List of practice Questions

Ethylbutyrate is responsible for the odor of pineapple. Which one of the following is the structure of ethyl butyrate? 

 

The number of polypeptide chains in a core nucleosome is ______.
While performing a PCR, the student forgot to add one of the two primers. The number of single-stranded DNA molecules produced after 25 PCR cycles is ______.
A double helical DNA molecule is composed of 32 mol% of adenosine. The mol% of cytosine in this DNA molecule is ______.
In a compound microscope, the magnification power of the objective lens is 100×, and that of the eyepiece (ocular lens) is 10×. The magnification power of the microscope is ______×.
In a population at Hardy–Weinberg equilibrium, for gene-X with two alleles, A and a, if the frequency of allele A is 0.2 and that of allele a is 0.8, the frequency of heterozygote genotype Aa in the population will be ______ (correct to 2 decimal places).
The molar concentration of water in pure water is _______ (rounded off to 1 decimal).
The number of triplet codon(s) for methionine is _______.
The number of peptide bonds in a 20-residue linear peptide is _______.
When the molecular weight of human immunoglobulin light chain is 24 kDa, the total molecular weight of human IgG is ______ kDa.
The maximum number of genotypes possible for gametes formed from a diploid cell of the genotype AaBbCcDd is ______.
The de Broglie wavelength of a proton moving at a speed of 1.0 m/s is ______ Å.
[Given: Planck’s constant = 6.626 × 10$^{-34}$ m$^2$kg/s; $m_p$ = 1.67 × 10$^{-27}$ kg]
The distance between the parallel lines $2x + 5y = 7$ and $2x + 5y = 15$ is ______ (rounded off to 2 decimals).
At 25°C and pH 7.0, the concentrations of glucose 1-phosphate and glucose 6-phosphate are 2.0 mM and 38 mM, respectively, at equilibrium. The standard free energy change for the conversion of glucose 1-phosphate to glucose 6-phosphate is ______ J/mol. [R = 8.315 J mol$^{-1}$ K$^{-1}$]
Which of the following is/are involved in the initiation of DNA replication?
Which of the following pairs is/are analogous structures?
A charged particle accelerated by a potential $V$ moves in a circular path with velocity $v$ in a uniform magnetic field $B$ perpendicular to motion. Which of the following is/are correct if the value of $V$ is increased?
1.45 g of sucrose (C$_{12}$H$_{22}$O$_{11}$) is dissolved in 30.0 mL of water. Molality (rounded off to 3 decimals) of the resulting solution is _______ m.
For a gene present on human chromosome 4, the maximum number of alleles that may be detected by sequencing the genome of 5 males and 10 females is _______.
The amount of hydrogen required to reduce 30 g of 2-butene is _______ g (rounded off to 2 decimals).
The difference between mitosis and meiosis I is
Infrared (IR) spectroscopy is used for determining certain aspects of the structure of organic compounds. Which of the following statement(s) is/are FALSE?
Cyclic AMP (cAMP) acts as a second messenger for which of the following primary signaling molecule(s)?
Which of the following is/are TRUE about the electron carrier, ubiquinone (coenzyme Q)?
Which of the following is/are common to both prokaryotic and eukaryotic gene expression?