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Q:

Sleeping sickness in man is caused by the organism

A) plasmodium B) entamoeba
C) giardia D) trypanosoma

Answer:   D) trypanosoma



Explanation:

Trypanosoma is a protozoan animal. It lives as a parasite in the blood and later invades the cerebrospinal fluid to cause the sleeping sickness. This parasite is transmitted by the Tsetse fly.

Subject: Biology
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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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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Q:

What are the three main parts of a Eukaryotic cell?

Answer

Eukaryotic cells are found in plants, animals and unicellular organisms.


 


The three main part of Eukaryotic cells are


1. Plasma membrane or membrane-bound organelles which carries out the cell functions.


2. Nucleus which contains the cell's DNA (and)


3. Cytoplasm which is a jelly like fluid interior of the cell.

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Q:

Oxygen in our blood is transported by a protein named

A) keratin B) myoglobi
C) collagen D) haemoglobin
 
Answer & Explanation Answer: D) haemoglobin

Explanation:

Oxygen in our blood is transported by a protein named Haemoglobin.

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3 33
Q:

Movement of cell against concentration gradient is called

A) active transport B) diffusion
C) osmosis D) passive transport
 
Answer & Explanation Answer: A) active transport

Explanation:

The only transport method that can move species against their concentration gradient i.e, from low to high concentration is called Active transport.

 

Facilitated diffusion only moves species down their concentration gradient i.e, from high to low concentration.

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Q:

Name the two main types of Fermentation?

Answer

Fermentation is the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat.


 


The two most common types of fermentation are


(1) alcoholic fermentation (and) 


(2) lactic acid fermentation.


 


(1) Alcoholic fermentation : the type of fermentation in which ethyl alcohol is the main end product .This is very common in yeast (unicellular fungus) and also seen in some bacteria. Yeast cells release enzymes called zymase complex which bring about the fermentation. The reactions are similar to anaerobic respiration.


 


(2) Lactic acid fermentation : The type of fermentation in which lactic acid is the end product.


It is carried out by some bacteria (e.g. lactic acid bacteria), and also by animals (muscle glycolysis in animals, under oxygen deficiency, results in the formation of lactic acid this is whay we experience in muscle cramps, or "Charley horse").

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1 35
Q:

Translation of the dna sequence AAGCTGGGA would result in

A) a DNA strand with the base sequence TTCGACCCT B) an mRNA strand with the sequence TTCGACCCT
C) a sequence of three amino acids linked by peptide bonds D) an mRNA strand with the sequence UUGCACCCU
 
Answer & Explanation Answer: A) a DNA strand with the base sequence TTCGACCCT

Explanation:

Translation of the dna sequence AAGCTGGGA would result in a DNA strand with the base sequence TTCGACCCT.

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0 38
Q:

What part of the body controls balance?

A) Cerebrum B) Cerebellum
C) Medulla oblangata D) Amygdala
 
Answer & Explanation Answer: B) Cerebellum

Explanation:

The cerebellum is a small part of the brain positioned at the back of the head, where it meets the spine, which acts as the body's movement and balance control centre.

 

Basic-brain-anatomy1524025969.jpg image

 

It's a lot smaller than the cerebrum at only 1/8 of its size. But it's a very important part of the brain.

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