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TLS Online TPP Program

#Question id: 7278

The following demonstrates the blastocoel formation in the mammals. Which of the following statement is correct?

#Unit 5. Developmental Biology
  1. The membranes of inner cell mass contain sodium pumps that pump Na+ into the central cavity. The subsequent accumulation of Na+ draws in water osmotically, creating and enlarging the blastocoel.
  2. The membranes of trophoblast cells contain sodium pumps  that pump Na+ into the central cavity. The subsequent accumulation of Na+ draws in water osmotically, creating and enlarging the blastocoel.
  3. The membranes of inner cell mass contain potassium pumps that pump K+ into the central cavity. The subsequent accumulation of K+ draws in water osmotically, creating and enlarging the blastocoel.

  4. The membranes of trophoblast cells contain potassium pumps that pump K+ into the central cavity. The subsequent accumulation of K+ draws in water osmotically, creating and enlarging the blastocoel.

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TLS Online TPP Program

#Question id: 12579

#Unit 10. Ecological Principles

Which of the following probably contains the highest concentration of toxic pollutants (biological magnification)? 
TLS Online TPP Program

#Question id: 1566

#Unit 4. Cell Communication and Cell Signaling

Histamines trigger dilation of nearby blood vessels, and increase in their permeability. Which of the signs of inflammation are therefore associated with histamine release?
TLS Online TPP Program

#Question id: 11989

#Unit 10. Ecological Principles

If mayflies lay eggs on roads instead of in water, this behavior could involve which of the following? 
TLS Online TPP Program

#Question id: 23683

#Unit 13. Methods in Biology

What is the enzymatic function of restriction enzymes?
TLS Online TPP Program

#Question id: 5272

#Unit 8. Inheritance Biology

Clever technique that streamlines the identification of auxotrophic mutants is