TLS Online TPP Program

#Question id: 12928


Name the enzyme which is used to stabilize bases.

#Unit 13. Methods in Biology
  1. DNA helicase
  2. DNA primase
  3. DNA ligase
  4. DNA clamp
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TLS Online TPP Program

#Question id: 2537

#Unit 2. Cellular Organization

Which of the following is the smallest structure that would most likely be visible with a standard (not super-resolution) research-grade light microscope?

TLS Online TPP Program

#Question id: 1387

#Unit 4. Cell Communication and Cell Signaling

The ability of a population of fibroblasts to migrate along the surface of a tissue culture dish depends on adhesion between the cell surface and the extracellular matrix molecules coating the dish. The dish is coated with laminin, and the only cell-surface protein capable of binding laminin is a cell-adhesion protein called an integrin. Integrins are integral plasma-membrane proteins that function as heterodimers. Under these conditions the rate at which a fibroblast can migrate along the laminin coated culture dish is proportional to the strength of adhesion between the cell and the laminin substrate. The table below lists the rate of cell migration observed for fibroblasts genetically engineered to generate the indicated phenotypes. Microinjection into the cytoplasm of a wild. type cell of a solution of a synthetic peptide possessing the same sequence as the integrin beta subunit cytoplasmic domain would be expected to yield an average fibroblast-cell migration rat

Fibroblast Phenotype

Level of Integrin Heterodimer at the Cell Surface (percent of wild type)

Rate of Cell Migration (pm/min) 

1. Wild type

100

2

2. Overexpression of the wild-type integrin alpha subunit

104

2

3. Overexpression of an integrin beta subunit lacking the cytoplasmic domain

96

0.6

4. Overexpression of the soluble cytoplasmic domain of an integrin beta subunit

98

0.6

5. Absence of the integrin alpha subunit

Less than 1

0.05

TLS Online TPP Program

#Question id: 27416

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statement is true
1. Wedge or cone shape lipid promote the formation of monolayer micelle 
2. Wedge or cone shape lipid promote the formation of lipid bilayer 
3. Cylindrical shaped lipid majorly promote the formation of perfect  lipid bilayer region
4. Cylindrical shaped lipid majorly promote the formation of monolayer micelle

TLS Online TPP Program

#Question id: 24476

#Unit 3. Fundamental Processes

Which of the following is correctly representing the position of  TATA box 

TLS Online TPP Program

#Question id: 7265

#Unit 5. Developmental Biology

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?