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TLS Online TPP Program

#Question id: 7287

Following statements are regarding to the the floral quartet model and the underlying ABCDE model of organ identity determination in Arabidopsis thaliana.

A. Five floral organ identities (sepals, petals, stamens, carpels, and ovules) are specified by the formation of floral organ-specific tetrameric complexes of MADS-domain transcription factors that bind to two nearby enhancer elements, forming a DNA loop in between.

B. A complex of two class A proteins (APETALA 1) and two class E proteins  (SEPALLATA) determines petal identity.

C. A complex of one class A protein, one class E protein, and one of each of the class B proteins (APETALA 3 and PISTILLATA) determines sepal identity.

D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.D. A complex of one class E protein, two class B proteins, and one class C protein (AGAMOUS) determines stamen identity, while a complex of two class E proteins and two class C proteins determines carpel identity.

E. A complex of one class E protein, one class C protein, and one of each of the class D proteins (SHATTERPROOF and SEEDSTICK) controls ovule identity.

Which of the following combination are correct?

#Unit 5. Developmental Biology
  1. A and B
  2. A, B, and C
  3. A, B, C and D
  4. A, D and E
More Questions
TLS Online TPP Program

#Question id: 19793

#Unit 13. Advances in Biotechnology

The specificity of cry protein seems to be lost upon reduction of which amino acid residues of the protoxin, but can be restored by reoxidation of these residues?
TLS Online TPP Program

#Question id: 19794

#Unit 13. Advances in Biotechnology

The specificity of cry protein is lost upon reduction of cysteine residues of the protoxin, but can be restored by
TLS Online TPP Program

#Question id: 19795

#Unit 13. Advances in Biotechnology

Expression of BtR175 gene in mammalian cells enables Cry1Aa to bind the cells and cause their lysis. But upon what process this specificity can get lost?
TLS Online TPP Program

#Question id: 19796

#Unit 13. Advances in Biotechnology

The toxicity of cry protein toxins can be increased by the following approaches
1. Site directed mutagenesis within the toxin encoding region
2. Production of hybrid cry genes by fusing selected toxin domains of two or more different cry genes
Which of the following approaches could be correct?
TLS Online TPP Program

#Question id: 19797

#Unit 13. Advances in Biotechnology

 Which type of cry genes are used for the production of transgenic plants
TLS Online TPP Program

#Question id: 19798

#Unit 13. Advances in Biotechnology

Resistance to Cry proteins may be due to 
1. reduced binding of the toxin to midgut epithelium 
2. complete degradation of Cry proteins
3. Increased binding of the toxin to midgut epithelium 
4. Antisense inhibition of the transcript
Which of the following options is correct?