All chemical reactions in the body are catalyzed by enzymes.
A: 正确
B: 错误
A: 正确
B: 错误
B
举一反三
- In chemical reactions, all electrons rearrange around the nuclei.
- Enzymes speed up chemcial reactions by... A: lowering activation energy. B: increasing the activation energy needed. C: breaking the chemical energy needed. D: stopping the chemical reaction.
- Which one of the following enzymatic reactions is reversible? ( ) A: The reaction catalyzed by glycogen phosphorylase B: The reaction catalyzed by phosphoglycerate kinase C: The reaction catalyzed by pyruvate kinase D: The reaction catalyzed by fructose bisphosphatase-1 E: The reaction catalyzed by hexokinase
- All spontaneous reactions are exothermic. A: 正确 B: 错误
- All exothermic reactions are spontaneous reaction . A: 正确 B: 错误
内容
- 0
The changes of chemical reactions include:
- 1
Over 100,000 chemical reactions _____ the brain every second.
- 2
Which of the following reactions cannot be catalyzed by reverse transcriptase?() A: RNA→RNA-DNA B: RNA-DNA→DNA C: DNA→DNA-DNA D: DNA→RNA
- 3
All spontaneous reactions are exothermic.
- 4
The receptors for EGF, NGF, IGF and PDGF are essentially enzymes. A: 正确 B: 错误