TLS Online TPP Program

#Question id: 4132


In E. coli, aminoacyl-tRNA synthetases:

#Section 3: Genetics, Cellular and Molecular Biology
  1. activate amino acids in 12 steps

  2. are amino acid–specific; there is at least one enzyme specific for each amino acid.

  3. fall into two classes, each of which attaches amino acids to different ends of the tRNA.

  4. have no proofreading activities.

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#Question id: 3698

#Section 3: Genetics, Cellular and Molecular Biology

In this diagram of the process of DNA replication at a replication fork, the strand labeled B is the:

TLS Online TPP Program

#Question id: 3699

#Section 3: Genetics, Cellular and Molecular Biology

In this diagram of the process of DNA replication at a replication fork, the black boxes labeled D and E are:

TLS Online TPP Program

#Question id: 3700

#Section 3: Genetics, Cellular and Molecular Biology

In the Meselson-Stahl DNA replication experiment, if the cells were first grown for many generations in 15N containing media, and then switched to 14N containing media, what percent of the DNA had 1 light strand and 1 heavy strand after 2 generations of growth in 15N growth media?

TLS Online TPP Program

#Question id: 3701

#Section 3: Genetics, Cellular and Molecular Biology

Frederick Griffith accidentally discovered transformation when attempting to develop a vaccine for pneumonia. He injected mice with samples from S-strain (virulent) and/or R-strain (nonvirulent) pneumococci bacteria (Streptococcus pneumoniae). Which of the following results is NOT consistent with Griffith's experiments?

TLS Online TPP Program

#Question id: 3702

#Section 3: Genetics, Cellular and Molecular Biology

For the DNA strand 5'-TACGATCATAT-3' the correct complementary DNA strand is:

TLS Online TPP Program

#Question id: 3706

#Section 3: Genetics, Cellular and Molecular Biology

During the elongation stage of DNA replication