Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 660
TLS Online TPP Program

#Question id: 678

Which is not true about β-sheets?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. The side-chains of all amino acids point to the same side of the sheet.

  2. The polypeptide chains in the sheet are nearly fully extended.

  3. The range of allowed phi and psi angles is broader than for those in the α-helix.

  4. In antiparallel sheets the hydrogen bonds between adjacent strands are nearly perpendicular to the backbones of the strands.

More Questions
TLS Online TPP Program

#Question id: 28216

#Unit 5. Developmental Biology

The cell retain stem cell niche and maintained their proliferative properties is referred to as___
TLS Online TPP Program

#Question id: 1339

#Unit 4. Cell Communication and Cell Signaling

Which of the following cellular structures serve similar functions in plants and animals, respectively?

Plants                    Animals 
TLS Online TPP Program

#Question id: 16130

#Unit 13. Methods in Biology

You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.              
How many units of ß-galactiosidase would you expect to be expressed from deletion 1 in a gln2– mutant? 
TLS Online TPP Program

#Question id: 4330

#Unit 3. Fundamental Processes

Proto-oncogenes can change into oncogenes that cause cancer. Which of the following best explains the presence of these potential time bombs in eukaryotic cells?
TLS Online TPP Program

#Question id: 33490

#Unit 2. Cellular Organization

Which of the following techniques are not appropriately used to characterize genome 
A. RFLP
B. DNA Microarray
C. Southern Blotting
D. FISH