Virus

Which of the following is the best title for the passage.

• New Developments in Viral Research

• Exploring the Causes of Disease

• DNA: Nature’s Building Block

• Understanding Viruses

Before microbes were discovered It was believed that some diseases were caused by

• germ-carrying insects

• certain strains of bacteria

• foul odours released from swamps

• slimy creatures living near swamps

The word "proven" in line 4 is the closest meaning to which of the following.

• Shown

• Feared

• Imagined

• Considered

The word nature" is closest in meaning to which of the following?

• Self-sufficiency

• Shapes

• Characteristics

• Speed

The author implies that bacteria were investigated earlier than viruses because

• bacteria are easier to detect

• bacteria are harder to eradicate

• viruses are extremely poisonous

• viruses are found only in hot climates

All of the following may be components of a virus EXCEPT

• RNA

• plant cells

• carbohydrates

• a coat of protein