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TLS Online TPP Program

#Question id: 20311

Which of the following is INCORRECT about Aldosterone;

#Unit 7. System Physiology – Animal
  1. Aldosterone exerts nearly 90 percent of the mineralocorticoid activity of the adrenocortical secretions, but cortisol, the major glucocorticoid secreted by the adrenal cortex.
  2. Aldosterone’s mineralocorticoid activity is about 3000 times greater than that of cortisol, but the plasma concentration of cortisol is nearly 2000 times that of aldosterone.
  3. Aldosterone increases reabsorption of potassium and simultaneously increases secretion of sodium by the renal tubular epithelial cells, especially in the principal cells of the collecting tubule
  4. A high concentration of aldosterone in the plasma can transiently decrease the sodium loss into the urine to as little as a few milliequivalents a day
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TLS Online TPP Program

#Question id: 3377

#Unit 11. Evolution and Behavior

To call a behavior altruistic, an evolutionary biologist will have to demonstrate that

A) These behavior is decrease the individual fitness of the donor and increases the individual fitness of the recipient

B) These behavior is increases the individual fitness of both the donor and the recipient

C) Overall increase the inclusive fitness of the population

D) These behavior depend on genetic relation

Which of the following above statement is correct?
TLS Online TPP Program

#Question id: 3279

#Unit 11. Evolution and Behavior

Which two of the following have operated to increase divergence between mosquito fish populations on island?

a. improved gene flow

b. bottleneck effect

c. sexual selection

d. founder effect

e. natural selection
TLS Online TPP Program

#Question id: 3430

#Unit 11. Evolution and Behavior

The proximate causes of behavior are interactions with the environment, but behavior is ultimately shaped by
TLS Online TPP Program

#Question id: 33398

#Unit 1. Molecules and their Interaction Relevant to Biology

Immunoglobulin fold is characterised by
TLS Online TPP Program

#Question id: 4742

#Unit 8. Inheritance Biology

In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?