List of practice Questions

Porins:
Which of the following antibiotics is produced by chemical synthesis?
Photosynthesis is a:
The prominent group of microorganisms involved in marine biocorrosion is:
A transducing phage differs from a regular bacteriophage in that it:
Which of the following is a selective medium for Gram-negative bacteria?
Which of the following statements about prions is true?
Which of the following is not a characteristic of anaerobic respiration in bacteria?
Which enzyme allows retroviruses to transcribe RNA into DNA?
The most common mode of transmission for diphtheria, pneumonia, and tuberculosis is through:
Which growth phase is characterized by the most rapid increase in cell number and maximal metabolic activity?
Which one of the following is most accurate for determining bacterial cell viability?
An application of biotechnology in agriculture involves the production of pest-resistant plants, using "cry" gene from a bacterium, \textit{Bacillus thuringiensis.} (a) Proteins coded by which specific Bt. toxin gene control corn borer? (b) How does Bt. toxin produced by the bacterium kill the insect? Explain.

Given below are few statements with reference to the ovaries of the human female reproductive system: 
(i) It is 2--4 cm in length and is connected to the pelvic wall by tendons. 
(ii) It is covered by a thin epithelium which encloses the ovarian stroma. 
(iii) The stroma is divided into a peripheral medulla and an inner cortex. 
(iv) The ovaries are the primary female sex organs that produce the female gamete (ovum). 
(v) Ovaries are located one on each side of the lower abdomen. 
Choose the option with all the true statements from the given options:

Name a blood related autosomal Mendelian disorder. Why is it called as Mendelian disorder? How is the disorder transmitted from parents to offspring?

Answer the following questions:

[(i)] Explain why the insecticidal protein produced by Bacillus thuringiensis does not kill the bacteria itself.

[(ii)] How has man exploited this protein to produce cotton bollworm-resistant Bt cotton plant?

[(i)] Identify the selectable markers labelled as ‘a’ and ‘b’ in the given diagram of E. coli vector.

[(ii)] How is the coding sequence of enzyme \(\beta\)-galactosidase considered a better marker than the ones identified by you in the diagram? Explain.
[(iii)] List any two uses of cloning vectors in biotechnology.

Assertion (A): To generate only a part of the plant from a cell is totipotency.
Reason (R): Suitable special nutrient media and sterile conditions are required in ‘in vitro’ conditions for the division of cells in explants.
Which enzyme(s) will be produced in a bacterial cell in which ‘UAG’ is inserted in the ‘lac-y gene’ due to mutation? Choose the correct option:
Assertion (A): Lymphocytes arise from the bone marrow and present in the blood and lymph serve as natural killer cells.
Reason (R): Lymphocytes migrate to thymus, where they develop into T-cells and begin to mature.
Large scale industrial production of citric acid for human welfare is done using the microbe:

Match the terms in Column-I with their description in Column-II and choose the correct option.

In a DNA, percentage of thymine is 20. What is the percentage of Guanine?
Unisexuality of flowers prevents which process?
Isolation of DNA from a bacterial cell can be achieved by using:

In the pedigree chart given below, what should be the genotype of the indicated member?