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#Question id: 12057


A tsunami tidal wave hits the east coast of South America and the people living there are forced to drink unclean water. Within the next several days, a large number of people develop severe diarrhea and about half of these people expire. Samples of drinking water are positive for Vibrio cholerae. Which of the following types of ion channels is most likely to be irreversibly opened in the epithelial cells of the crypts of Lieberkühn in these people with severe diarrhea?

#Unit 7. System Physiology – Animal
  1. Calcium channels
  2. Chloride channels
  3. Magnesium channels
  4. Potassium channels
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TLS Online TPP Program

#Question id: 4026

#Unit 3. Fundamental Processes

The human genome encodes transcription factors that contain an acidic activation domain that is phosphorylated in response to increased levels of the second messenger cAMP. Which one of the following contains one of these activation domains?

TLS Online TPP Program

#Question id: 4882

#Unit 8. Inheritance Biology

In Drosophila melanogaster, cinnabar eye (cn)and vestigial wing (vg) are simple recessive traits.a A male pure line wild type eye ,vestigial wing cross with female pure line cinnabar eye, wild type wing . F1female, heterozygous for both genes, was crossed with a male with cinnabar eyes and vestigial wings. The offspring resulting from this cross are listed in below class

I Wild type

II Cinnabar eye, wild-type wing

III Wild-type eye, vestigial wing

IV Cinnabar eye, vestigial wing

Above class are recombinant progeny

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#Question id: 611

#Unit 1. Molecules and their Interaction Relevant to Biology

Which statement is false about the sequential theory of enzyme catalysis?

TLS Online TPP Program

#Question id: 15480

#Unit 12. Applied Biology

Feedback repression involves the turning “off” of enzyme synthesis when the amount of the product has been made in sufficient quantities. The end product of the pathway acts as

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.