Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 709
TLS Online TPP Program

#Question id: 727

26-residue peptide composed of alanine and leucine shows a circular dichroism (CD) spectrum characteristic of α-helix at 50°C in 5 mM phosphate buffer at pH 7.4. When the peptide solution is cooled gradually to 25°C, and the CD spectra are recorded at different temperatures, the most likely observation will be that

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Spectra will be convoluted and helical content will increase

  2. Spectra will be deconvoluted and helical content will decrease

  3. Spectra will be deconvoluted and helical content will increase

  4. Spectra will be deconvoluted and random coil content will increase

More Questions
TLS Online TPP Program

#Question id: 19816

#Unit 12. Applied Biology

Antisense RNA, in its simplest form, can be produced by _____with respect to the promoter in an expression 
TLS Online TPP Program

#Question id: 19108

#Unit 8. Inheritance Biology

Assume that mating is random. Colorblindness is an X-linked recessive trait that is found in about 5 percent of males. What fraction of females are heterozygous carriers of the colorblindness allele?
TLS Online TPP Program

#Question id: 3853

#Unit 3. Fundamental Processes

In E. coli, promoter sequences are located at which of the following position(s) on the template strand?
TLS Online TPP Program

#Question id: 5647

#Unit 5. Developmental Biology

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein

that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1) from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. Treatments:

A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads

B: S. purpuratus sperm mixed with beads containing no ERB1 protein

C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads

D: S. franciscanus sperm mixed with beads containing no ERB1 protein

Based on the data in the graph, which of the following conclusions is supported?
TLS Online TPP Program

#Question id: 7247

#Unit 5. Developmental Biology

Which statement correctly characterizes regeneration in the mammalian nervous system?