What are the most difficult concepts for students to understand?

What happens when DNA is not copied correctly?

Assume that you are trying to identify an unknown organic molecule. It contains only carbon, hydrogen, and oxygen and is found in the cell walls of a newly discovered plant species. What type of organic compound is it? Why?

Organisms that are not autotrophs A. Get energy from inorganic molecules B. Can survive with energy C. Must consume other organisms to get energy D. Get energy from sunlight

A newly developed drug causes users to lose some muscle control and slur their speech. the drug also results in a slowing of central nervous system activity. most likely, this drug is a:

This is the decent of different species from a common species over many generations

A bacterial cell with which of the following modifications might be resistant to antibiotics such as methicillin?

What happens to air when it heats up

Explain the importance of to the field of genetics

True or False In sexual reproduction, two diploid cells can fuse to form a haploid cell

Martinus beijerinck developed the enrichment culture technique to isolate metabolically-distinct microbes from complex natural samples, like soil and water, by manipulating the