prokaryotes & virus

A typical virus consists of

• a protein coat and a cytoplasm core

• a carbohydrate coat and a nucleic acid core

• a protein coat and a nucleic acid core

• a polysaccharide coat and a nucleic acid core

Which of these is the best description of a virus?

• a noncellular living organism

• one of the smallest bacteria known

• a member of the kingdom Virusae

• chemical complexes of RNA or DNA protected by protein

The viral infection cycle that will most rapidly cause cell destruction is called the _______ cycle.

• lysogenic

• lysozyme

• lytic

• lysol

Which statement is true about prokaryotes?

• They contain a single circular DNA molecule as the genetic material.

• They lack ribosomes.

• They usually lack a cell wall.

• They divide by mitosis.

Which definition of a relationship between bacteria and other organisms is NOT correct?

• A parasitic bacterium is one that can cause disease in a plant or animal.

• A symbiotic relationship is one in which the bacterium is usually free-living, but may become associated as a parasite in an animal under certain conditions.

• A mutualistic relationship is one in which each of the associated organisms derives benefit.

• A commensalistic bacterium lives on or in another organism without doing it any harm or any good, but the bacterium derives a benefit.

Prokaryotic cells are characterized by

• the lack of an organized nucleus (true nucleus).

• cells that can move by flagella.

• the lack of membrane-bound organelles.

• All of the choices are correct.

What is the most abundant organism on Earth?

• Eukaryotes

• Bacterias

• Archea

• Prokaryotes

What is the difference between bacterias Gram + or Gram -

• The attitude

• The cytoplasm color

• The cell wall composition

• The shape of the bacteria

• Gram + Staphylococci

• Gram - Streptococci

• Gram - Staphylococci

• Gram + Streptococci

• Gram + Streptobacillus

• Gram - Streptococci

• Gram - Staphylobacillus

• Gram -

  Streptobacillus