A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these statements explains why the pigweed reappeared?

TLS Online TPP Program

#Question id: 499

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following enzymes acts in the pentose phosphate pathway?

TLS Online TPP Program

#Question id: 11036

#Unit 7. System Physiology – Animal

Under control conditions, flow through a blood vessel is 100 ml/min under a pressure gradient of 50 mm Hg. What would be the approximate flow through the vessel after increasing the vessel diameter to four times normal, assuming that the pressure gradient was maintained at 50 mm Hg?

TLS Online TPP Program

#Question id: 31244

#Unit 5. Developmental Biology

Which of the following factor is capable of inducing the AER in the competent ectoderm between the dorsal and ventral sides of the embryo?

TLS Online TPP Program

#Question id: 910

#Unit 1. Molecules and their Interaction Relevant to Biology

Experiments on denaturation and renaturation after the reduction and reoxidation of the —S—S— bonds in the enzyme ribonuclease (RNase) have shown that:

TLS Online TPP Program

#Question id: 28672

#Unit 2. Cellular Organization

Which proteins is involved to inhibit Cdc25 phosphatase and hold it into inactive condition