The glucose uniporter GLUT1 has a Km of 1.5 mM for D-glucose and 30 mM for D-galactose.  At a concentration of 5 mM for each, what is the rate of glucose transport relative to galactose transport?  The Vmax may be assumed to be the same for both.

#Question id: 7218

#Unit 5. Developmental Biology

Following statements are regarding to convergent extension of the dorsal mesoderm in xenopus.

A. For convergent extension the first force is a polarized cell cohesion wherein the involuted mesodermal cells intercalate and the second force is differential cell cohesion.

B. The intercalations of mesodermal cells, both mediolaterally and radially, are stabilized by the planar cell polarity (PCP) pathway that is initiated by Wnts independent of β-catenin signaling.

C. The intercalations of mesodermal cells, are stabilized by the planar cell polarity (PCP) pathway that is initiated by Wnts dependent of β-catenin signaling.

D. Another factor regulating convergent extension is calcium influx from environment.

E. Ca2+ is released from intracellular stores and is required for convergent extension.

Which of the following combination is correct?

#Question id: 7245

#Unit 5. Developmental Biology

Gradients of Wnt are essential for normal regeneration of a head and a tail by planaria. Which one of the following statement is incorrect?

#Question id: 12142

#Unit 10. Ecological Principles

#Question id: 11338

#Unit 10. Ecological Principles

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

#Question id: 12746

#Unit 13. Methods in Biology