Question

Which of the following statements is correct?
A. Catalytic converters can separate particulate matter of diameter less than 2.5 micrometers
B. Histones are acidic in nature that form the core for DNA packaging.
C. Lactobacillus is not present in dough used in idli formation
D. Templates with polarity 5’-3’ have continuous DNA replication.

Answer 1

The catalytic converters can convert unburnt hydrocarbons into carbon dioxide and water. Lactobacillus is the bacteria that turns milk into curd. Histone proteins help in DNA packaging.

Complete step by step answer: The catalytic converts help in reducing atmospheric pollution by converting harmful unburnt hydrocarbons into less toxic forms. It converts carbon monoxide into carbon dioxide, nitric oxide to nitrogen gas, and hydrocarbons to carbon dioxide and water.
-Histone proteins are basic proteins that are positively charged in nature. DNA also contains less positively charged proteins called non-histone proteins. Histone proteins are rich in amino acids such as lysine and arginine. These amino acids have positively charged components in their side chains and are responsible for the positive charge of histone proteins.
-Lactobacillus is a gram-positive bacteria that produces lactic acid. It is present in the normal flora of bacteria seen in our gut. Lactobacillus is actually good for our health. It helps us by preventing the growth of certain microbes that are harmful to our health. It also helps in the absorption of some vitamins from the gut.
-DNA replication is the process by which new DNA is synthesized from pre-existing DNA. During replication, DNA is unwound up to a point and it appears to be a Y-shaped structure called the replication fork. Two types of strands are formed during replication. They are leading strand and lagging strand. In the leading strand, DNA replication is continuous and the template has 3’-5’ polarity. On the other hand, in lagging strands, several small fragments are made that are later joined by enzyme DNA ligase.
Hence the correct option is C.

Note: Yeast is a type of fungus that is present in dough in the process of fermentation. Here, yeast converts sugars present in the dough into simpler substances. They are used in the preparation of alcohol and also in the process of baking.