All viruses contain the following two components: a nucleic acid genome and a protein capsid that covers the genome. Together this is called the nucleocapsid. The proteinous coat surrounds and protects the genetic material. In addition, many animal viruses contain a lipid envelope. The entire intact virus is called the virion.

Correct Option: A

All viruses contain the following two components: a nucleic acid genome and a protein capsid that covers the genome. Together this is called the nucleocapsid. The proteinous coat surrounds and protects the genetic material. In addition, many animal viruses contain a lipid envelope. The entire intact virus is called the virion.

Pneumonia is a bacterial disease caused by Streptococcus pneumoniae, a Gram-positive bacterium. It lives in the noses and throats of healthy people and can enter lungs through inhalation. Other important Gram-positive causes of pneumonia are Staphylococcus aureus and Bacillus anthracis.

Correct Option: B

Pneumonia is a bacterial disease caused by Streptococcus pneumoniae, a Gram-positive bacterium. It lives in the noses and throats of healthy people and can enter lungs through inhalation. Other important Gram-positive causes of pneumonia are Staphylococcus aureus and Bacillus anthracis.

Typhoid is a systemic infection caused by Salmonella Typhi, usually through ingestion of contaminated food or water. Typhoid is spread by eating or drinking food or water contaminated with the feces of an infected person. Risk factors include poor sanitation and poor hygiene.

Correct Option: B

Typhoid is a systemic infection caused by Salmonella Typhi, usually through ingestion of contaminated food or water. Typhoid is spread by eating or drinking food or water contaminated with the feces of an infected person. Risk factors include poor sanitation and poor hygiene.

Vitamin B contains nitrogen atoms that allow them to participate in regulating metabolism. For example, Vitamin B3 is a water soluble vitamin containing compound Niacin or Niacinamide, a nitrogen containing vitamin.

Correct Option: B

Vitamin B contains nitrogen atoms that allow them to participate in regulating metabolism. For example, Vitamin B3 is a water soluble vitamin containing compound Niacin or Niacinamide, a nitrogen containing vitamin.

Vitamin D is essential in helping the body absorb and use calcium; in fact, the body cannot absorb calcium at all without some vitamin D.Vitamin D helps our intestines absorb calcium from the food we eat and helps build stronger bones, partly by increasing the absorption of calcium.

Correct Option: B

Vitamin D is essential in helping the body absorb and use calcium; in fact, the body cannot absorb calcium at all without some vitamin D.Vitamin D helps our intestines absorb calcium from the food we eat and helps build stronger bones, partly by increasing the absorption of calcium.