1
Q:

A true species in mauritius failed to reproduce because of the extinction of a fruit eating bird. Which one of the following was that bird?

A) Dove B) Dodo
C) Condor D) Skua

Answer:   B) Dodo



Explanation:
Subject: Biology
Q:

What is the functional unit of a skeletal muscle called?

A) Myofibril B) Sarcomere
C) Fiber D) Fasciculus
 
Answer & Explanation Answer: B) Sarcomere

Explanation:

The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, which are the basic functional units of the skeletal muscle.

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0 2
Q:

Why are yeast cells frequently used as hosts for cloning?

A) they are eukaryotic cells B) they do not have plasmids
C) only yeast cells allow the gene to be cloned D) they easily form colonies
 
Answer & Explanation Answer: A) they are eukaryotic cells

Explanation:

If you were to produce a protein in bacterial cloning systems, you would not get the same post transcriptional and post translational modifications because the prokaryotic and eukaryotic systems work differently on the modifications.

Thus human recombinant protein genes are usually cloned in yeast cells. Also since they have a short generation time, they can be easily culture.

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Q:

Basophils increase in number when parasitic invasion occurs.

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

FALSE. Basophils number will not be increased when parasitic invasion occurs.


 


Basophils are a type of white blood cell. Although they're produced in the bone marrow, they're found in many tissues throughout your body. They're part of your immune system and play a role in its proper function.


 


Basophils appear in many specific kinds of inflammatory reactions, particularly those that cause allergic symptoms. If your basophil level is low, it may be due to a severe allergic reaction.


 


Basophils contain anticoagulant heparin, which prevents blood from clotting too quickly. They also contain the vasodilator histamine, which promotes blood flow to tissues.


 

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0 1
Q:

A pulse can be detected most easily in

A) a vein B) a lacteal
C) an artery D) a capillary
 
Answer & Explanation Answer: C) an artery

Explanation:

A pulse can be detected most easily in Arteries as they are under much greater pressure than veins because they are carrying blood away from the heart which is the pumping machine to force blood to move to all of the body.

 

Every time the hear contracts, it can be felt in an artery where a surge of blood has just been forced.

 

A capillary is too small to feel a pulse and a lacteal is part of the lymphatic system found in the small intestine.

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1 13
Q:

A Sarcomere is the distance between two

A) Z discs B) H zones
C) A bands D) I bands
 
Answer & Explanation Answer: A) Z discs

Explanation:

A sarcomere is the basic unit of striated muscle tissue. It is the repeating unit between two Z lines.

Skeletal muscles are composed of tubular muscle cells (myocytes called muscle fibers or myofibers) which are formed in a process known as myogenesis. Muscle fibers contain numerous tubular myofibrils. Myofibrils are composed of repeating sections of sarcomeres, which appear under the microscope as alternating dark and light bands. Sarcomeres are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.

 

A muscle fiber from a biceps muscle may contain 100,000 sarcomeres.

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1 18
Q:

Bacteria divide by

A) Binary Fusion B) Cytokinesis
C) Binary Fission D) Both B & C
 
Answer & Explanation Answer: C) Binary Fission

Explanation:

Most bacteria divide by binary fission, a form of cell division in which DNA replication and segregation occur simultaneously. This process involves active partitioning of the single bacterial chromosome and positioning of the site of septation.

 

Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells.

 

Binary fission begins when the DNA of the bacterium divides into two replicates. The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. Each daughter cell is a clone of the parent cell.

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0 17
Q:

Which of the following does not influence haemoglobin saturation?

A) Nitric oxide B) Carbon dioxide
C) Temperature D) DPG
 
Answer & Explanation Answer: A) Nitric oxide

Explanation:
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0 48
Q:

Which of the following is an example of polygenic inheritance?

A) Skin pigmentation in humans B) Huntingtonʹs disease in humans
C) White and purple flower color in peas D) The ABO blood groups in humans
 
Answer & Explanation Answer: A) Skin pigmentation in humans

Explanation:

Polygenic inheritance involves the determination of a particular phenotypic characteristic by many genes, called polygenes(group of genes influencing a quantitative characteristic), each having a small effect individually.

Height and skin colour in humans are examples of Polygenic characters.

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