Q18 of 27 Page 1

Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria.

Lactobacillus bacteria are involved in setting milk to curd.


Process-


•The sugar in the milk i.e. lactose is acted upon and utilised by these bacteria.


•It leads to the oxidation of lactose into lactic acid which leads to partial digestion and coagulation of milk proteins to form curd.


Beneficial role of such bacteria –


They lead to an increase in Vitamin B12 content of curd and consumption of such curd leads to healthy gut.


More from this chapter

All 27 →
16

Explain the mechanism of DNA replication with the help of a replication fork. What role does the enzyme DNA-ligase play in a DNA replication fork?

OR


Construct and label a transcription unit from which the RNA segment given below has been transcribed. Write the complete name of the enzyme that transcribed this RNA.



 17

(a) Write two differences between Homo erectus and Homo habilis.

(b) Rearrange the following from early to late geologic periods :Carboniferous, Silurian, Jurassic.


 19

Bee keeping practice is a good income generating industry. Write the different points to be kept in mind for successful bee keeping. Write the scientific name of the most common Indian species used for the purpose.

 20

(a) Match the microbes listed under Column-A with the products mentioned underColumn-B.

Column – A Column – B


(H) Penicillium notatum (i) Statin


(I) Trichoderma polysporum (ii) ethanol


(J) Monascuspurpurea (iii) antibiotic


(K) Saccharomyces cerevisiae (iv) Cyclosporin-A


(b) Why does ‘Swiss Cheese’ develop large holes ?