Practice Questions

TLS Online TPP Program

#Question id: 7103

Patterning of the Xenopus mesoderm along the dorso-ventral axis involves an antagonistic relationship between chordin and BMP-4. Is there an analogy here to dorso-ventral patterning in the Drosophila embryo?

#Unit 5. Developmental Biology

Yes, the Drosophila homolog of BMP-4, Decapentaplegic (Dpp), is antagonized by the Drosophila homolog of chordin, short gastrulation (Sog), in patterning of the dorso-ventral axis.
Yes, Drosophila also uses BMP-4 to specify ventral fates and chordin to specify dorsal fates.
Yes, the Drosophila Dorsal protein is identical to the vertebrate BMP-4 protein, and specifies the ventral region of the embryo.
No. the closest analogy from Drosophila would be the antagonism between Hunchback and Nanos, but neither of those are signalling molecules, and they act to pattern the antero-posterior axis.

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TLS Online TPP Program

#Question id: 11607

#Unit 6. System Physiology – Plant

How the active gibberellin GA1 is inactived by?

a) By hydroxylation remove GA20 from the biosynthetic pathway by converting it to GA1

b) conversion to GA8 by a hydroxylation on carbon 2

c) By hydroxylation remove GA20 from the biosynthetic pathway by converting it to GA29

TLS Online TPP Program

#Question id: 360

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is considered to be a strong base (alkali)?

TLS Online TPP Program

#Question id: 5736

#Unit 8. Inheritance Biology

Two zygote in which one A is 44+XYY and another B is 44+XXX karyotype is best described by

TLS Online TPP Program

#Question id: 3019

#Unit 2. Cellular Organization

During which phase of growth are bacteria most susceptible to antibiotics?

TLS Online TPP Program

#Question id: 52

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the incorrect option regarding Isomerism.