List of top Questions asked in NEET (UG)

Which one of the following statements is not true about the universal rules of binomial nomenclature?

Which of the following statements are correct with reference to a transcription unit in DNA? A. A transcription unit in DNA is defined primarily by three regions: promoter, structural gene and terminator.
B. The promoter is said to be located towards the $5'$-end of the structural gene.
C. The promoter is a DNA sequence that provides binding site for RNA polymerase.
D. The promoter defines the template and coding strands.
E. The terminator is located towards the $3'$-end of the coding strand and it defines the end of the process of transcription.

Match List I with List II regarding the phases of the cell cycle and their activities:

Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction :

The main function of bulliform cells in grasses is :

Alpha-helix is found in which level of protein structure ?

Since the origin and diversification of life on Earth, there have been five episodes of mass extinction of species. How is the sixth extinction, which is in progress, different from the previous episodes ?

Match List I with List II :

List I                       List II
A. Productivity              I. Gross primary productivity minus respiration losses
B. Net primary productivity  II. Rate of formation of new organic matter by consumers
C. Gross primary productivity III. Rate of biomass production
D. Secondary productivity    IV. Rate of production of organic matter during photosynthesis

Choose the correct answer from the options given below :

Match List I with List II :

List I	List II
A. Genetically modified organism B. Thermostable DNA polymerase C. Ti plasmid D. pBR322	I. Agrobacterium tumefaciens II. Bt cotton III. Thermus aquaticus IV. Escherichia coli

Choose the correct answer from the options given below :

Exploring molecular, genetic and species-level diversity for products of economic importance is called :

In the {lac} operon, the {z} gene codes for :

In which one of the following, the ovules are not enclosed by an ovary wall and remain exposed ?

In angiosperms, root hairs arise from which one of the following regions of the root ?

The number of chlorine atoms present in the organic products $X$ and $Y$ of the following reactions respectively are: \[ {C6H6 + Cl2 →[Anhyd. AlCl3][dark] X} \] \[ {C6H6 + 3Cl2 →[500K] Y} \]

Given below are the reactions. Identify the reaction for which $K_p<K_c$:

Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature $T(K)$: \[ \ln k = 14.34-\frac{1.25\times10^4}{T} \] Given $R=1.987\text{ cal mol}^{-1}\text{K}^{-1}$. The activation energy of the reaction is:

The major product Z formed in the following sequence of reactions is:

$$ {C2H5Cl →[AgNO2] X →[Sn/HCl] Y →[(i)\ NaNO2][(ii)\ HCl,\ H2O] Z} $$

Phenolphthalein is used as an indicator for titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change observed at an alkaline pH close to equivalence point of this titration is:

The correct formal charges on oxygen atoms numbered $2,1$ and $3$, respectively, are:

Identify the incorrect statement from the following:

The calculated spin-only magnetic moment of $Ti^{2+}$ is:

Calculate emf of the half-cell given below: \[ Pt(s)\mid H_2(g,2\text{ atm})\mid HCl(aq,0.02M) \] \[ E^\circ_{H^+/H_2}=0V,\qquad \frac{2.303RT}{F}=0.059 \] \[ \log 2=0.3010 \]

In a test tube containing a salt, a few drops of dilute ${H2SO4}$ was added, which gave colourless vapours having the smell of vinegar. The vapours turned blue litmus paper red. Identify the correct anion from the following.

Identify the correct statement about $ClF_3$.

For a certain reaction $R\rightarrow$ Product, the plot of concentration $[R]$ versus time has a negative slope as shown. The order of reaction is: