Question

Suppose you observe an unknown bacterial culture in which the bacterial cells are round in shape and strung together in long strings. You would correctly describe it as?

		unknown (duh).
		staphylococci.
		streptococci.
		staphylobacillus.
		streptobacillus.

Which of the following is FALSE?

Viruses are generally larger than bacteria.

There are bacteria large enough to be seen without a microscope.

There are bacteria too small to be seen with a microscope.

The average bacteria cell is much smaller than most cells in the human body.

Prokaryotic cells comprise both the Archaean and Bacterial domains of life.

What is an antigen?

		Any structure/component of bacterial cells.
		A pathology microbe.
		An antibody generating substance.
		An antibody.
		A phagocytic cell of the immune system.

Answer 1

1)answer:streptococci.

Staphylococcus are spherical cocci arranged in clusters.

Streptococcus are round bacteria arranged in pairs or chains.

Staphylobacilli are rod shaped and arranged in clusters.

Streptobacilli are rod shaped and arranged in chains.

2)answer:viruses are generally larger than bacteria.

Virus are composed of DNA or RNA enclosed in protein. And are 100 times less than bacteria.

3)an antigen is any substance that induces an immune response and induces antibodies production.it may be a component of bacterial cell or microbes.