TLS Online TPP Program

#Question id: 2526


cell walls essential and are important features of plant cells that perform a number of essential functions. Which of the following is not the characteristics of cell wall?

#Unit 2. Cellular Organization
  1. Cells are glued together by their walls, preventing cell sliding, slippage, and motility

  2. The cell wall acts as a cellular “exoskeleton” that controls cell shape and allows high turgor pressures to develop

  3. cell wall acts as a diffusion barrier that exceeds the size and kinds of molecules that can reach the plasma membrane, both through sieving effects and through ionic and covalent interactions

  4. sensory proteins are partly anchored in the cell wall and form a bridge to the plasma membrane

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TLS Online TPP Program

#Question id: 5802

#Unit 8. Inheritance Biology

A wild type allele:

TLS Online TPP Program

#Question id: 5803

#Unit 8. Inheritance Biology

The mutation which causes sickle cell anemia in humans:

TLS Online TPP Program

#Question id: 5804

#Unit 8. Inheritance Biology

The gene that is mutated in cases of cystic fibrosis encodes an ion transporter protein normally expressed in the respiratory and digestive tracts along with other locations. Individuals homozygous for the most common mutation in this gene (ΔF508) died at very early ages prior to the advent of advanced medical intervention. Despite this, the mutation exists at relatively high frequency in populations of European descent. One potential explanation is that heterozygotes for such mutations may be relatively immune to the lethal effects of diseases such as typhoid fever. Which statement below is most accurate?

TLS Online TPP Program

#Question id: 5805

#Unit 8. Inheritance Biology

In Himalayan rabbits, the ears, feet, and muzzle are pigmented while the rest of the body is white. This is because they express an enzyme variant that is ineffective at body temperature but functions at the lower temperatures experienced by cells of the extremities. This is an example of:

TLS Online TPP Program

#Question id: 5806

#Unit 8. Inheritance Biology

Which of these is NOT a mechanism by which a chromosome rearrangement could affect gene function?

TLS Online TPP Program

#Question id: 5807

#Unit 8. Inheritance Biology

Which of the following would be an example of a germline mutation?