TLS Online TPP Program

#Question id: 4352


How does extracellular glucose inhibit transcription of the lac operon?

#Section 3: Genetics, Cellular and Molecular Biology
  1. by strengthening the binding of the repressor to the operator

  2. by weakening the binding of the repressor to the operator

  3. by inhibiting RNA polymerase from opening the strands of DNA to initiate transcription

  4. by reducing the levels of intracellular cAMP

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TLS Online TPP Program

#Question id: 3045

#Section 2: General Biology

Which one of the following combinations Mac-Conkey Agar allows to growth of gram negative bacteria?

(P) Bile salts                          (Q) Sodium chloride

(R) Methylene blue                  (S) Crystal violet

TLS Online TPP Program

#Question id: 3216

#Section 3: Genetics, Cellular and Molecular Biology

The frequency of galactosemia is approximately 1 in 40,000 live births. The frequency of the carrier state can be calculated as

TLS Online TPP Program

#Question id: 3250

#Section 3: Genetics, Cellular and Molecular Biology

Consider a diploid population at Hardy-Weinberg equilibrium. For a locus with two alleles, the frequency of the A1A1, A1A2 and A2A2 genotype is 0.01, 0.18 and 0.81) Which of the following statement is correct?

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#Question id: 3251

#Section 3: Genetics, Cellular and Molecular Biology

Looking at 3 allele per locus and following Hardy Weinberg equilibrium what will be the expected heterozygosity if q1=0.5, q2=0.3, q3=0.2

TLS Online TPP Program

#Question id: 3252

#Section 3: Genetics, Cellular and Molecular Biology

 The unaffected brother of a cystic fibrosis affected girl is referred for genetic counseling. Assume that the population is in Hardy-Weinberg equilibrium. Which of the following is correct?  (Cystic fibrosis is an autosomes recessive inheritance with an incidence of 1 in 2500).

TLS Online TPP Program

#Question id: 3253

#Section 3: Genetics, Cellular and Molecular Biology

In a population 64% individuals of 1000 population are affected with autosomes dominant diseased. How many individuals are expected carry at least one dominant allele?