Group I introns are remarkable because: A: They are spliced by external RNA molecules without protein involvement. B: They are spliced by protein molecules in the absence of external RNA molecules. C: They are autocatalytic. D: They are only present in mitochondrial and chloroplast genomes.
Group I introns are remarkable because: A: They are spliced by external RNA molecules without protein involvement. B: They are spliced by protein molecules in the absence of external RNA molecules. C: They are autocatalytic. D: They are only present in mitochondrial and chloroplast genomes.
Which of the following statements best describes a laser A: A device for stimulating atoms and molecules to emit light. B: An atom in a high-energy state. C: A technique for destroying atoms or molecules. D: An instrument for measuring light waves.
Which of the following statements best describes a laser A: A device for stimulating atoms and molecules to emit light. B: An atom in a high-energy state. C: A technique for destroying atoms or molecules. D: An instrument for measuring light waves.
Everything in the world is made up of atoms and molecules.
Everything in the world is made up of atoms and molecules.
Intermolecular forces are the attractive or repulsive forces between molecules.
Intermolecular forces are the attractive or repulsive forces between molecules.
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
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.
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
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.
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
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
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