Biological Science - 2019 Past Year Paper - IIT JAM MCQ

In a plant species, yellow seed colour (Y) is completely dominant over white (y). A genetic cross between plants with yellow seeds and plants with white seeds yielded a progeny population of 48 yellow-seeded and 52 white-seeded plants. The genotypes of the yellow-seeded and the white-seeded parent plants, respectively, are most likely to be

Thomas Cech discovered RNA self-splicing in

The core glycan moiety of N-linked glycoproteins contains

Organophosphate pesticides kill insects by inhibiting

Which one of the following conditions leads to an approximately 50-fold increase in RNA transcription of the lac operon? (CRP stands for cyclic AMP [cAMP] receptor protein)
P: Binding of CRP-cAMP complex to a site near the lac promoter
Q: Binding of CRP-cAMP complex to a site near the lac operator
R: Lac repressor bound to the lac operator
S: Lac repressor not bound to the lac operator

Which one of the following photosynthetic organisms does not release oxygen as a by-product of the light reaction?

In plant systematics, which one of the following species belongs to the branch at the very base of the angiosperm phylogenetic tree?

The molecular weight (Da) of the zwitterionic form of the peptide GAGAGAGA is closest to

If y = x², then dx/dy is 

Which one of the following plots represents exponential growth?

Naive T lymphocytes can be stimulated by the activated dendritic cells that bear

In rearrangement of immunoglobulin heavy chain, N-nucleotides

Which one of the following matches is CORRECT between the microorganisms given in Group A with their requirement of oxygen in Group B?

Which one of the following is TRUE for the function
=
x² + 1?

Match the metabolic pathways in Group A with corresponding enzymes in Group B

Which one of the following statements is INCORRECT for competitive inhibition in an enzyme catalysed reaction?

In a human cell, β-oxidation of a saturated fatty acyl CoA molecule produced 8 acetyl CoA, 7 H₂O and 28 ATP. The oxidised fatty acyl CoA is 

Match the diseases in Group A with their corresponding causative microorganisms in Group B

In an experiment to examine the role of exopolymeric substances (EPS) on bacterial growth, a wildtype strain (S⁺) and a mutant strain deficient in EPS production (S⁻) were grown in monocultures as well as in co-culture (in equal proportion of S⁺and S⁻). The CFU (colony forming units) of these cultures measured after 24 hours are shown in the following figure.

Q. Which one of the following phenomena best describes the interaction between the wild-type strain (S⁺ ) and mutant strain (S⁻)?

If a fossil that has been discovered recently contains 0.2% of the that was present when the fossil was formed, then the age of the fossil in years is likely to fall in the range of

A photosynthetic algal filament is illuminated with white light that has passed through a prism such that the left and the right ends of the filament receive violet and red lights, respectively. The amount of oxygen released by this filament will be

Which one of the following statements is TRUE for dynein and kinesin family of motor proteins?

Which one of the following statements is TRUE about flagella?

Caffeine is a plant-based drug that

2,4-Dinitrophenol (DNP) is an uncoupler that

Which one of the following statements is INCORRECT about the prokaryotic and eukaryotic organisms on the Earth?

Which is the CORRECT chronological order, from the least recent to the most recent, of the four evolutionary events listed below?
P. Earliest evidence of terrestrial arthropods
Q. Appearance of  Ediacaran fauna
R. Extinction of the large, non-flying dinosaurs
S. Origin of mammals