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TLS Online TPP Program

#Question id: 692

 In the alpha helix the hydrogen bonds:

#XL - Q Biochemistry

  1. are roughly parallel to the axis of the helix.

  2. are roughly perpendicular to the axis of the helix.

  3. occur mainly between electronegative atoms of the R groups.

  4. occur only between some of the amino acids of the helix.

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TLS Online TPP Program

#Question id: 10272

#XL - T Zoology

Specific place on a chromosome occupied by an allele
TLS Online TPP Program

#Question id: 19666

#XL - P Chemistry

The Lucas test was carried out on three different compounds: A, B, and C. Compounds A and B were turbid at ambient temperature, while compound C did not become turbid until it was heated. Which one of the compounds is tertiary in structure?
TLS Online TPP Program

#Question id: 2148

#XL - S Microbiology

The specificity of the potassium channel for K+ over Na+ is mainly the result of the:
TLS Online TPP Program

#Question id: 2091

#XL - S Microbiology

Proteins can be attached to the phospholipid bilayer plasma membrane by covalently linked hydrocarbon groups. Which of the following mechanisms are not employed in this anchoring?
TLS Online TPP Program

#Question id: 2181

#XL - S Microbiology

What is the expected effect on salt accumulation in the plant vacuole of a mutation in the plant vacuolar ATPase that decreases the H+ concentration in the vacuole?