1. A and C    2. B and C     3.A and D    4.C and D

Ans.   1

Expln:- Resolving power of a microscope depends upon the numerical aperture of the objective lens system and its wavelength. Resolution of a microscope increases as the wavelength decreases, so ultraviolet light allows one to detect objects not seen with visible light. Similarly, the wavelength of light is much larger than the wavelength of electrons….

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1. express non-phosphorylatable form of Rb    2. express high levels of p⁵³-deubiquitinases    3.express inactive forms of G1/ S-cdks    4.express inactive forms of G1/S cyclins

Ans.   3

Expln:- When damage is sensed, the activity of the p⁵³ protein aids in the decision between repair and the induction of cell death (apoptosis).

As a transcription factor, p⁵³ stimulates the transcription of a group of target genes. Among them, p²¹ is one of the most important. The product of the p21 gene is a negative regulator of cyclin-dependent kinases, enzymes that are critical in the progression of the cell cycle and ultimately cell division. By stimulating the transcription of the p21 gene, p⁵³ prevents ….

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1. A and B            2. B and C

3.C and D            4.D and A

Ans.   1

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A. With elevated CO₂ levels, C₃ plants are much more responsive than C₄ plants under well watered conditions
B. In C₃ plants, increasing intracellular CO₂ partial pressure can stimulate photosynthesis only over a narrow range.
C.In C₄ plants, CO₂ compensation point is nearly zero

Which one of the following combination of above statments is correct ?
1. A and B    2. B and C    3.A and C    4.Only C

Ans.   3

Expln:- The C₄ plants show saturation at about 360 µ IL-1 while C3 responds to increased CO₂ concentration and saturation is seen only beyond 450 µ IL-1. Thus current availability of CO₂ levels is limiting to the C₃ plants.
In C₄ plants, the CO₂ compensation point is zero or nearly zero, reflecting their very low levels of photorespiration. In C₄ plants, photosynthetic rates saturate internal concentration values of about 15 pascals, reflecting the effective CO2 concentrating mechanisms operating in these plants. In C₃…. More Details Refer Simple Instant Notes

A. Ethylene regulates abscission
B. Gibberlins do not play any role in flowering
C.Auxin and cytokinin promote cell division
D.Over expression of cytokinin oxidase would promote root growth
E.ABA inhibits root growth and promotes shoot growth at low water potential
F.ABA promotes leaf senescence independent of ethylene

Which one of the following combination of above statements is correct ?
1. A, C and F    2. B, C and D     3.D, E and F     4.B, D and E

Ans.   1

Expln:- ABA promotes leaf senescence independently of ethylene. Abscisic acid was originally isolated as an abscission-causing factor. However, it has since become evident that ABA stimulates abscission of ogans in only a few species and that the primary hormone causing abscission is ethylene. On the other hand, ABA is…. More Details Refer Simple Instant Notes

A. Its hand would overshoot the target while reaching the bar
B. It would be unable to move forelimbs
C.It would show intention tremor while trying to press the bar
D.It would press the bar with mouth instead of hand

Which one of the following is correct ?
1. A and C     2. B only     3.D only     4.B and D

Ans.   1

Expln:- Cerebellum helps to provide smooth, coordinated body movement. The cerebellum processes input from other areas of the brain, spinal cord and sensory receptors to provide precise timing for coordinated, smooth movements of the skeletal muscular system. A stroke…. More Details Refer Simple Instant Notes

1. RNase condamination persisted in the system
2. cyclin B was missing from the system
3.ubiquitin ligase had been overexpressed
4.cyclin B lacking the cyclin destruction box had been overexpressed

Ans.   4

Expln:- Maturation-promoting factor(MPF) is also known as as mitosis-promoting factor. It is a heterodimeric protein, composed of cyclin B and cyclin-dependent kinase (Cdki). MPF promotes the entrance into mitosis from the G₂ phase by phosphorylating multiple proteins needed during mitosis. MPF is activated at the end of G₂ by a phosphatase known as Cdc 25, which removes an inhibitory phosphate group added earlier.
The G₂ checkpoint triggers the start of the M phase (mitosis). In order for this checkpoint to be passed, the cell has to check a number of factors to ensure the cell is ready for mitosis. If this checkpoint is ……….. More Details Refer Simple Instant Notes