1 True or False. Justify your answer a. Biofilms are bacteria that grow in suspe

Question

1 True or False. Justify your answer

a. Biofilms are bacteria that grow in suspension.

b. In enzyme kinetics Vmax is dependent on Km.

c. Nuclear organization has no effect on DNA replication

d. Only bacteria produce and respond to quorum sensing molecules

e. A total genomic library will be larger than a cDNA library for a given cell.

f. The proteins in neurons and white blood cells are completely different.

g. Hunchback and Caudal are maternal affect genes that are translationally regulated.

h. Extranucleosomal DNA has no effect on histone methylation.

i. Parental imprinting can carry over into future generations.

j. Entropy of water is the driving force behind assembly of lipids into membranes.

Explanation / Answer

ans-a- True- biofilms are group of Bacteria that forms slimy layers on surface of the living or non livimg things eg rock in a pond,a human tooth,mucous membrane,idustries and hospitals, which resides in a matrix made up polysaccharides, DNA and proteins.A biofilm usually started to form when a free-swimming or planktonic bacteria attaches to a surface.

b-True- Vmax is dependent on the enzyme concentration and Km

Km= 1/2Vmax

if we increase the enzyme concentration Vmax increases and Km also increases

D-True- Bcateria can communicate with other bacteria and behave co-operatively.Quorum sensing is the cell to cell communication between bacteria.Quorum sensing divided into 4 steps-

e- True- Genomic library contains all possible fragmants of DNA or genomic DNA from a given organismm, and cDNA library is a combination of cloned complemetary DNA which carries only expessed gene sequence.

f-True- Both ( proteins in neurons and white blood cells) are completely different because neuron recieve and respond to electrical signals where as WBCs involved in the immune response to infection and moves freely through out the body this is due to the neurons express some mRNA and WBCs does not.

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