#Question id: 26945
#Unit 10. Ecological Principles
If the net reproductive rate is less then 1 than it represents____
#Question id: 2533
#Unit 2. Cellular Organization
Cellulose microfibrils have an ordered structure and are synthesized at the plasma membrane, given characteristics of microfibrils;
a) Each microfibril is composed of an estimated 18 parallel chains of (1,4)-linked β-D-glucose chains tightly bonded to each other to form a crystalline microfibril
b) Microfibrils have hydrophilic surfaces, populated by polar –OH groups extending from theplane of the sugar rings
c) Microfibrils have hydrophobic surfaces, populated by nonpolar C–H groups populating thesides of stacked glucose chains
d) microfibril important for enzymatic attack by microbial cellulases, which dock onto the hydrophobic surface and remove one glucan chain at a time
Which of the following from given characterstics of microfibrils is incorrect?
#Question id: 12916
#Unit 13. Methods in Biology
#Question id: 12721
#Unit 6. System Physiology – Plant
There are the five groups of late embryogenesis abundant (LEA) proteins found in plants
|
Group
(family name) |
Functional information |
|
I) Group 1 (D-19 family) |
a) It is an
abundant protein in cotton embryos, Each putative dimer of this group may
bind as many as ten inorganic phosphates and their counterions |
|
II) Group 2 (D-11 family) |
b) Possibly functions in ion
sequestration to protect cytosolic metabolism When LE25 is expressed in
yeast, it confers salt and freezing tolerance |
|
III) Group 3 (D-7 family) |
c) In tomato, a
gene encoding a similar protein is expressed in response to nematode feeding |
|
IV) Group 4 (D-95 family) |
d) Contains more
water of hydration than typical globular proteins Overexpression confers
water deficit tolerance on yeast cells |
|
V) Group 5 (D-113 family) |
e) Often
localized to the cytoplasm or nucleus More acidic members of the family are
associated with the plasma membrane May act to stabilize macromolecules at
low water potential |
#Question id: 14773
#Unit 13. Methods in Biology