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TLS Online TPP Program

#Question id: 10723

What does the graph tell you about the effect of a keystone species?

#Unit 10. Ecological Principles
  1. A keystone species has little interaction with other species in an environment.
  2. Removing a keystone species from the community drastically reduces species richness.
  3. Adding a keystone species to the community will make it more diverse.
  4. Removing a keystone species from the community will eventually allow for the invasion of a new species.
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TLS Online TPP Program

#Question id: 12178

#Unit 2. Cellular Organization

Following statements are regarding to V-class ATPases.
A. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of an equal number of anions (e.g., Cl−) in the same direction.
B. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of equal numbers of a different cation in the same direction.
C. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of equal numbers of a different cation in the opposite direction.
D. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of an equal number of anions (e.g., Cl−) in the opposite direction.
Which of the following combination is correct?
TLS Online TPP Program

#Question id: 34120

#Unit 2. Cellular Organization

The dynamic nature of DNA binding to the histone core structure is important, because many DNA-binding proteins strongly prefer to bind to histone-free DNA. Such proteins can recognize their binding site only when it is released from the histone octamer or is contained in linker or nucleosome-free DNA.

Which of the following statement stands untrue for above fact
TLS Online TPP Program

#Question id: 4862

#Unit 8. Inheritance Biology

In guinea pigs, white coat (w) is recessive to black coat (W) and wavy hair (v) is recessive to straight hair (V). A breeder crosses a guinea pig that is homozygous for white coat and wavy hair with a guinea pig that is black with straight hair. The F1 are then crossed with guinea pigs having white coats and wavy hair in a series of testcrosses. The following progeny are produced from these testcrosses:

black, straight  -   220             black, wavy  -30

white, straight  -30                   white, wavy- 220

If the genes are not assorting independently, what is the distance between coat color and hair shape governing gene
TLS Online TPP Program

#Question id: 1690

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is NOT TRUE of affinity?
TLS Online TPP Program

#Question id: 11471

#Unit 7. System Physiology – Animal

Hair cells in the vertebrate ear are responsible for transducing sound pressure waves. Ion channels in the hair cell membrane open when ________.