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Q:

The enzyme that is necessary to bring about clotting of blood is 

A) peptidase B) amylase
C) lipase D) thrombokinase

Answer:   D) thrombokinase



Explanation:

The clotting of blood is a chain reaction initiated by the enzyme thrombokinase produced by the platelets. This causes prothrombin to be converted into thrombin in the presence of Ca++ion.

Thrombin combines with fibrinogen  to produce fibrin threads which entangles the corpuscles to form the clot.

Subject: Biology
Exam Prep: AIEEE , GATE
Q:

Synapsis occurs during

A) Mitosis B) Meiosis
C) Both A & B D) None
 
Answer & Explanation Answer: B) Meiosis

Explanation:

Synapsis is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them.

Synapsis takes place during prophase I of meiosis.

It is also called as Syndesis.

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1 0
Q:

What carries Blood back to the Heart?

A) Veins B) Arteries
C) Both A & B D) None
 
Answer & Explanation Answer: A) Veins

Explanation:

Veins carries Blood back from the body parts to the Heart.

 

We know that The circulatory system of our body is a loop. The Heart is the pump, the arteries and their smaller branches (arterioles) carry oxygen rich blood all through your body and the veins and their smaller branches (venules) carry oxygen depleted blood and waste products back.

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1 1
Q:

You can See, Smell and Taste microorganisms.

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

Explanation:

You cannot see a microorganisms without using a Microscope. You also cannot taste or smell microorganisms such as bacteria in contaminated food.

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Q:

Which feature do Prokaryotic and Eukaryotic cells share

A) Nucleus B) DNA
C) Nuclear membrane D) Membrane bound Organelles
 
Answer & Explanation Answer: B) DNA

Explanation:

Prokaryotic and Eukaryotic cells do share a feature of DNA.

 

Both prokaryotic and eukaryotic cells have structures in common.

 

All cells have a plasma membrane, ribosomes, cytoplasm, and DNA.

 

Prokaryotic cells are primitive cells which have no true nucleus and membrane bound organelles, 

while

Eukaryotic cells are cells that have true nucleus, membrane bound organelles and well defined structures and layouts.

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Q:

What are the three parts of the Nucleotide?

Answer

Nucleotides are the building blocks of the DNA and RNA used as genetic material. Nucleotides also are used for cell signaling and to transport energy throughout cells.


Both deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are made up of nucleotides which consist of three parts::


1. Nitrogenous Base
2. Pentose Sugar
3. Phosphate Group.

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Q:

At what temperature do pathogenic bacteria grow best in food?

A) 5 to 15 degrees Celsius B) 15 to 25 degrees Celsius
C) 20 to 45 degrees Celsius D) 40 to 65 degrees Celsius
 
Answer & Explanation Answer: C) 20 to 45 degrees Celsius

Explanation:

The Bacteria that causes Food Borne illness are called Food Borne Pathogens. Most of the pathogens are mesophilic in nature, optimum temperature may be around 20-45 degree celsius. This range of temperatures is often called the "Danger Zone." Dry foods do not support the growth of bacteria.

In order to kill pathogenic bacteria you need temperatures above 74ºC. Temperature is the easiest factor to control in order to prevent bacterial growth.

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5 130
Q:

Poison glands of snakes are homologous to

A) sebaceous glands of mammals B) salivary glands of vertebrates
C) stings of rays D) electric organs of fishes
 
Answer & Explanation Answer: B) salivary glands of vertebrates

Explanation:

Here Homologous Means having the same relation or relative position or structure. 

Here in snakes poison is in glands and here salivary glands are in Vertebrates.

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3 94
Q:

The First step of Bacterial Replication is

A) Pinching of the plasma membrane B) Separation of daughter cells
C) Attachment of the DNA to the plasma membrane D) DNA Replication
 
Answer & Explanation Answer: D) DNA Replication

Explanation:

The First step of Bacterial Replication is DNA Replication.

DNA must be copied in order to proceed.

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