TLS Online TPP Program

#Question id: 10414


Plants have evolved with multiple photoreceptors, Phytochrome is one of them. Which of the following statements is incorrect about these photoreceptors?

#6. System Physiology – Plant
  1. Phytochrome in the functionally active dimeric form with a molecular mass of about 250 kDa
  2. phytochrome chromophore is a linear tetrapyrrole and absorbed light called phytochromobilin
  3. Phytochromobilin is exported  to the cytosol where it autocatalytically attaches to the PHY apoprotein through a thioether linkage to a cysteine residue
  4. Phytochromobilin undergoes to the cis and trans isomerisation with its pyrrole ring around C-12 and C-13 after absorbing light
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TLS Online TPP Program

#Question id: 12074

#7. System Physiology – Animal

Which of the following tends to increase potassium secretion by the cortical collecting tubule?

TLS Online TPP Program

#Question id: 12076

#7. System Physiology – Animal

Furosemide (Lasix) is a diuretic that also produces natriuresis. Which of the following is an undesirable side effect of furosemide due to its site of action on the renal tubule?

TLS Online TPP Program

#Question id: 12099

#10. Ecological Principles

According to the competitive exclusion principle, two species cannot continue to occupy the same

TLS Online TPP Program

#Question id: 12100

#10. Ecological Principles

Prairie dogs once covered the expanses of the Great Plains. Their grazing made the grass more nutritious for the huge herds of bison, and a variety of snakes, raptors, and mammals   preyed on the rodents. In fact, the black- footed ferret (now endangered) specialized in prairie dog predation. Today, growing housing and agricultural developments have covered many prairie dog towns. Which of the following statements about prairie dogs is true?

TLS Online TPP Program

#Question id: 12101

#10. Ecological Principles

The sum total of an organism's interaction with the biotic and abiotic resources of its environment is called its

TLS Online TPP Program

#Question id: 12102

#10. Ecological Principles

Use the following diagram of Joseph Connell's study of barnacle distribution in Scotland to answer the following two questions


Which of the following is the most logical conclusion about the distribution of the two species of barnacle, Chthamalus and Balanus?