TLS Online TPP Program

#Question id: 2684


In DNA tertiary structure, what is a histone octamer?

#Unit 2. Cellular Organization
  1. A complex consisting of eight positively charged histone proteins (two of each H2A, H2B, H3 and H4) that aid in the packaging of DNA

  2. A complex consisting of eight negatively charged histone proteins (two of each H2A, H2B, H3 and H4) that aid in the packaging of DNA

  3. A complex consisting of nine positively charged histone proteins (H1 and two of each H2A, H2B, H3 and H4) that aid in the packaging of DNA.

  4. A complex consisting of nine negatively charged histone proteins (H1 and two of each H2A, H2B, H3 and H4) that aid in the packaging of DNA.

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TLS Online TPP Program

#Question id: 610

#Unit 1. Structure and Function of Biomolecules

Protein A has four identical subunits, each of which binds one molecule of ligand Y. The binding of one molecule of Y to one of the subunits induces a conformational change in neighboring subunits that enhances the binding of additional units of Y. This is an example of________.

TLS Online TPP Program

#Question id: 611

#Unit 1. Structure and Function of Biomolecules

Which statement is false about the sequential theory of enzyme catalysis?

TLS Online TPP Program

#Question id: 612

#Unit 1. Structure and Function of Biomolecules

 The quaternary structure of hemoglobin changes from the T state to the R state ________.

TLS Online TPP Program

#Question id: 613

#Unit 1. Structure and Function of Biomolecules

Ethanol (CH3CH2OH) is the alcohol found in beverages. It is oxidized in the body to acetaldehyde by the enzyme alcohol dehydrogenase. Methanol (CH3OH), also known as wood alcohol, is converted to formaldehyde by the same enzyme. Acetaldehyde is toxic, but formaldehyde is far more toxic to humans, which is why the ingestion of relatively small amounts of methanol can cause blindness or death. One treatment for mild methanol poisoning is the administration of ethanol. Why might a doctor choose this treatment?

TLS Online TPP Program

#Question id: 614

#Unit 1. Structure and Function of Biomolecules

What type of inhibition is indicated by the data graphed below?

TLS Online TPP Program

#Question id: 615

#Unit 1. Structure and Function of Biomolecules

The following data were obtained in the presence and absence of inhibitor. What type of inhibition is shown?