Practice Questions

TLS Online TPP Program

#Question id: 7265

Following statement regarding to the cascade of regulated RNA splicing controls drosophila sexual differentiation.

A. The Sex-lethal (Sxl) protein, encoded by the sex-lethal gene, is the first protein to act in the cascade and present only in female embryos.

B. Early in development, the Sxl gene is transcribed from a promoter that functions only in male embryos.

C. Later in development, this male-specific promoter is shut off, and another promoter for sex-lethal becomes active in both male and female embryos.

D. In male embryos, however, in the absence of early Sxl protein, exon 3 of the sex-lethal pre-mRNA is spliced to exon 2 to produce an mRNA that contains a stop codon early in the sequence.

Which of the following is correct?

#Unit 5. Developmental Biology

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#Question id: 13227

#Unit 6. System Physiology – Plant

Match the following Special Techniques Are Used in Nutritional Studies;

A.) Hydroponic growth system	1.) plant roots lie on the surface of a trough, and nutrient solutions flow in a thin layer along the trough over the roots and this system ensures that the roots receive an ample supply of oxygen
B.) Nutrient film growth system	2.) In this technique, plants are grown with their roots suspended in air while being sprayed continuously with a nutrient solution, This approach provides easy manipulation of the gaseous environment around the root
C.) Aeronic growth system	3.) The technique of growing plants with their roots immersed in nutrient solution without soil and requires a large volume of nutrient solution or frequent adjustment of the nutrient solution to prevent nutrient uptake by roots from producing radical changes in nutrient concentrations and pH of the medium.

1.) plant roots lie on the surface of a trough, and nutrient solutions flow in a thin layer along the

trough over the roots and this system ensures that the roots receive an ample supply of oxygen

2.) In this technique, plants are grown with their roots suspended in air while being sprayed continuously

with a nutrient solution, This approach provides easy manipulation of the gaseous environment around the root

3.) The technique of growing plants with their roots immersed in nutrient solution without soil and requires a large

volume of nutrient solution or frequent adjustment of the nutrient solution to prevent nutrient uptake by roots from

producing radical changes in nutrient concentrations and pH of the medium.

Which of the following combination is correct ?