#Question id: 4429
#Unit 3. Fundamental Processes
A mutant is made that removes the CTD domain of RNA Polymerase II. Which are likely reasonable consequences? CHOOSE THE ONE BEST ANSWER
#Question id: 5146
#Unit 5. Developmental Biology
Choose the correct match.
|
Process |
Definition |
|
a. Epithelial-mesenchymal transition |
i. The phenomenon, whereby cells intercalate to narrow the tissue and at the same time lengthen it. |
|
b. De-adhesion |
ii. The process in which cells that had formerly been part of an epithelium lose their attachments and become individual, migrating cells. |
|
c. Permissive interaction |
iii. The cadherins that couple epithelial cells together are degraded, thereby allowing the cells to become free from their neighbors. |
|
d. convergent extension |
iv. The responding tissue has already been specified and needs only an environment that allows the expression of these traits. |
#Question id: 185
#Unit 1. Molecules and their Interaction Relevant to Biology
Match the amino acids with their correct functional group:
|
1. Indole |
i. Histidine |
|
2. Imidazole |
ii. Tryptophan |
|
3. Thiol |
iii. Cysteine |
|
4. Pyrrolidine |
iv. Proline |
#Question id: 5140
#Unit 5. Developmental Biology
Following statements regarding to the Ectodermal competence and the ability to respond to the optic vesicle inducer in Xenopus.
A. The optic vesicle is able to induce lens formation in the posterior portion of the ectoderm but not in the anterior portion.
B. If the optic vesicle is removed, the surface ectoderm forms either an abnormal lens or no lens at all.
C. Only head ectoderm is competent to respond to the signals from the optic vesicle by producing a lens.
D. The head ectoderm appears to secrete two paracrine factors BMP 4 and FGF8, which involves in the activation of lens-specific genes such as crystallin.
Which of the following combination is incorrect?
#Question id: 1602
#Unit 4. Cell Communication and Cell Signaling
Following are some of the characteristics of MHC 1 and MHC 2 both , except