In the plant Arabidopsis, the loci for pod length (L, long; l, short) and fruit hairs (H, hairy; h, smooth) are linked 16 map units apart on the same chromosome. The following crosses were made:

(i) L H/L H X l h/l h = F1

(ii) L h/L h X l H/l H = F1

If the F1’s from (i) and (ii) are crossed, what proportion of the progeny are expected to l h/l h?

#Question id: 15298

#Unit 5. Developmental Biology

#Question id: 26572

#Unit 3. Fundamental Processes

Choose the following is incorrect statement about Polycomb or Pc-G proteins

a. Pc-G proteins do not initiate repression

b. Pc-G proteins initiate repression

c. They are responsible for maintainingrepression 

d. There are Polycomb repressive complexes: PRC1 and PRC2

e. PRC2 complexes contain histone deacetylases that inhibit transcription

f. PRC1 complex binds the methylated nucleosomes 

g. The PRC1 complex contains a ubiquitin ligase 

#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: 2622

#Unit 2. Cellular Organization

The form of RNA polymerase that transcribes the glnA gene contains the

#Question id: 17287

#Unit 13. Methods in Biology