Tag: health and hygiene

Quizzes (46) Questions (12)

Questions Related to health and hygiene

Multiple choice biology health and hygiene minerals and vitamins nutrition and diet role of various nutrients

A bacterial population contains a mixture of wild type and leucine auxotrophs. From this mixture, the leucine auxotrophs can be enriched by growing the mixture in minimal medium supplemented with 

  1. leucine

  2. penicillin

  3. leucine and penicillin

  4. chloramphenicol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Penicillin kills actively growing cells by inhibiting cell wall synthesis. Wild type cells grow in minimal medium and are killed by penicillin, whereas leucine auxotrophs cannot grow without leucine and thus remain dormant, surviving penicillin selection.

Multiple choice biology health and hygiene minerals and vitamins nutrition and diet role of various nutrients

Our hair and nails are composed of _________.

  1. Carbohydrates

  2. Proteins

  3. Vitamins

  4. Fat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Hair and nails are made up of dead squamous cells which are called as keratinocytes. It consists of a protein known as keratin and is present in hair, nails and skin. It helps in protection as composed of intact cells.
So, the correct answer is 'Proteins'.