Practice Questions

TLS Online TPP Program

#Question id: 7303

The ‘quartet model’ explains how the protein products of the ABCE-function genes might interact to control floral organ identity. Following statements are based on this model. Which one of them is incorrect?

#Unit 5. Developmental Biology

There are four combinations of floral MADS-box proteins. SEP proteins may form heterodimers with A (AP1) and B (AP3/ PI) proteins (for petals), B (AP3/PI) and C(AG) proteins (for stamens), and C (AG) protein (for carpels).
All these genes, with the exception of AP2 (and its homologues), are MADS-box genes, a broad family of eukaryotic genes that encode transcription factors containing a highly conserved DNA-binding domain (MADS domain).
The protein quartets are transcription factors and may function by binding to the promoter regions of target genes.
According to the model, one dimer of each tetramer recognize two different sites on the same DNA strand, thus bringing these areas into proximity via DNA-bending.

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TLS Online TPP Program

#Question id: 10139

#Unit 6. System Physiology – Plant

There are two distinct forms of rubisco. Form I is found in vascular plants, algae, and cyanobacteria; form II is confined to certain photosynthetic bacteria, Some statements about the Rubisco is given;

a.) A complex form I structure with eight identical large subunits each containing a catalytic site, and eight identical small subunits of uncertain function

b.) The form II rubisco of photosynthetic bacteria is simpler in structure, having two subunits that in many respects resemble the large subunits of the plant enzyme

c.) The plant enzyme has an exceptionally low turnover number; only three molecules of CO2 are fixed per second per molecule of rubisco at 25 o C

d.) Rubisco makes up almost 50% of soluble protein in chloroplasts and is probably one of the most abundant enzymes in the biosphere

Which of the following statements about rubisco will true?

TLS Online TPP Program

#Question id: 10140

#Unit 6. System Physiology – Plant

Following are certain statements regarding activated and inactivated form of Rubisco, Which one is INCORRECT?

TLS Online TPP Program

#Question id: 10141

#Unit 6. System Physiology – Plant

Rubisco is an essential phenomenon and its catalytic activity is regulated, which of following is wrong statement?

TLS Online TPP Program

#Question id: 10142

#Unit 6. System Physiology – Plant

Which of the following statements is INCORRECT?

TLS Online TPP Program

#Question id: 10143

#Unit 6. System Physiology – Plant

In the carbon assimilation reaction of photosynthesis, the biosynthesis of 1 molecules of glucose from the 6 molecules of carbon dioxide requires;

TLS Online TPP Program

#Question id: 10144

#Unit 6. System Physiology – Plant

Choose the incorrect statements about photosynthesis dark reaction ?