Which of these genetic processes may be most helpful in accounting for the Cambrian explosion?

#Question id: 4307

#SCPH01 Biochemistry

When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator?

#Question id: 11805

#SCPH05 I Biotechnology

P-proteins from the genus Cucurbita consist of two major proteins: PP1, the phloem filament protein, and PP2, the phloem lectin. Both PP1 and PP2 are thought to be synthesized in_______A___________and transported via the_______B_________to the_______C______, where they associate to form P-protein filaments and P-protein bodies.

#Question id: 8294

#I Life Science/ Life Sciences Group – I-V

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.

#Question id: 2971

#I Life Science/ Life Sciences Group – I-V

Which one of the following is the most appropriate match?

#Question id: 2071

#SCPH05 I Biotechnology

Diffusion of ions across membranes through specific ion channels is driven by: