TLS Online TPP Program

#Question id: 757


_______________ a bacterial enzyme, uses the energy of ATP hydrolysis to introduce negative supercoiling into DNA hence removing positive supercoiling generated during replication.

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. nucleases

  2.  DNA polymerases

  3.  helicases

  4.  DNA gyrase

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TLS Online TPP Program

#Question id: 2581

#Unit 2. Cellular Organization

Match the following toxins (Column I) with their effects (Column II) on actin.

Column I

Column II

A. Cytochalasin D

i. Enhances nucleation by binding and stabilizing actin dimers and thereby lowering the critical concentration.

B. Latrunculin

ii. Binds at the interface between subunits in

F-actin, locking adjacent subunits together and preventing actin filaments from depolymerizing.

C. Jasplakinolide

iii. Depolymerizes actin filaments by binding to the (+) end of F-actin, where it blocks further addition of subunits.

D. Phalloidin

iv. Binds and sequesters G-actin, inhibiting it from adding to a filament end.

TLS Online TPP Program

#Question id: 24605

#Unit 2. Cellular Organization

Which of the following phenomenon will be affected most if exon – intron undergoes single base substitution

TLS Online TPP Program

#Question id: 15249

#Unit 2. Cellular Organization

Halophiles have adapted so completely to ____________ conditions that they require high levels of ___________ to grow.

TLS Online TPP Program

#Question id: 4735

#Unit 8. Inheritance Biology

In corn, three dominant alleles, called A, C, and R, must be present to produce colored seeds. Genotype A/–; C/– ; R/– is colored; all others are colorless. A colored plant AaCCRr is crossed with colorless plant aaCcRr. What proportional of offspring plant with colorless seed?

TLS Online TPP Program

#Question id: 4879

#Unit 8. Inheritance Biology

A wild plant with genes AABBCC was crossed with a triple recessive mutant aabbcc. The F1 male hybrid (AaBbCc) was then back crossed with the triple mutant and the phenotypes recorded are as follows

AabbCc (50), aaBbcc(50), AaBbCc (100), aabbcc (100), AaBbcc (350), aabbCc (350)

Distance between A to B is ----------M----- map unit with ………N…….configuration, distance between B to C is ----O---- map unit with ------P-------configuration?