Free NEET Biology Questions and Answers

Question 1

The carbon dioxide produced during cellular respiration is

Accepted Answer

taken out

Answer

During cellular respiration, glucose is oxidized to produce energy (ATP), and carbon dioxide (CO2) is generated as a metabolic waste product. This CO2 is transported by the blood to the lungs, where it is subsequently expelled from the body through the process of exhalation. Therefore, the carbon dioxide produced is taken out.

Question 2

Which process produces oxidative phosphorylation?

Accepted Answer

ATP in respiration

Answer

Oxidative phosphorylation is the metabolic pathway that generates the vast majority of ATP during aerobic respiration. This process occurs in the mitochondria, where energy released from the electron transport chain is used to power the synthesis of ATP from ADP and inorganic phosphate. It is the most efficient method of ATP production in cells.

Question 3

What is glycolysis' final result?

Accepted Answer

Pyruvic acid

Answer

Glycolysis is the initial metabolic pathway in cellular respiration, occurring in the cytoplasm. During this process, one molecule of glucose, a six-carbon sugar, is broken down into two molecules of pyruvic acid, a three-carbon compound. Therefore, pyruvic acid is the final result of glycolysis.

Question 4

The connection between the Krebs cycle and glycolysis is modified before pyruvate enters the cycle to

Accepted Answer

Acetyl CoA

Answer

Before pyruvate, the end product of glycolysis, can enter the Krebs cycle (also known as the citric acid cycle), it undergoes an intermediate step called pyruvate oxidation. In this step, pyruvate is converted into Acetyl CoA, a two-carbon molecule that then condenses with oxaloacetate to begin the Krebs cycle. Acetyl CoA thus serves as the crucial link between glycolysis and the Krebs cycle.

Question 5

NADP+ conversion to NADPH is reduced in

Accepted Answer

Calvin cycle

Answer

The Calvin cycle is the set of light-independent reactions in photosynthesis where carbon dioxide is fixed and converted into glucose. This process requires reducing power, which is supplied by NADPH. Specifically, NADPH is utilized to reduce 3-phosphoglycerate to glyceraldehyde-3-phosphate, providing the electrons necessary for carbohydrate synthesis within the cycle.

NEET - National Eligibility cum Entrance Test Practice Test

NEET - National Eligibility cum Entrance Test Practice Test

Free NEET Biology Questions and Answers