#Question id: 4920
#Unit 8. Inheritance Biology
In Neurospora, the mutant stp exhibits erratic stop-and start growth. When a female of stp strain is crossed with a normal strain acting as a male, all progeny individuals' showed stp mutant phenotype. However, the reciprocal cross resulted in all normal progeny, individuals. These results can be explained on the basis of
A. Uniparental gene contribution
B. Nuclear inheritance with concept of dominance
C. Sex link character
D. stp mutation may be located in chloroplast DNA
The most appropriate statement or combination of the above statements for explaining the experimental results is:
#Question id: 4663
#Unit 3. Fundamental Processes
Which two polymerases function in transcriptional repression directed by nuclear siRNAs in plants?
#Question id: 4680
#Unit 3. Fundamental Processes
A protein is a transcriptional activator, which binds to a site upstream of a promoter called PRE and stimulates transcription of the cI (repressor) gene. This activator protein is
#Question id: 1513
#Unit 4. Cell Communication and Cell Signaling
The kinase activity of ATM is activated in response to DNA damage due to various stresses (e.g., UV irradiation, heat). Activated ATM then triggers following pathways leading to arrest in G1.
A. Chk2 is phosphorylated and, in turn, phosphorylates Cdc25A, thereby marking it for degradation and blocking its role in CDK2 activation.
B. Phosphorylation of p53 stabilizes it, permitting p53-activated expression of genes encoding proteins that cause arrest in G1, promote apoptosis, or participate in DNA repair.
C. Controlling the pool of p53, ATM phosphorylates MDM2 to inactivate it, causing increased stabilization of p53. Another protein p14ARF inhibits the activity of Mdm2 thus stabilizing p53.
Based on the above information, which one of the following statements is correct?
#Question id: 28629
#Unit 2. Cellular Organization
Cln3-CDK complexes phosphorylate and inactivate which of the protein ?