Which amino acid is least likely to participate in acid-base catalysis?

#Question id: 31014

#Unit 4. Cell Communication and Cell Signaling

If the insulin concentration rises fivefold to 2.5 × 10⁻¹¹ M, as it does after a meal, and the Kd for binding of insulin to its receptor on liver cells, 1.4 × 10⁻¹⁰ M (0.14 nM). What fraction of insulin receptors with bound insulin? 

#Question id: 758

#Unit 1. Molecules and their Interaction Relevant to Biology

Both miRNAs and one strand of siRNAs are bound by proteins to form a ribonucleoprotein complex called:

#Question id: 3383

#Unit 11. Evolution and Behavior

What does the study of analogous organ tell us about evolution?

A. This is the example of convergent evolution, occurred due to different group of organisms inhabiting same environments

B- Evolutionary change follow common pathway in two or more distinct species

C- Different organism get adopted to one environment

D- Similar group of organisms with mutations and variations getting naturally selected in different environments 

#Question id: 334

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about hydrogen bonding is not true?

#Question id: 28227

#Unit 5. Developmental Biology

At what condition stem cells may contribute to aging?