List of practice Questions

The human genetic code is triplet in nature with 64 codons made using four nucleotides. If the human genetic code was doublet in nature, the number of codons theoretically possible from four nucleotides is ____. (Answer in integer)

In certain species of salamanders, male-female pairs have multiple mating partners in a breeding season. Which one of the following terminologies accurately describes this mating system?

Codon bias is correlated with the relative frequencies of which one of the following types of RNA?

Which one of the following tissues/organs is least likely to experience graft rejection when transplanted from a person to an unrelated person?

Which one of the following statements about gene expression is INCORRECT?

A fluorescence microscope with an objective lens of numerical aperture (NA) 1.5 is used with light of wavelength ((lambda)) 600 nanometers. The lateral resolution limit of this microscope rounded off to the nearest integer, is ____ nanometers.

A landfill sample was analyzed by dilution and plating techniques for viable bacterial count. When one gram of the landfill sample was diluted (1 times 10^4) (w/v) it yielded 400 CFU. The viable bacterial count (in million, rounded off to the nearest integer) in one gram landfill sample is ____.

At ( t = 0 ), the bacterial cell number is 10,000 cells/mL. At ( t = 480 ) minutes, the cell number increased to 320,000 cells/mL. The mean generation time during this exponential growth period, rounded off to the nearest integer is ____ minutes.

Which of the following is/are TRUE about the Escherichia coli chromosome?

At root nodules, which of the following C4 organic acid(s) is/are transported across the symbiosome membrane and into bacteroids?

Which of the following cocci is/are examples of division in one plane?

Which one of the following redox couples has the highest tendency to donate electrons?

Match the antibiotics in Group I with the microorganisms that produce them in Group II.

Which one of the following use inorganic compounds as an energy source?

Which one of the following double-stranded sequences will NOT be recognized by a Type IIP restriction endonuclease?

The most abundant class of immunoglobulins in serum is ________.

The mRNA of a hypothetical plant gene ( HSDU ) is 800-nucleotide long and encodes a protein of 160 amino acid residues. The calculated length of ( HSDU ) CDS would be ____ nucleotides (in integer).

In a genetic cross between two pure-line parents differing in the two independently segregating traits, plant height (tall vs dwarf) and flower color (purple vs white), all the F1 plants were tall with purple flowers. In a testcross population involving these F1 individuals, the expected percentage (%) of dwarf plants with purple flowers would be ______ (in integer).

Identify the CORRECT combination(s) between the enzymes in Group 1 and the reactions in Group 2 they catalyze.

The restriction map of a circular plasmid is shown below, along with the indicated distances between the restriction sites.

The plasmid was completely digested with EcoRI, and XhoI. The products were analysed by agarose gel electrophoresis followed by ethidium bromide staining. The number of bands that will be visible in the gel when exposed to UV light is __________.

Identify the {CORRECT combination(s) of plant natural products and the categories they belong to.}

Which of the following combinations of plant diseases and the types of their causal organisms is/are {CORRECT?}

Match the types of ecological energy productivity in Group 1 with their respective definitions in Group 2.

Match the types of ecological interactions in Group 1 with their respective definitions in Group 2.

Match the plant products in Group 1 with the plant species in Group 2 that produce them and the respective plant parts in Group 3 where they accumulate the most.