31. The Leydig cells which are found in the human body are the secretory source of __
[A] Glucagon
[B] Intestinal mucus
[C] Androgens
[D] Progesterone
Show Answer
Correct Answer: C [Androgens]
Notes:
The Leydig cells which are found in the human body are the secretory source of Androgens.
32. What is Southern blotting?
[A] Attachment of probes to DNA fragments
[B] Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet
[C] Comparison of DNA fragments to two sources
[D] Transfer of DNA fragments to electrophoretic gel from cellulose membrane
Show Answer
Correct Answer: B [Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet]
Notes:
Southern blotting is the transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet.
33. What is ELISA?
[A] Using radiolabelled second antibody
[B] Usage of RBCs
[C] Using complement-mediated cell lysis
[D] Addition of substrate that is converted into a colored end product
Show Answer
Correct Answer: D [Addition of substrate that is converted into a colored end product]
Notes:
ELISA stands for enzyme-linked immunoassay. This is a commonly used laboratory test to detect antibodies in the blood. An antibody is a protein produced by the body’s immune system when it detects harmful substances, called antigens.
34. Some strains of Bacillus thuringiensis can kill certain insects such as __.
[A] Lepidoptera
[B] scorpion
[C] fruit fly
[D] dragonfly
Show Answer
Correct Answer: A [Lepidoptera]
Notes:
Some strains of Bacillus thuringiensis can kill certain insects such as Lepidoptera. They are an order of insects consisting of moths and butterflies.
35. _____ is the study of the microanatomy of cells, tissues and organs as seen through a microscope:
[A] Entomology
[B] Paleontology
[C] Histology
[D] Lchthyology
Show Answer
Correct Answer: C [Histology]
Notes:
Histology is the study of the micro anatomy of cells, tissues, and organs as seen through a microscope. It examines the correlation between structure and fun-ction.Histology is the micro-scopic counterpart to gross anatomy which looks at larger structures visible without a microscope.
36. The special modified epidermal cells surrounding stomatal pore are called ____:
[A] Accessory cells
[B] Epithelial cells
[C] Guard cells
[D] Subsidiary cells
Show Answer
Correct Answer: C [Guard cells]
Notes:
The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gaseous exchange and rate of transpiration.
37. Which part of brain maintains posture and balance of human body?
[A] Cerebrum
[B] Pons
[C] Cerebellum
[D] Medulla
Show Answer
Correct Answer: A [Cerebrum]
Notes:
• Cerebellum is located under the cerebrum. Function: Coordinate muscle movements, maintain posture, and balance of the body.
• Cerebrum is the largest part of the brain. Function: Controls all our voluntary functions, as well as our thinking, vision, hearing etc.
• Pons is the largest part of the brainstem. Function: Sensory functions including arousal, respiratory processes, fine motor control, equilibrium, muscle tone, and the Circadian cycle.
• Medulla is the lowest part of the brainstem. Function: Relay of nerve signals between the brain and spinal cord, Coordination of body movements and Mood regulation.
38. Which of the following blood group is a universal recipient?
[A] A
[B] B
[C] O
[D] AB
Show Answer
Correct Answer: D [AB]
Notes:
Blood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood plasma does not contain any antibodies against either A or B antigen. Therefore, an individual with type AB blood can receive blood from any group (with AB being preferable), but cannot donate blood to either A or B group. They are known as universal recipients.
39. For immediate energy production in cells, one should take ____:
[A] Glucose
[B] Proteins
[C] Sucrose
[D] Vitamin C
Show Answer
Correct Answer: A [Glucose]
Notes:
Glucose provides immediate energy for our brain and red blood cells. The most pressing need of all cells in the body is for an immediate source of energy. Some cells such as brain cells have severely limited storage capacities for either glucose or ATP, and for this reason, the blood must maintain a fairly constant supply of glucose.
40. Which of the following organ is responsible to remove nitrogenous waste from body?
[A] Liver
[B] Lungs
[C] Kidney
[D] Pancreas
Show Answer
Correct Answer: C [Kidney]
Notes:
The excretory system is responsible for removing nitrogen-containing wastes from the body. The main parts of the excretory system are the kidneys. The other functions of Kidney are:
• Regulate electrolyte (salt) concentrations,
• Regulate amount of fluid within the body,
• Help regulate blood pressure,
• Help maintain acid-base balance,
• Produce hormones that affect blood and bones.
