321.

State four important functions of plasma membrane.

The main difference between Gram positive and Gram negative bacteria is

• cell membrane

• cell wall

• ribosome

• mitochondria

What is a genophore?

• DNA in prokaryotes

• DNA and RNA in prokaryotes

• DNA and protein in prokaryotes

• RNA in prokaryotes

Electrons used in electron microscope are of the wavelength

• 0.05 Å

• 0.15 Å

• 0.25 Å

• 0.30 Å

Which one of the following human cells do not contain mitochondria?

• Nerve cell

• Red blood cell

• Liver cell

• White blood cell

Which one of the following cells is not a phagocytic cell?

• Macrophage

• Monocyte

• Neutrophil

• Basophil

Numerical aperture of microscope lens is expressed by

• angular aperture only

• refractive index only

• both angular aperture and refrative index

• wave length of the light used

N-acetyl muramic acid is found in

• cell wall component of plant

• cell wall component of Gram positive bacteria

• cell wall component of fungi

• viral coat material

Identify the bacterium that appears violet after Gram staining

• Salmonella enterica

• Escherichia coli

• Mycobacterium tuberculosis

• Rhizobium meliloti

A major site for synthesis of lipids is

• RER

• SER

• symplast

• nucleoplasm