#Question id: 10360
#Unit 6. System Physiology – Plant
How much ATP require in the nitrogen fixation or conversion of ammonium assimilation in the system?
#Question id: 24496
#Unit 3. Fundamental Processes
Lariat formation is characterized by
#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: 11850
#Unit 6. System Physiology – Plant
The first step in polar transport is auxin influx. According
to the model, auxin can enter plant cells from any direction by either of two
mechanisms:
a) Passive diffusion of the protonated (IAAH) form across
the phospholipid bilayer
b) Secondary active transport of the dissociated (IAA–) form
via a 2H+–IAA– symporter
c) Active diffusion of the protonated (IAAH) form across the
phospholipid bilayer
Find out the correct statements of about diffusion of IAA.
#Question id: 2905
#Unit 2. Cellular Organization
With respect to X-chromosome inactivation, which, if any, of the following statements are not correct?
I. X-chromosome inactivation in mammals begins in the pre-implantation embryo
II. In humans all diploid cells that carry two normal X-chromosomes are subject to a random pattern of X-inactivation.
III. Once a decision has been made to inactivate an X chromosome (either the paternal or maternal X), all descendant cells show the same pattern of X-inactivation.
IV. The inactivated X chromosome becomes a highly condensed Barr body in which genes are silenced across the length of the chromosome.