TLS Online TPP Program

#Question id: 1118


What are scaffolding proteins?

#Section 3: Genetics, Cellular and Molecular Biology
  1. microtubule arrays that allow lipid-soluble hormones to get from the cell membrane to the nuclear pores

  2. large molecules to which several relay proteins attach to facilitate cascade effects

  3. relay proteins that orient receptors and their ligands in appropriate directions to facilitate complex formation

  4. proteins that enter the nucleus of a cell to regulate transcription

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TLS Online TPP Program

#Question id: 3784

#Section 3: Genetics, Cellular and Molecular Biology

In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules?

TLS Online TPP Program

#Question id: 3785

#Section 3: Genetics, Cellular and Molecular Biology

The elongation of the leading strand during DNA synthesis

TLS Online TPP Program

#Question id: 3786

#Section 3: Genetics, Cellular and Molecular Biology

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

TLS Online TPP Program

#Question id: 3787

#Section 3: Genetics, Cellular and Molecular Biology

A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?

TLS Online TPP Program

#Question id: 3788

#Section 3: Genetics, Cellular and Molecular Biology

The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage?

TLS Online TPP Program

#Question id: 3790

#Section 3: Genetics, Cellular and Molecular Biology

Semiconservative replication of DNA means that: