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TLS Online TPP Program

#Question id: 1077

Would ID50 and LD50 necessarily be the same for a given virus? Why or why not?

#XL - T Zoology

  1. Yes, because the number of viruses that infect 50% of a test population should also kill 50% of that test population.

  2. No, because a virus may be highly infectious (very low ID50 value) but only marginally lethal (very high LD50 value). A prime example of this is the rhinovirus (common cold virus).

  3. No, because very few viruses are lethal, yet many are highly infectious. The two values should ALWAYS be different.

  4. Yes, because what we're actually describing here is infection/killing of individual CELLS, not of entire organisms. If a cell is infected, it will always be killed.

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TLS Online TPP Program

#Question id: 657

#XL - Q Biochemistry

Structural proteins that typically assemble into large cables or threads to provide mechanical support to cells or organisms are classified as ________ proteins.
TLS Online TPP Program

#Question id: 658

#XL - Q Biochemistry

To what level of structure do α-helices belong?
TLS Online TPP Program

#Question id: 659

#XL - Q Biochemistry

What does it mean to say a protein is oligomeric?
TLS Online TPP Program

#Question id: 660

#XL - Q Biochemistry

Computers are used to advance the understanding of three dimensional protein structure by
TLS Online TPP Program

#Question id: 661

#XL - Q Biochemistry

Which technique is commonly used to determine the three-dimensional conformation of a protein?
TLS Online TPP Program

#Question id: 662

#XL - Q Biochemistry

________ received a Nobel Prize in 1964 for determining the structure of vitamin B12. He/she also solved the structure of penicillin in 1947 and developed many techniques used in the study of large proteins.