Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 53107
TLS Online TPP Program

#Question id: 28054

During the unfolding of a helix, breakage of each hydrogen bond requires about 2 kJ/mol. This implies: 

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. hydrogen bonds are not reformed with water
  2. hydrogen bonds are too much weaker in proteins than in water
  3. hydrogen bonds are slightly stronger in proteins than in water
  4. hydrogen bonds are slightly weaker in proteins than in water
More Questions
TLS Online TPP Program

#Question id: 1495

#Unit 4. Cell Communication and Cell Signaling

In some breast cancers, estrogen acts as a(n):
TLS Online TPP Program

#Question id: 11735

#Unit 6. System Physiology – Plant

In cytokinin biosynthesis is the addition of the isopentenyl side chain from DMAPP to an adenosine moiety. The plant and bacterial IPT enzymes differ substrate used;

a) the bacterial enzyme utilizes AMP

b) the plant enzyme appears to utilize AMP

c) the bacterial enzyme utilizes both ADP and ATP

d) the plant enzyme appears to utilize both ADP and ATP
TLS Online TPP Program

#Question id: 23145

#Unit 13. Methods in Biology

A chemical is said to be fluorescent if it absorbs light at one wavelength (excitation) and emits light (fluoresces) at a specific 
TLS Online TPP Program

#Question id: 11281

#Unit 10. Ecological Principles

Owls eat rats, mice, shrews, and small birds. Assume that, over a period of time, an owl consumes 5,000 J of animal material. The owl loses 2,300 J in feces and owl pellets and uses 2,500 J for cellular respiration. What is the production efficiency of this owl?
TLS Online TPP Program

#Question id: 2498

#Unit 2. Cellular Organization

Kinetochores assemble at the: