Select a cellular body which is NOT a part of the nuclearbodies:
Anonymous Poll
30%
P-bodies
17%
Nucleolus
31%
Cajal bodies
22%
Interchromatin granule clusters
Which one of the following statements about chromatin is NOT true?
Anonymous Poll
12%
DNA winds approximately 1.65 times around the nucleosomes
38%
H2A-H2B bind to both the entry and exit ends of DNA in nucleosomes
18%
Covalent modification of histones influence chromatincompaction
32%
Non-histone proteins are part of mitotic chromosomes
Which one of the following 𝜆 proteins acts both as anactivator and repressor of transcription?
Anonymous Poll
26%
cI protein
28%
N protein
33%
cII protein
13%
Q protein
A highly specific inhibitor that targets the phosphorylation activity of TFIIH is added to an in vitro transcription reaction. Which one of the following steps is most likely to be affected?
Anonymous Poll
32%
Binding of RNA polymerase to promoter sequence
32%
Promoter clearance
24%
Recruitment of TFIID
12%
Open promoter complex formation
Proteins with cytoplasmic domains having tyrosine kinaseactivity do NOT act as receptors for
Anonymous Poll
15%
Epidermal growth factor (EGF)
26%
Platelet-derived growth factor (PDGF)
23%
Insulin
36%
Transferrin
Which one of the following is a group of signalling molecules that act as morphogens during development of an organism and its effects are mediated through the receptor Patched and its binding partner Smoothened?
Anonymous Poll
54%
Hedgehog protein
20%
Notch protein
15%
Wnt protein
11%
𝛽-catenin
Which one of the following human serum immunoglobulins takes part in classical complement fixation pathway?
Anonymous Poll
11%
IgD
29%
IgE
23%
lgA
36%
IgG
Based on ABC model during flower development, loss of class A activity results in the formation of only stamen and carpel. Which of the following floral organ identity genes controls the class A activity?
Anonymous Poll
53%
APETALA 1 and APETALA 2
32%
APETALA 3 and PISTILLATA
11%
Only PISTILLATA
5%
Only AGAMOUS
👍1
Which one of the following is NOT a phenotype of dark-grown seedlings that are etiolated?
Anonymous Poll
32%
Short hypocotyls
21%
An apical hook
24%
Closed cotyledons
23%
Non-photosynthetic proplastids
Which one of the following is the correct function of JAZ (JASMONATE ZIM- DOMAIN) protein family, a key regulator of Jasmonic Acid (JA) signalling response?
Anonymous Poll
28%
Binds to MYC2 and represses the JA dependent genes.
46%
Binds to MYC2 and transcribes JA dependent genes.
20%
Acts as receptor of JA signal.
6%
Involved in directly inducing JA dependent genes.
For an enzyme to have high catalytic efficiency, it must have
Anonymous Quiz
19%
high turnover number and high Km
61%
high turnover number and low Km
18%
low turnover number and high Km
2%
low turnover number and low Km
High doses of caffeine can interfere with the DNA replication checkpoint mechanism in mammalian cells. Assume
that a cup of coffee (200 ml) contains 100 mg of caffeine (mol wt. 200 g/ mol). How many cups of coffee will contain 10 mmole of caffeine?
that a cup of coffee (200 ml) contains 100 mg of caffeine (mol wt. 200 g/ mol). How many cups of coffee will contain 10 mmole of caffeine?
Anonymous Poll
33%
20
33%
52
25%
12
9%
4
Carboxypeptidase is a single polypeptide of 307 amino acids and contains two essential amino acids Arg 145 & Glu 270 in its active site bearing a single alpha helix. If carboxypeptidase is a perfect alpha helix, distance between the two amino acids
Anonymous Poll
38%
187.5 Å
31%
347 Å
21%
600 Å
10%
102 Å
Tetrodotoxin is generally known as
Anonymous Poll
45%
voltage gated Na+ - channel blocker
22%
K- channel blocker
29%
voltage- gated Na channel stimulant
4%
K- channel stimulant
A fluorescently labelled plasma membrane protein within a cell was monitored under a microscope. If the cells
were treated with Brefeldin A, an inhibitor of ER to golgi transport, the membrane protein would be mainly found in
were treated with Brefeldin A, an inhibitor of ER to golgi transport, the membrane protein would be mainly found in
Anonymous Poll
29%
(1) plasma membrane
27%
(2) golgi stacks
36%
(3) ER
7%
(4) lysosomes
All of the following statements about actin assembly are correct except
Anonymous Poll
16%
(1) ADP-actin can assemble into filaments
30%
(2) actin subunits can treadmill through an actin filament
22%
(3) actin assembly can produce force for movement
32%
(4) actin (-) ends assemble more rapidly than actin (+) ends
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In E. coli, the inability of the lac repressor to bind an inducer would result in
Anonymous Poll
27%
(1) no substantial synthesis of β-galactosidase
44%
(2) constitutive synthesis of β -galactosidase
24%
(3) inducible synthesis of β -galactosidase
5%
(4) synthesis of inactive β -galactosidase
When bacteria produce mammalian proteins, cDNA is used rather than genomic DNA. Which of the following is
the best explanation?
the best explanation?
Anonymous Quiz
30%
(1) It is easier to clone cDNA than genomic DNA of comparable size.
16%
(2) It is easier to clone RNA than DNA.
17%
(3) It is not possible to clone the entire coding region of the gene.
37%
(4) Most eukaryotic genes have introns that cannot be removed in bacteria.