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Which of the following is not consistent with the base pairings in a double stranded DNA molecule?
1. The number of C equals the number of G
2. The number of A equals the number of T
3. The amount of purine is equal to the amount of pyrimidines
4. The ratio of (G+C) to (A+T) is same for each species

In guard cells when sugar is converted into starch, the stomatal pore
1. Opens partially
2. Closes completely
3. Opens completely
4. Remains unchanged

Consider the following:
I Facilitation of uptake and utilization of calcium by plants
II. Cell elongation and cell differentiation
III. Nitrogen metabolism
IV. Carbohydrate translocation
V. Water splitting reaction in photosynthesis
The functions of Boron in plants will include:
1. I,II, III, IV
2. I, II, IV
3. II, III, IV
4. I, III, V

In the C4 pathway, which of the following molecules combines with carbon dioxide?
1. glyceraldehyde phosphate
2. ribulose biphosphate
3. phosphoenol pyruvic acid
4. citric acid

Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed?
1. pyruvate (present)-oxygen (present)-ATP levels (high)
2. pyruvate (present)-oxygen (present)-ATP levels (low)
3. pyruvate (present)-oxygen (absent)-ATP levels (high)
4. pyruvate (absent)-oxygen (present)-ATP levels (low)

Gastric secretion is stimulated by all except
(1) Secretin
(2) Gastric distension
(3) Gastrin
(4) Vagal stimulus

Which of the following does not shift the oxy-haemoglobin dissociation curve to the right?
1. increased pH
2. increased carbon dioxide
3. increased temperature
4. increased 2,3 -DPG

When type B agglutinogen is not present on the surface of RBC of a person, his plasma would contain ____ agglutinins.
1. Anti-a                          2. Anti-b
3. Both anti-a and anti-b   4. None

Oxalates and citrates are used as anticoagulants in stored blood because they:
1. Chelate calcium ions
2. Act as competitive inhibitors of vitamin K
3. Potentiate anti-thrombin III
4. Activate heparin

What is used as an osmolyte in human beings to increase medullary interstitial osmolality during concentration of urine?
1. TMAO
2. Urea
3. Both a and b 
4. Uric acid

A solution of (+)-1 chloro-1-phenylethane in toluene racemizes slowly in the presence of small amount of SbCl₅ due to formation of
1. carbanion           2. carbene
3. free radical          4. carbocation

Which has highest normality?
1. 1MH₃PO₂
2. 1MH₃PO₃
3. 1MH₃PO₄
4. All of these
 

The strongest acid, among the compounds given below, is:

Which of the following will give yellow precipitate with I₂/NaOH?

1.	CH3-CO-O-CO-CH3	2.
3.		4.	Both (2) and (3)

The dimensional formula of the coefficient of thermal conductivity is :
1.  $\left[{\mathrm{M}}^1{\mathrm{L}}^1{\mathrm{T}}^{-3}{\mathrm{K}}^{-1}\right]$
2.  $\left[{\mathrm{M}}^3{\mathrm{L}}^{-1}{\mathrm{T}}^{-3}\mathrm{K}\right]$
3.  $\left[{\mathrm{M}}^1{\mathrm{L}}^{-3}{\mathrm{T}}^{-1}{\mathrm{K}}^{-1}\right]$
4.  $\left[{\mathrm{M}}^1{\mathrm{L}}^1{\mathrm{T}}^{-3}\mathrm{K}\right]$

A simple pendulum hangs from the roof of a train moving on horizontal rails. If the string is inclined towards the front of the train, then train is-
1. Moving with constant velocity
2. In accelerated motion
3. In retarded motion
4. At rest

A ball is thrown upward with a certain speed. It passes through the same point at 3 second and 7 second from the start. The maximum height achieved by the ball is:
1.  500 m
2.  250 m
3.  125 m
4.  450 m

A particle is projected at an angle $\theta$ with horizontal with an initital speed u. When it makes an angle $\alpha$ with horizontal, its speed v is-
1. $u\cos \theta$
2. $u\cos \theta u\cos \alpha$
3. $\frac{u\sin \theta }{\sin \alpha }$
4. $\frac{u\cos \theta }{\cos \alpha }$
 

Species in which central atom is sp² hybridised
1. (CH₃)₃N
2. (SiH₃)₃N
3. (SiO₂)_n
4 :NH₃