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LEST WE FORGET: UNIT IX: BIOTECHNOLOGY
1. IVF leading to test tube baby is a part of biotechnology.
2. Genetic engineering, unlike traditional hybridization, allows us to isolate and
introduce only one or a set of desirable genes.
3. Plasmids and bacteriophages have the ability to replicate within bacterial cells
independent of the control of chromosomal DNA.
4. Ori is responsible for controlling the copy number of linked DNA.
5. Agrobacterium tumefaciens is a pathogen of dicot plants.
6. Since DNA is a hydrophilic molecule, it cannot pass through cell membranes.
7. In a continuous culture system, the cells are maintained in their
physiologically most active log/exponential phase.
8. Cellular totipotency in plants is the basis of plant tissue culture.
9. The method of producing thousands of plants through tissue culture is called
micropropagation.
10. Plants produced through tissue culture are somaclones.
11. Even if the plant is infected with a virus, the meristem (apical and axillary) is
free of virus.
12. Isolated protoplast can be fused to produce somatic hybrids.
13. RNAi takes place in all eukaryotic organisms as a method of cellular defense.
14. Enzyme replacement therapy and bone marrow transplant are not completely
curative options for treatment of ADA deficiency.
15. ELISA is based on the principle of antigen-antibody interaction.
16. Over 95% of all existing transgenic animals are mice.
17. Transgenic mice are being used to test the safety of polio vaccine.
18. Most of the industrialized nations are rich financially but poor in biodiversity
and traditional knowledge.
19. GEAC actually stands for Genetic Engineering Appraisal Committee.
*20. It is desirable to use restriction enzymes that make asymmetrical cut.
*21. Ethidium bromide is an intercalating agent commonly used as a fluorescent
tag in molecular biology laboratories for techniques such as agarose gel
electrophoresis.
*22. When creating recombinant DNA, it's crucial to cut both the donor DNA and
the vector DNA with the same restriction enzyme.
*23. Bacteria protect their own DNA from the action of their restriction enzymes
through a process called DNA methylation.
*24. Calcium is essential in creating the right conditions for bacterial cells to
become competent and successfully take up external DNA.
*25. Insertional inactivation is a widely used method in genetic engineering for
selecting recombinant transformants.
*26. It is beneficial for a plasmid to have multiple restriction sites, but ideally only
one for each enzyme.
*27. Gene therapy can be particularly effective for monogenic diseases because
replacing or correcting a single defective gene can potentially cure or mitigate
the disease.
*28. Insulin cannot be administered because it will be susceptible to degradation
by the digestive enzymes in the stomach and small intestine and will not be
absorbed in small intestine even if it survives digestive enzymes.
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Assertion (A): Many plant parts have the ability to regenerate into a whole plant.
Reason (R): This ability is due to the presence of meristematic cells, which are capable of continuous division.
Assertion (A): The sodium-potassium pump is crucial in generating the resting membrane potential of a cell.
Reason (R): The sodium-potassium pump allows equal movement of sodium and potassium ions across the membrane to maintain the resting potential.
Assertion (A) : The organic farmer holds the view that the eradication of the creatures that are often described as pests is undesirable.
Reason (R) : The eradication of the creatures that are often described as pests is not possible.
Statement I: A unit formed by the attachment of a base to 1' position of sugar is known as a nucleoside.
Statement II: When nucleoside is linked to phosphorous acid at 5' position of sugar moiety, we get nucleotide.
Assertion(A): In cymose type of inflorescence, the main axis is limited in growth.
Reason (R): In cymose type of inflorescence, the flowers are borne in a basipetal order.
Assertion (A): Plasmodium, the malarial parasite, is a protozoan.
Reason (R): It has an infectious spore like stage in its life cycle
Assertion (A): Water molecules require a carrier protein to facilitate their transport across the membrane.
Reason (R): Water is a polar molecule.
Why is glucose freely filtered at the glomerulus but not normally present in the urine?
Why is the loop of Henle described as a countercurrent multiplier?
Why does the filtrate become more concentrated while descending the loop of Henle?
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A plant with genotype AABBCCDD will produce how many different types of gametes? (Assume segregation and independent assortment)
Answer Key Morphology TF
1. (F). [NCERT-XI, Pg. 67]
2. (F), [NCERT-XI, Pg. 67]
3. (F), [NCERT-XI, Pg. 67]
4. (F), [NCERT-XI, Pg. 68]
5. (T), [NCERT-XI, Pg. 68]
6. (T), [NCERT-XI, Pg. 69]
7. (F), [NCERT-XI, Pg. 69]
8. (F). [NCERT-XI, Pg. 70]
9. (F), [NCERT-XI, Pg. 70]
10. (F), [NCERT-XI, Pg. 70]
11. (T). [NCERT-XI, Pg. 70]
12. (T), [NCERT-XI, Pg. 70]
13. (F), [NCERT-XI, Pg. 71]
14. (T), [NCERT-XI, Pg. 75]
15. (F), [NCERT-XI, Pg. 75]
16. (F), [NCERT-XI, Pg. 76]
