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TLS Online TPP Program

#Question id: 5772

A missense mutation in Neurospora will revert by treatment with nitrous acid (causes transversions), but not by hydroxylamine (causes AT -> GC transitions). The original mutation (not the reversion) must have been

#Unit 8. Inheritance Biology

  1. AT to GC

  2. AT to TA

  3. AT to CG

  4. GC to AT

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TLS Online TPP Program

#Question id: 4469

#Unit 3. Fundamental Processes

Termination is a normal and important function at the ends of genes. There, sequences called terminators trigger the elongating polymerase to dissociate from the DNA and release the RNA chain it has made, In bacteria, terminators come in two types: Rho-dependent and Rho-independent, choose correct statements about this;

Rho-dependent

a- rut sites

b- has an ATPase activity

Rho-independent

c- terminates only those transcripts still being transcribed beyond the end of a gene or operon

d- intrinsic terminator

TLS Online TPP Program

#Question id: 14906

#Unit 6. System Physiology – Plant

The specific linkages between sugar rings, including the specific carbons that are linked together and the configuration of the linkage, are important for the properties of the polysaccharide;
           
          I) Amylose                          a) β(1,3)-linkages                               
        II) Cellulose                          b) β (1,4)-linkages
         III) Callose                                   c) α(1,4)-linked
                                                             d) α (1,3)-linkages
Which of the following linkage combinations is correct linkages of the polysaccharides?
TLS Online TPP Program

#Question id: 23141

#Unit 13. Methods in Biology

Resolution of a light microscope is 0.42nm at 300 wavelength of light. If the specimen is viewed under oil what is the refractive index?
TLS Online TPP Program

#Question id: 7202

#Unit 5. Developmental Biology

Identify the correct match of the modes of regeneration (column I) with their definition (column II)

Column I

Column II

A. Stem cell-mediated regeneration

i. Through the re-patterning of existing tissues. There is often little new growth but rather cell death and a change in cell type (i.e., transdifferentiation into a different cell fate). This results in a rescaling of the whole organism as well as regeneration of the missing part.

B. Epimorphosis

ii. The differentiated cells divide but maintain their differentiated functions. The new cells do not come from stem cells, nor do they come from the dedifferentiation of adult cells.

C. Morphallaxis

iii. Adult structures can undergo dedifferentiation to form a relatively undifferentiated mass of cells (a blastema) that then redifferentiates during morphogenesis of the new

structure.

D. Compensatory regeneration

iv. Stem cells allow an organism to regrow certain organs or tissues that have been lost.

 
TLS Online TPP Program

#Question id: 404

#Unit 1. Molecules and their Interaction Relevant to Biology

When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25 °C with phosphoglycerate mutase until equilibrium is reached, the final mixture contains six times as much 2-phosphoglycerate as 3-phosphoglycerate.  Which one of the following statements is most nearly correct, when applied to the reaction as written?  (R = 8.315 J/mol·K; T = 298 K)  3-Phosphoglycerate -> 2-phosphoglycerate