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TLS Online TPP Program

#Question id: 12755

Which of the following statements best describes why biologists are currently concerned with global warming and the thawing of permafrost in many areas of the tundra biome?

#Unit 10. Ecological Principles
  1. The thawing process will likely decrease the abundance and diversity of soil-dwelling organisms in tundra habitats.
  2. The bacterial decomposition of  the thawed organic materials on  the widespread areas of  the tundra will produce large quantities of CO2, which will add to greenhouse gases and exacerbate global warming.
  3. Oil and coal deposits will thaw and rise to the surface (because of their lower density) of the tundra, destroying millions of acres of arctic habitat.
  4. Populations of humans inhabiting the arctic will have to move to more southern latitudes, resulting in in- creased competition for resources in already densely populated areas.
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TLS Online TPP Program

#Question id: 12608

#Unit 10. Ecological Principles

The  amount of  chemical energy in  consumers? food that is  converted to  their own  new biomass during a  given time period is known as which of the following?
TLS Online TPP Program

#Question id: 2233

#Unit 2. Cellular Organization

Membrane proteins may interact with biomembranes through

a. covalently attached fatty acid molecules.

b. covalently attached lipid molecules.

c. noncovalent protein-protein interactions.

d. hydrophobic α-helical domains.

e. noncovalent protein-lipid interactions.
TLS Online TPP Program

#Question id: 4123

#Unit 3. Fundamental Processes

A certain bacterial mRNA is known to represent only one gene and to contain about 800 nucleotides.  If you assume that the average amino acid residue contributes 110 to the peptide molecular weight, the largest polypeptide that this mRNA could code for would have a molecular weight of about:
TLS Online TPP Program

#Question id: 28972

#Unit 7. System Physiology – Animal

hormones of adrenal cortex are derivatives of cholesterol convert to pregnenolone is catalyzed by enzymes in mitochondria, known as__ 
TLS Online TPP Program

#Question id: 11500

#Unit 9. Diversity of Life Forms

The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following?