Question Discussion & Solution

Explanation:

• The virus which infects the bacteria is called bacteriophage.
• Bacteriophage was discovered by Twort & Filix
• It was named bacteriophage by D. Herelle.
• A bacteriophage is generally a double-stranded DNA virus
• In QB - bacteriophage - ss RNA is present.
• In ϕ X 174 - bacteriophage - ss DNA is present.
• A bacteriophage is of two types- Non-infective phages and infective phage.

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Additional Information

• The animal virus was discovered by Loeffler & Frosch.

The correct answer is website.

• Collections of many web pages are called websites.

Key Points

• It can also be said that a website or site is a location where a lot of web pages are kept.
• It is a place connected to the Internet where information about an organization is available.
• The World Wide Web (www) which is a part of the Internet consists of websites.
• A website is a book printed on the Internet, through which information can be given about something or some goods or services can be sold.

The correct answer is OMR.

Important Points

• Optical mark recognition
  • It is the input device used to scan a marked answer book of a multiple choice question paper.
  • An optical answer sheet or bubble sheet is a special type of form used in multiple-choice question examinations. 
  • Optical mark recognition is used to detect answers.

Additional Information

• OCR
  • ​OCR (Optical Character Recognition) recognizes all the characters from the paper document.
  • It collects and stores them into an editable document.
• ​MICR
  • ​The term magnetic ink character recognition (MICR) refers to the line of numbers that appears at the bottom of a check.
  • The MICR line is a group of three numbers, which are the check number, account number, and bank routing number.
• Card reader
  • A card reader is a data input device that reads data from a card-shaped storage medium.

The Correct Answer is The Speaker of the Lok Sabha.

Key Points

• A member of the Lok Sabha submits his/her resignation to the Speaker of the Lok Sabha.
• A Speaker is the presiding officer of the Lok Sabha.
• Usually, the speaker remains in office during the life of the Lok sabha.
• However, he can resign earlier by writing to the Deputy Speaker of the Lok Sabha.

Additional Information

• Resignation of the State Minister will be given to the Chief Minister who will consider it and forward it to the governor of the respective state.  

The correct answer is B12.

• Cobalamin is the scientific name of B12.

Key Points

• Vitamins:
  • It was first invented by FG Hopkins.
  • The term vitamin was coined by C Funk.
  • Vitamins provide no calories, they only regulate chemical reactions occurring in the metabolism of the body.
    • Water-soluble vitamins are Vitamin-B and Vitamin-C.
    • Fat-soluble vitamins are Vitamin-A, Vitamin-D, Vitamin-E and Vitamin-K. {Trick to remember: KEDA does not dissolve in water}
• Vitamin-B12:
  • Its chemical name is cobalamin.
  • Cyanocobalamin is a man-made form of vitamin B12.
  • Cobalt is found in Vitamin-B12. 
  • It is water-soluble.
  • Its deficiency causes Pernicious anaemia.
  • Its rich sources are Meat, poultry, fish, eggs, milk.

Additional Information​