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TLS Online TPP Program

#Question id: 24263

Choose the incorrect option

#Unit 2. Cellular Organization

  1. The two H2A.H2B dimers each associate with 30 bp of DNA on either side of the central 60 bp of DNA bound by H3 and H4.

  2. Using the clock analogy again, the DNA associated with H2A.H2B is located from 5 o’clock to 9 o’clock on either face of the nucleosome disc.
  3. Together, the two H2A.H2B dimers form the upper part of the histone octamer located across the disc from the DNA ends
  4. Each nucleosome added to a covalently closed circular template changes the linking number of the associated DNA by approximately –1.2.
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TLS Online TPP Program

#Question id: 13020

#Unit 10. Ecological Principles

Experts in deer ecology generally agree that population sizes of deer that live in temperate climates are limited by winter snow. The deer congregate in ?yarding? areas under evergreen trees because venturing out to feed in winter is energetically too expensive when snowfall depths accumulate to above 40 cm. Deer often stay yarded until the spring thaw. Snow depth over 40 inches for more than 60 days results in high mortality due to starvation.  This observation best illustrates which of the following principles about factors that limit distribution of organisms?
TLS Online TPP Program

#Question id: 13021

#Unit 10. Ecological Principles

Which marine zone would have the lowest rates of primary productivity (photosynthesis)? 
TLS Online TPP Program

#Question id: 13022

#Unit 10. Ecological Principles

A certain species of pine tree survives only in scattered locations at elevations above 2,800 m in the western United States. To understand why this tree grows only in these specific places an ecologist should
TLS Online TPP Program

#Question id: 13023

#Unit 13. Methods in Biology

Which of the following enzymes are required for end labelling?
TLS Online TPP Program

#Question id: 13024

#Unit 13. Methods in Biology

Inset and the vector can be ligated if they are digested by a pair of –
TLS Online TPP Program

#Question id: 13025

#Unit 13. Methods in Biology

Which enzyme is used for homopolymer tailing?