How many nitrogen atoms are in one molecule of the compound Al (NH3) 2?

Once DNA is collected at a crime scene, it must be processed in the lab. If there is a limited quantity of DNA available, what step must the technician take in this process?

If the age of the middle layer of a rock sample is between 300 million years and 1 billion years, which of the following could be the age of the lowermost layer?

ELISA immunoassay experiment 1. The samples that youa dded to the microplate strip contain many proteins and may or may not contain the antigen.

Indicate if the following statements about prokaryotes are true or false. A. They contain a plasma membrane B. They contain internal membrane-bound organelles C. They have a cell wall D. They have ribosomes

What purpose does mRNA serve?

What are chemical mechanisms that start a reaction

A person cannot become a problem drinker by drinking beer. a. true b. false

Which is the best description of a galaxy?

Evrey cell contains DNA. The main purpose of DNA is to store the genetic info. How does DNA control the cell? A. DNA activates nerve signals B. DNA determines what proteins are made C. DNA protects the cell from invaders D.

Which combination describes the plasma membrane? a. hydrophilic interior, hydrophobic exterior b. hydrophilic interior and exterior c. hydrophobic interior, hydrophilic exterior d. hydrophobic interior and exterior?