#Question id: 1524
#Unit 4. Cell Communication and Cell Signaling
Tumor-suppressor genes generally encode proteins that in one way or another inhibit cell proliferation. Loss-of-function mutations in one or more of these proliferation inhibitory proteins contribute to the development of many cancers. Prominent among the classes of proteins encoded by tumor-suppressor genes are:
A. Intracellular proteins that regulate or inhibit entry into the cell cycle
B. Receptors or signal transducers for secreted hormones or developmental signals that inhibit cell proliferation
C. Checkpoint pathway proteins that arrest the cell cycle if DNA is damaged
D. Proteins that promote apoptosis
Following genes belongs to the above class-
i. p53
ii. Rb
iii.TGF- β
iv. Caspase 3 and 7
which of the following match is correct?
#Question id: 1284
#Unit 4. Cell Communication and Cell Signaling
The collagen triple-helix domain is NOT:
#Question id: 804
#Unit 1. Molecules and their Interaction Relevant to Biology
With respect to microRNAs, which, if any, of the following statements, is false?
a) A microRNA normally works by binding to perfectly complementary sequences within an RNA transcript, usually an mRNA.
b) Like the great majority of mRNAs an miRNA is usually produced as a larger precursor RNA that is capped and has a 3’ poly(A) tail.
c) The precursor miRNA undergoes different types of post-transcriptional cleavage by endoribonucleases that are specific for double-stranded target sequences.
d) A nuclear endoribonuclease called dicer cleaves the miRNA precursor so that it forms a stem-loop RNA.
#Question id: 10241
#Unit 10. Ecological Principles
In an Asian rice paddy, carp eat decaying material from around the base of rice plants while a snail scrapes algae from the leaves, stems, and roots of the same plant. They can survive at the same time in the same rice paddy because they
#Question id: 5434
#Unit 8. Inheritance Biology
Plant height of wild Solanum nigrum is controlled by polygene. A pure line plant with 60 cm height was cross to pure line plant having 20 cm height .All F1 plant having uniform height 40 cm. F1 plant was allowed to self-fertilization to produced 4/64 proportional of F2 plant having height 20 cm . What is number of polygene governing plant height?