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TLS Online TPP Program

#Question id: 11483

Experiments with genetically altered mice showed that the mice would consume abnormally high amounts of bitter-tasting compounds in water after their ________.

#Unit 7. System Physiology – Animal
  1. hormone receptors for digestive hormones were reduced or eliminated, showing that bitter tastes are reinforced by digestive responses
  2. salt-taste cells were altered to express receptors for bitter tastants, suggesting that animals have unregulated salt appetites
  3. visual sense was reduced or eliminated, suggesting that mice learn visual cues about bitter tastes
  4. sweet-taste cells were altered to express receptors for bitter tastants, suggesting that the sensation of taste depends only on which taste cell is stimulated
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TLS Online TPP Program

#Question id: 15679

#Unit 2. Cellular Organization

Dry heat sterilization the items to be sterilized are placed in an oven at 
TLS Online TPP Program

#Question id: 13183

#Unit 10. Ecological Principles

The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.


According to the MacArthur-Wilson model, how would the number of bird species change from the time of an island's formation (assuming it remains constant in size and isolation)?
TLS Online TPP Program

#Question id: 3400

#Unit 11. Evolution and Behavior

Which of the following influence effective population size?

a. Sex ratio

b. variation between individuals in reproductive success

c. Fluctuations in population size

d. Small breeding group
TLS Online TPP Program

#Question id: 5679

#Unit 5. Developmental Biology

Following statements regarding to the molecular processes of capacitation.

A. The sperm cell membrane is altered by the removal of albumin by cholesterol in the female reproductive tract.

B. Particular proteins or carbohydrates on the sperm surface are lost during decapacitation.

C. The membrane potential of the sperm cell becomes more positive as potassium ions leave the sperm. This change in membrane potential may allow calcium channels to be opened and permit calcium to enter the sperm.

D. Calcium and bicarbonate ions are critical in activating cAMP production and in facilitating the membrane fusion events of the acrosome reaction.

E. As a result of cAMP formation, protein phosphorylation occurs. Once they are phosphorylated, some proteins migrate to the surface of the sperm head. One of these proteins is izumo, which is critical in sperm-egg fusion.

which one of the following combinations is correct?
TLS Online TPP Program

#Question id: 12750

#Unit 13. Methods in Biology

Bacterial culture was treated with SDS and NAOH then centrifuged, supernatant was decanted and treated with potassium acetate and centrifuged to get a pellet. What is the composition of the pellet?