TLS Online TPP Program

#Question id: 11213


An example of ligand-gated ion channels is ________.

#Unit 7. System Physiology – Animal
  1. the spreading of action potentials in the heart
  2. acetylcholine receptors at the neuromuscular junction
  3. cAMP-dependent protein kinases
  4. action potentials on the axon
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TLS Online TPP Program

#Question id: 5349

#Unit 8. Inheritance Biology

The following is the inheritance pattern of a trait under observation:

(i) The trait often follow cris cross inheritance 

(iii) Unaffected father born to affected daughter

The trait is likely to be

TLS Online TPP Program

#Question id: 5348

#Unit 8. Inheritance Biology

Miniature wings (Xm) in Drosophila result from an X-linked allele that is recessive to the allele for long wings (XL). Following different cross with resulting progeny were possible

Male parent

Female parent

Heterozygous

Male offspring

Female offspring

Long wings

XLY

Long wing

XL Xm

       A

B

Miniature wings

XmY

Long wing

XL Xm

C

D

Which of the following above offspring is not possible to carry miniature wings?

TLS Online TPP Program

#Question id: 5239

#Unit 8. Inheritance Biology

Which of the following statements is not true for Hfr strains of E. coli ?

TLS Online TPP Program

#Question id: 5240

#Unit 8. Inheritance Biology

If bacteria grow in the presence of a large amount of DNase, which of the following recombination process completely inhibited?

TLS Online TPP Program

#Question id: 5241

#Unit 8. Inheritance Biology

Genes a, b, and c are widely spaced in the bacterial genome. Transducing phage from an a+ b+ c+ bacterium were used to infect a culture of a- b- c- cells, and b+ transductants were selected. Which of the following best describes the predicted genotypes of these transductants?

TLS Online TPP Program

#Question id: 5242

#Unit 8. Inheritance Biology

Auxotrohic bacteria plating on different medium, it is observed that colonies grow on minimal plus threonine only, no colony on minimal plus leucine and no colonies grow on minimal medium cystein only. What are the actual genotypes of auxotroph?