TLS Online TPP Program
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TLS Online TPP Program
#Question id: 14739
#Unit 4. Cell Communication and Cell Signaling
In heart muscle, activation series of the muscarinic acetylcholine receptor its effector K+ channel via the Gβγ subunit of a Gi protein.
a. Binding of acetylcholine triggers activation of the Gαi subunit and its dissociation from the Gβγ subunit in the usual way.
b. The released Gβγ subunit (rather than Gαi∙GTP) binds to and opens the associated effector protein, a K+ channel.
b. The increase in K+ permeability hyperpolarizes the membrane, which reduces the frequency of heart muscle contraction.
d. Activation is terminated when the GTP bound to Gαi is hydrolyzed (by a GAP enzyme that is an intrinsic part of the Gαi subunit) to GDP and Gαi∙GDP recombines with Gβγ.
TLS Online TPP Program
#Question id: 23104
#Unit 2. Cellular Organization
Which of the following statement is true regarding second level of organization
a. The second level of organization is the coiling of the 10-nm fiber of nucleosomes into a helical array.
b. The coiled helical array to constitute the fiber of diameter 30 nm that is found in interphase chromatin and in mitotic chromosomes.
c. This compacts the DNA - 40-fold. The structure of this fiber requires the histone tails and is stabilized by linker histones.
d. Histone H1, histone tails, and increased ionic strength all promote the formation of the 30-nm fiber.
TLS Online TPP Program
#Question id: 2768
#Unit 2. Cellular Organization
All the following steps are performed by the enzyme transposase during transposition of bacterial insertion sequences except
TLS Online TPP Program
#Question id: 18678
#Unit 13. Methods in Biology
which of the following technique can be analysed of PCR products from HIV-I allowed the identification of between 200 000 and 500 000 viral particles per cubic centimetre of serum.
TLS Online TPP Program
#Question id: 26843
#Unit 10. Ecological Principles
While studying the diversity of 3 communities, 5 species and 50 individuals were recorded from each community. The number of individuals under each species was listed as mentioned in the following Table. In which of the following community Pielou’s Evenness index (e) will be 1?
