#Question id: 761
#Unit 1. Molecules and their Interaction Relevant to Biology
In a DNA double helix each type of base forms a stable base pair with only one type of base. When bases on an RNA strand are involved in base pairing, which bases can form stable base pairs with more than one type of base?
#Question id: 1296
#Unit 4. Cell Communication and Cell Signaling
People with a defect in the synthesis of the integrin β2 subunit exhibit reduced:
#Question id: 18896
#Unit 13. Methods in Biology
#Question id: 1375
#Unit 4. Cell Communication and Cell Signaling
Four ECM ubiquitous protein components, each of which comprises multiple, distinct, repeating domains, are found in basal laminae. Given below are a list of some extracellular matrix (ECM) proteins in column A and their characteristics in column B.
|
Column A |
Column B |
|
a. Type IV collagen |
i. a large multidomain proteoglycan that binds to and cross-links many ECM components and cell-surface molecules. |
|
b. Laminins |
ii. a rodlike molecule that cross-links type IV collagen, perlecan, and laminin, which helps incorporate other components into the ECM and also stabilizes basal laminae. |
|
c. Perlecan |
iii. a family of multi-adhesive, cross-shaped proteins that form a fibrous two-dimensional network with type IV collagen and that also bind to integrins and other adhesion receptors. |
|
d. Nidogen |
iv. trimeric molecules with both rodlike and globular domains that form a two-dimensional network. |
Which one of the following is the most appropriate match?
#Question id: 3494
#Unit 11. Evolution and Behavior
Which of the following is a disadvantage of group living for many species?
a. Competition between individuals for resources is increased
b. It can reduce predator success
c. It can reduce reproductive success
d. It increased transmission of parasites and other diseases