequences
[D] Histone proteins
Show Answer
Correct Answer: B [Origin of replication]
Notes:
A chromosome contains the specific DNA sequence, called the origin of replication, which is responsible for initiating replication. DNA ligase is an enzyme. It helps in binding the DNA. Termination sequence is the site where DNA replication ends while histones are the proteins around which DNA is wound.
39. What is an autonomously repeating circular extra-chromosomal DNA?
[A] Bacteria
[B] Nitrogenous base
[C] RNA
[D] Plasmid
Show Answer
Correct Answer: D [Plasmid]
Notes:
A plasmid is an autonomously repeating circular extra-chromosomal DNA. They naturally exist in bacterial cells, and they also occur in some eukaryotes.
40. Crossing-over occurs during ____:
[A] Diplotene
[B] Pachytene
[C] Leptotene
[D] Zygotene
Show Answer
Correct Answer: B [Pachytene]
Notes:
Chromosomal crossover (or crossing over) is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis (pachytene) during a process called synapsis.
