FREE NEET Biology Questions and Answers
The incomplete oxidation of glucose into pyruvic acid, which involves numerous intermediate processes, is known as .
Glycolysis is the initial stage of cellular respiration and occurs in the cytoplasm of cells. It is a series of enzymatic reactions that break down glucose, a six-carbon sugar molecule, into two molecules of pyruvic acid, a three-carbon molecule. Glycolysis involves several steps and intermediate molecules, and it is the first step in both aerobic and anaerobic respiration.So, to summarize, the incomplete oxidation of glucose into pyruvic acid, involving numerous intermediate processes, is known as glycolysis.
Which of these is the ultimate respiratory substrate and produces the most ATP molecules?
Glucose is a carbohydrate and the primary source of energy for cellular respiration in most organisms. When glucose is broken down through various metabolic pathways, such as glycolysis, the Krebs cycle, and oxidative phosphorylation, it undergoes complete oxidation to produce a maximum yield of ATP.
The release of the sympathetic nerve impulses
"The release of sympathetic nerve impulses is primarily associated with the hormone ""epinephrine,"" also known as adrenaline. The sympathetic nervous system is a division of the autonomic nervous system responsible for the body's response to stress or emergency situations, often referred to as the ""fight or flight"" response. When activated, the sympathetic nervous system releases neurotransmitters, including norepinephrine and epinephrine, which are secreted by the adrenal glands. Epinephrine, specifically, plays a crucial role in coordinating the physiological changes associated with the sympathetic response. It acts as both a neurotransmitter in the sympathetic nervous system and a hormone when released into the bloodstream."
NADP+ conversion to NADPH is reduced in
During the Calvin cycle, NADP+ (nicotinamide adenine dinucleotide phosphate) acts as an electron acceptor and is reduced to NADPH. This reduction process involves the transfer of electrons and protons, leading to the formation of NADPH, which serves as a crucial reducing agent in the Calvin cycle.
Which of these does the hormone classification by their chemical makeup not include?
The classification of hormones is primarily based on their chemical structure and origin. However, "glucose-containing hormones" is not a recognized category within hormone classification. Glucose is a sugar molecule and is not directly involved in the structure or classification of hormones.
This organ is neuroendocrine.
The hypothalamus is a small region of the brain located below the thalamus. It plays a crucial role in maintaining homeostasis and regulating various physiological processes. One of its key functions is to integrate the nervous system and the endocrine system, which is why it is considered a neuroendocrine organ.Furthermore, the hypothalamus also synthesizes and releases two hormones called oxytocin and antidiuretic hormone (ADH), which are stored and released by the posterior pituitary gland.
Which process produces oxidative phosphorylation?
During cellular respiration, which occurs in the mitochondria of cells, ATP is generated through a series of enzymatic reactions. The final step of cellular respiration, known as oxidative phosphorylation, involves the electron transport chain and chemiosmosis. This process utilizes the high-energy electrons derived from molecules like NADH (produced in the earlier stages of respiration) to generate ATP.
What is glycolysis' final result?
"The final result of glycolysis is the production of pyruvic acid, also known as pyruvate. Glycolysis is the initial stage of cellular respiration and occurs in the cytoplasm of the cell. It is a series of enzymatic reactions that break down glucose (a six-carbon sugar molecule) into two molecules of pyruvic acid (a three-carbon molecule). Glycolysis involves several steps and intermediates, ultimately resulting in the production of pyruvate."
The responsibility for new messenger RNA transcription is taken up by .
Steroid hormones are a class of hormones derived from cholesterol and include hormones such as cortisol, estrogen, progesterone, and testosterone. These hormones have the ability to directly influence gene expression by binding to specific receptors inside the cell, often in the nucleus.
Select the false statement about the Krebs cycle.
The Krebs cycle, also known as the citric acid cycle or the tricarboxylic acid cycle, is a series of enzymatic reactions that takes place in the mitochondria of cells. It is an essential part of cellular respiration, where it plays a central role in the generation of energy in the form of ATP.To clarify, the Krebs cycle starts with the condensation of acetyl-CoA with oxaloacetate, not pyruvic acid, to produce citric acid (citrate). This is the initial step of the cycle.
This trait of a hormone prevents it from exerting its full action in the absence of another hormone.
Permissiveness refers to the situation in which the full expression or action of one hormone is dependent on the presence or activity of another hormone, even if the second hormone does not directly participate in the desired physiological response.Therefore, the term that describes the trait of a hormone preventing its full action in the absence of another hormone is "permissiveness."
In cellular respiration, the CH bond of food is broken down by
Cellular respiration is a metabolic process that occurs in cells to generate energy in the form of ATP (adenosine triphosphate). During cellular respiration, organic molecules such as glucose are oxidized, meaning they lose electrons, and their energy is released.In summary, in cellular respiration, the CH bonds of food molecules are broken down through oxidation reactions, leading to the release of energy and the production of ATP.
The carbon dioxide produced during cellular respiration is
During cellular respiration, which occurs in the mitochondria of cells, glucose and oxygen are metabolized to produce energy in the form of adenosine triphosphate (ATP). As a byproduct of this metabolic process, carbon dioxide is generated as waste. The carbon dioxide diffuses out of the cells and is transported via the bloodstream to the lungs.
Where is the "hormone response element" located on the cell?
Hormone response elements are specific DNA sequences that are recognized and bound by hormone receptors. These elements are typically found in the regulatory regions of genes, such as the promoter or enhancer regions. When a hormone binds to its specific receptor, the hormone-receptor complex can then bind to the corresponding hormone response element on DNA.
The connection between the Krebs cycle and glycolysis is modified before pyruvate enters the cycle to
Before pyruvate enters the Krebs cycle, it is modified into acetyl CoA through decarboxylation and oxidation reactions. Acetyl CoA then enters the Krebs cycle, where it undergoes further reactions to extract energy and produce additional molecules such as NADH and FADH2.
For every glucose molecule that enters the cell, 38 ATP molecules are used to store ________ of energy.
"During cellular respiration, one molecule of glucose can undergo glycolysis, the Krebs cycle, and oxidative phosphorylation to produce a maximum of 38 ATP molecules. Each ATP molecule carries approximately 7.3 Kcal of energy. Therefore, multiplying 38 ATP by 7.3 Kcal gives us a total energy yield of 277.4 Kcal. It's important to note that this is the maximum potential energy yield, as some energy is lost as heat during the processes. However, the closest option among the provided choices is 686 Kcal."