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TLS Online TPP Program

#Question id: 27249

DNA tertiary structure, what is a histone octamer?

#XL - T Zoology

  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: 32929

#XL - S Microbiology

Which of the following is the first activated intermediate in the bacterial sulfur assimilation pathway?
TLS Online TPP Program

#Question id: 4620

#XL - T Zoology

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?
TLS Online TPP Program

#Question id: 19945

#XL - P Chemistry

The two electrons have the following sets of quantum numbers . X: 3, 2, -2, + ½ Y : 3, 0, 0, + ½. What is true of the following?
TLS Online TPP Program

#Question id: 3686

#XL - S Microbiology

The short strand of ........ primer is required for the replication of DNA:
TLS Online TPP Program

#Question id: 4932

#XL - T Zoology

Which of the following is the best hypothesis regarding origins of nucleic acids?