#Question id: 398
#Unit 1. Molecules and their Interaction Relevant to Biology
One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). (See figure.)
If the pH of blood drops, one would expect ________.
#Question id: 1382
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to cell-cell and cell–extracellular matrix junctions and their adhesion molecules.
A. Adherens junctions and desmosomes are integrin-containing anchoring junctions that bind the membranes of adjacent cells, giving strength and rigidity to the entire tissue.
B. Hemidesmosomes are cadherin-containing anchoring junctions that attach cells to elements of the underlying extracellular matrix.
C. Integrins are a large family of αβ heterodimeric cell-surface proteins that mediate both cell-cell and cell-matrix adhesions and inside-out and outside-in signaling in numerous tissues.
D. Tight junctions block the diffusion of proteins and some lipids in the plane of the plasma membrane, contributing to the polarity of epithelial cells. They also limit and regulate the extracellular (paracellular) flow of water and solutes from one side of the epithelium to the other.
Which of the following statements are incorrect?
#Question id: 4344
#Unit 3. Fundamental Processes
How does the transcription of structural genes in an inducible operon occur?
#Question id: 3641
#Unit 3. Fundamental Processes
The point at which separation of the strands and synthesis of new DNA takes place is known as the:
#Question id: 4829
#Unit 8. Inheritance Biology
Plant with genotype AaBb is selfed . the two gene are linked and are 50 map units apart. What proportion of progeny will have the genotype aabb?