Changes on the number, type, or order of bases on a strand of dna are

A middle-aged client with a 30-year history of smoking was diagnosed with lung cancer. A health history revealed previous exposure to air pollution, asbestos, and radiation.

Which best describes what happens to a developing fetus during the third trimester? A. The external sex organs develop. B. The limbs form. C. The organs grow larger. D. The eyes develop.

Prior to the elucidation of the genetic code, prominent scientists, including Francis Crick, had predicted that each mRNA codon, coding for one of the 20 amino acids, needed to be at least three nucleotides long.

Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type of dominance is exhibited by the offspring A-complete dominance B-blended dominance C-codominance D-incomplete dominance

Which statement is true of prokaryotes but not eukaryotes A. Some are multicellular B. They have no ribosomes C. They have no water D. All are unicellular

Which of the following are items that are a threat to biodiversity? pollution and succession habitat loss and predation poaching and habitat loss succession and poaching

What weather follows a cold front?

A healthy environment depends on bio geochemical cycles maintaining a balance of input and output. When forests are cut down, which process of the carbon cycle is most affected?

Aircraft that achieve forward propulsion by expelling a stream of fluid are called

The place where reactants bind to an enzyme during a reaction is called the