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TLS Online TPP Program

#Question id: 9159

Which of the following investigations would shed the most light on the future distribution of organisms in temperate regions that are faced with climate change?

#Unit 9. Diversity of Life Forms

  1. Remove, to the mineral soil, all of the organisms from an experimental plot, and monitor the colonization of the area over time in terms of both species diversity and abundance.

  2. Look at the climatic changes that occurred since the last ice age and how species redistributed as glaciers melted, then make predictions on future distribution in species based on past trends.

  3. Compare and contrast the flora and fauna of warm/cold/dry/wet climates to shed light on how they evolved to be suited to their present-day environment.

  4. Quantify the impact of man's activities on present-day populations of threatened and endangered species to assess the rate of extirpation and extinction.
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TLS Online TPP Program

#Question id: 13193

#Unit 1. Molecules and their Interaction Relevant to Biology

Data, collected from DNAs of a great many different species, led Chargaff to the following conclusions:
A. The base composition of DNA generally varies from one species to another.
B. DNA specimens isolated from different tissues of the same species have the different base composition.
C. The base composition of DNA in a given species changes with an organism’s age, nutritional state, or changing environment.
D. In all cellular DNAs, the sum of the purine residues equals the sum of the pyrimidine residues.
Which of the above statements are INCORRECT regarding Chargaff’s rule?
TLS Online TPP Program

#Question id: 10476

#Unit 1. Molecules and their Interaction Relevant to Biology

Following statements are regarding to gangliosides.

A. They are ceramides with attached oligosaccharides that include at least one sialic acid residue.

B. They are ceramides with attached oligosaccharides that include at least one phasphatidic acid residue.

C. Sialic acid gives gangliosides the negative charge at pH 7 that distinguishes them from globosides.

D. Gangliosides are primarily components of cell-surface membranes and constitute a significant fraction (6%) of brain lipids.

Which of the following combination is correct?
TLS Online TPP Program

#Question id: 10475

#Unit 1. Molecules and their Interaction Relevant to Biology

During the formation of a blood plasma protein The aromatic ring of vitamin K undergoes:
TLS Online TPP Program

#Question id: 10474

#Unit 1. Molecules and their Interaction Relevant to Biology

Lipids differ from other large biological molecules in that they
TLS Online TPP Program

#Question id: 10473

#Unit 1. Molecules and their Interaction Relevant to Biology

Cleavage of beta-carotene by BCMO1 yields two molecules of :
TLS Online TPP Program

#Question id: 10321

#Unit 1. Molecules and their Interaction Relevant to Biology

The human blood groups (O, A, B) are determined in part by the oligosaccharide head groups of these glycosphingolipids. Which of the following is correct?