According to the scientists, life came from ___________. A: combination of energy and biochemical materials B: combination of nucleic acid and amino molecules C: nucleic acid molecules D: amino acid molecules

Regardless of its strength, the binding of a protein to other biological molecules always shows great _________: each protein molecule can bind to just one or a few molecules out of the many thousands of different molecules it encounters.

Moisture in food can be divided into "bound water" and "free water" according to different properties. Which of the following is not bound water? A: The first layer of water molecules adsorbed to glucose molecules B: Water molecules with unpaired electrons entering the outer empty orbits of sodium ions C: Water molecules adsorbed in capillaries in food tissue D: Water molecules bound to the negative ion of glutamic acid on the protein peptide chain

What is the woman studying A: The kinds of molecules in which carbon may be replaced by silicon. B: The importance of silicon. C: The difference between molecules and silicon.

Which of the following cell signaling molecules does the neurotransmitter belong to? ( ) A: Chemical signal B: Gas molecules C: Optical signal D: Electric signal

In gel electrophoresis, （）proteins move rapidly through the gel. A: Large molecules B: Small molecules C: Both move together D: The above options are not selected

Cohesion is the force ____ like molecules attract each other.

tRNA molecules are synthesized without the need for intermediary mRNA.

What does the woman expect to learn from her study A: The kinds of molecules in which carbon may be replaced by silicon. B: The importance of silicon. C: The difference between molecules and silicon.

How many types of oxygen molecules makes up ozone?