The second heart sound is produced by:

#Question id: 5830

#Unit 8. Inheritance Biology

Base-pair additions and deletions are collectively referred to as ___ due to their changes in base-pair triplets.

#Question id: 27152

#Unit 4. Cell Communication and Cell Signaling

Which of the following receptors is not a signalling receptor?

#Question id: 2119

#Unit 2. Cellular Organization

A sodium-potassium pump:

#Question id: 10161

#Unit 6. System Physiology – Plant

C₄ cycle has been associated with a particular leaf structure, called Kranz anatomy, typical Kranz anatomy exhibits an inner ring of bundle sheath cells around vascular tissues and an outer layer of mesophyll cells. This particular leaf anatomy generates a diffusion barrier that is

 a.) separates the uptake of atmospheric carbon in mesophyll cells from CO2 assimilation by rubisco in bundle sheath cells

 b.) limits the leakage of CO2 from bundle sheath to mesophyll cells

 c.) diffusion gradients—not only between but also within the cells—guide the shuttling of metabolites between the two compartments that operate the C4 cycle

 d.)  Bundle sheath cells surround the vascular tissue, while an outer ring of mesophyll cells is peripheral to the bundle sheath and adjacent to intercellular spaces and the percolates metabolites are transfer to the whole plant cell by vascular tissue

 Find out the correct statements of Krantz anatomy

#Question id: 70

#Unit 1. Molecules and their Interaction Relevant to Biology

The dimensions of living cells are limited, on the lower end by the minimum number of biomolecules necessary for function, and on the upper end by the rate of diffusion of solutes such as oxygen. Except for highly elongated cells, they usually have lengths and diameters in the range of