TLS Online TPP Program

#Question id: 3989


Which one of the following statements about the transcription attenuation mechanism is true?

#Unit 3. Fundamental Processes
  1.  In some operons (e.g., the his operon), attenuation may be the only regulatory mechanism.

  2. Sequences of the trp operon leader RNA resemble an operator.

  3. The leader peptide acts by a mechanism that is similar to that of a repressor protein.

  4. The leader peptide gene of the trp operon includes no Trp codons.

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TLS Online TPP Program

#Question id: 3642

#Unit 3. Fundamental Processes

Any piece of DNA which replicates as a single unit is called

TLS Online TPP Program

#Question id: 4930

#Unit 11. Evolution and Behavior

Which of the following is the correct sequence of events in the origin of life?

I. Formation of protocells

II. Synthesis of organic monomers

III. Synthesis of organic polymers

IV. Formation of DNA-based genetic systems

TLS Online TPP Program

#Question id: 3000

#Unit 2. Cellular Organization

Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, whichstatement concerning mycoplasmas should be true?

TLS Online TPP Program

#Question id: 15266

#Unit 13. Methods in Biology

In DNA isolation, which of the following enzyme remove/digest proteins in presence of SDS or chelating agent

TLS Online TPP Program

#Question id: 11724

#Unit 6. System Physiology – Plant

At the subcellular level, starch is stored in amyloplasts in the endosperm of cereals. Two enzymes responsible for initiating starch degradation are α- and β-amylase

a) α-Amylase hydrolyzes starch chains internally to produce oligosaccharides consisting of α(1,4)-linked glucose residues

b) β-Amylase degrades these oligosaccharides from the ends to produce maltose, a disaccharide

c) α-Amylase degrades these oligosaccharides from the ends to produce maltose, a disaccharide

d)  α-Amylase hydrolyzes starch chains internally to produce oligosaccharides consisting of  β(1,4)-linked glucose residues

e) β-Amylase also converts maltose to glucose

Which of the following combination from the above statements is correct?