The length of time for half of the radioactive atoms in a sample to decay is its ...

When the his-Salmonella strain used in the Ames test is exposed to substance X, no his + revertants are seen. If, however, rat liver supernatant is added to the cells along with substance X, revertants do occur.

Elephants exhibit herding behavior. When they travel, the oldest and largest members often travel in the outer edges of the group. Why is this important to the survival of the species

Planets store carbohydrates as what

What are some example of a scientific law?

Part B Remember that each amino acid change is caused by a single nucleotide substitution. Use this information to further limit the possible codons for each amino acid Which of the following codons could still code for arginine (Arg) ?

If you had purple flowers and white flowers the bees go visit the purple flowers more, why?

The word hyponatremia derives from the words hypo ("under" or "less") and natrium ("sodium"). The word natrium is the basis for the abbreviation Na for sodium.

Prokaryotes whose cell walls do not contain peptidogly can

Which is true regarding tolerable upper intake levels (uls) ?

Which cells quickly respond to produce antibodies on second exposure to the same antigen?