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TLS Online TPP Program

#Question id: 7150

What is the role of semaphorins and Eph ligands in development of the nervous system?

#Unit 5. Developmental Biology
  1. The semaphorins and Eph ligands are growth factors that stimulate cell division of neurons.
  2. The semaphorins and Eph ligands act as signals for the outgrowth of neuronal growth cones; in general, both lead growth cones to turn away.
  3. The semaphorins and Eph ligands act as signals for the outgrowth of neuronal growth cones; in general, both lead growth cones to come toward them.
  4. The semaphorins and Eph ligands are cell-cell adhesion molecules that bind adjacent neurons together.
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TLS Online TPP Program

#Question id: 16781

#Unit 13. Methods in Biology

At Dunkin Donuts the number of donut holes in a bag can vary. Help Donald find the mode. 12,10,10,10,13,12,11,13,10
TLS Online TPP Program

#Question id: 27079

#Unit 1. Molecules and their Interaction Relevant to Biology

The van der Waals interaction as a function of interatomic distance r, then which of the following equation is correct 
TLS Online TPP Program

#Question id: 24465

#Unit 3. Fundamental Processes

Which of the following is incorrectly matched  
TLS Online TPP Program

#Question id: 4449

#Unit 3. Fundamental Processes

Promoters recognized by polymerase containing s70 share the following characteristic structure;
TLS Online TPP Program

#Question id: 3607

#Unit 8. Inheritance Biology

Cystic fibrosis is caused by a recessive lethal gene and can be detected by an excess concentration of chloride in sweat. If a sweat test reveals a man to be heterozygous and his wife to be homozygous normal, what are the chances that their children will have the disease?