Practice Questions

TLS Online TPP Program

#Question id: 760

Which force can stabilize a DNA double-helix?

#Unit 1. Molecules and their Interaction Relevant to Biology

Hydrophobic bases are found in the interior of the helix where each base pair is stabilized by the same number of hydrogen bonds.
Hydrophilic sugar-phosphate groups are found on the exterior of the helix where they can interact with water.
Non-covalent N-glycosidic bonds can form between nitrogenous bases in opposite strands in the helix.
Covalent base-stacking interactions can occur between adjacent bases within the same strand in the helix.

More Questions

TLS Online TPP Program

#Question id: 12583

#Unit 10. Ecological Principles

Which of the following is caused by excessive nutrient runoff into lakes?

TLS Online TPP Program

#Question id: 12584

#Unit 10. Ecological Principles

Which of the following causes excessively high levels of toxic chemicals in fish-eating birds?

TLS Online TPP Program

#Question id: 12585

#Unit 10. Ecological Principles

Agricultural lands frequently require nutritional supplementation because

TLS Online TPP Program

#Question id: 12586

#Unit 10. Ecological Principles

A biome with dry and rainy seasons, trees in patches, and ground cover of tropical bunchgrass is called a

TLS Online TPP Program

#Question id: 12587

#Unit 10. Ecological Principles

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

TLS Online TPP Program

#Question id: 12588

#Unit 10. Ecological Principles

According to the equilibrium model of island biogeography, species richness would be greatest on an island that is