A codon, or a group of how many nucleotides, stands for a particular amino acid?

Summarize the molecular evidence for the common origin of living organisms.

Each of DNA's four kinds of bases can pair with only one of the other DNA bases. Using the base-pairing rules, which of the following is the correct order of bases that would pair with the following string of bases on a DNA molecule:

What is the oldest known organism based on fossil record. A) bacteria B) viruses C) Cyanobacteria D) fossils

Enzymes are proteins that speed up reactions by providing an additional energy source supplying additional molecules for the reaction removing inhibitors that slow down reactions lowering the amount of energy required

The the single factor tested in an experiment is

What does it mean when a biologist uses the term crossing-over? why is crossing over a good thing?

which would provide the body with the most energy? a. forming bonds between to amino acids b. braking the bonds in a monosaccharide c. braking a single carbon bond d. creating bonds to form a carbohydrates

You have a liposome containing an interior aqueous solution containing 200 mM of NaCl. If you want to shrink the liposome, what should be the concentration of solution of NaCl in which you would you drop it? Give a specific concentration (mM).

Which of the following is an example of qualitative observation?

Small rice-like objects are found in the hair on the back end of a cat. What is the most likely parasite infecting this cat?