객관식
In which of the steps of aerobic and anaerobic cellular respiration does substrate-level phosphorylation occur?
5538
views
39
rank
1
comments
12. Microbial Metabolism
Fermentation & Anaerobic Respiration
1:57분문제 9
교과서 질문
Use the following choices to answer the question.
a. E. coli growing in glucose broth at 35℃ with O2 for 5 days
b. E. coli growing in glucose broth at 35℃ without O2 for 5 days
c. Both a and b
d. Neither a nor b
Which culture uses NAD+ ?
검증된 단계별 안내1
Step 1: Understand the role of NAD⁺ in cellular metabolism. NAD⁺ (nicotinamide adenine dinucleotide) is a coenzyme that acts as an electron acceptor in redox reactions, especially during glycolysis and cellular respiration.
Step 2: Identify the metabolic pathways used by E. coli under different oxygen conditions. When oxygen is present (aerobic conditions), E. coli performs aerobic respiration, where NAD⁺ is reduced to NADH during glycolysis and the Krebs cycle.
Step 3: Consider the anaerobic condition (without O₂). In the absence of oxygen, E. coli switches to fermentation or anaerobic respiration, which also requires NAD⁺ to accept electrons during glycolysis to keep the pathway running.
Step 4: Analyze the options: both aerobic (a) and anaerobic (b) growth require NAD⁺ to accept electrons during glycolysis, so both cultures use NAD⁺.
Step 5: Conclude that the correct choice is the one indicating that both cultures use NAD⁺, because NAD⁺ is essential for energy metabolism regardless of oxygen presence.
비슷한 문제에 대한 검증된 영상 답변:이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
1m주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Role of NAD⁺ in Cellular Metabolism
NAD⁺ (nicotinamide adenine dinucleotide) is a crucial coenzyme that acts as an electron carrier in metabolic reactions. It accepts electrons during the breakdown of glucose, becoming NADH, which then transfers electrons to the electron transport chain or other pathways to regenerate NAD⁺. This regeneration is essential for continuous glycolysis and energy production.
추천 영상:
02:17
Introduction to Metabolism
Aerobic vs. Anaerobic Respiration in E. coli
E. coli can grow in both the presence and absence of oxygen. Under aerobic conditions, NADH donates electrons to oxygen via the electron transport chain, regenerating NAD⁺ efficiently. Under anaerobic conditions, E. coli uses fermentation or anaerobic respiration to regenerate NAD⁺, allowing glycolysis to continue despite the lack of oxygen.
추천 영상:
03:35Anaerobic Respiration
Glucose Metabolism and NAD⁺ Utilization
During glucose metabolism, NAD⁺ is reduced to NADH in glycolysis and the Krebs cycle. For metabolism to continue, NADH must be oxidized back to NAD⁺. Both aerobic and anaerobic growth conditions require NAD⁺ to accept electrons, but the mechanisms of NAD⁺ regeneration differ depending on oxygen availability.
추천 영상:
02:17Introduction to Metabolism
관련 영상
관련 실천