AP Biology Quizzes Online & Trivia

Option B - Food -> NADH -> Electron transport chain -> oxygen is the correct sequence of electron travel during aerobic respiration. In aerobic respiration (also known as cellular respiration) electrons travel in this sequence: electrons are picked up from the food by NADH and FADH, the electron picked is then transferred to the electron transport chain through a proton pump, the activity of the pump creates an electrochemical gradient, an enzyme called ATP synthase uses the electrochemical gradient produced to generate ATP. The last acceptor of an electron in aerobic respiration is oxygen, an electron is donated to oxygen to produce water.

In the eukaryotic cell, there are many parts. There are lipids and proteins between the membranes of the endomembrane system. The endomembrane system are in the cytoplasm within these cells. In the system, the parts include organelles, nuclear membrane, endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, endosomes. Each of these parts performs a function in order to allow the entire eukaryotic cell to function. One part is known as the Golgi apparatus. The function of the Golgi apparatus is in sorting the membrane components. The Golgi apparatus looks like a bunch of sacs. These sacs are called the cisternae. There are also vacuoles. Vacuoles are similar to vesicles and are also sacs located inside the cell. Eukaryotic cells are known as plant cells.

The question says level from smallest to largest so why specices largest than kinkdom

Starch is present in plants. It is a soft, white, tasteless powder that is insoluble in cold water, alcohol, or other solvents. All starch contains a form of sugar. A solution of starch is sensitive to the temperature at which it is kept. Usually, decomposition reactions require energy input. The decomposition temperature of starch is not due to water content because water may evaporate from a sample before reaching the decomposition temperature. Answer B is correct. The hydrolysis of starch to sugar is endergonic: endergonic reactions need an input of energy to occur.

Allosteric inhibition is the progression by which a regulatory molecule attaches to an enzyme in a spot different from the active site for an additional particle, which causes a conformational alteration in the dynamic place for the second molecule, thwarting binding. This progression is also known as noncompetitive inhibition. A similar method is used in allosteric activation, in which the modification of the binding site increases the binding of the second molecule, which is referred to as noncompetitive initiation. In a method similar to allosteric inhibition, competitive inhibition is also used to prevent enzymatic activation. In competitive inhibition, the controlling molecule binds to the same site as the other molecule, which hinders binding from occurring.

Thylakoids are special stacks that are present within a chloroplast of a plant cell. Chloroplasts are organelles that are responsible for photosynthesis. These thylakoids contain the pigment chlorophyll on their membranes. This pigment absorbs the energy from the sun and allows the chloroplast to use it for photosynthesis. If the thylakoids are destroyed, the pigment inside them will be lost, ultimately, the chloroplast will not be able to harness the suns energy to energize the electros. The electron transport chain will not proceed and AP will not be formed. This will halt photosynthesis, and the plant will no longer be able to use CO2 from the atmosphere to form glucose.

A cell has many chemical reactions occurring simultaneously. The metabolism is always at work and is driven by these chemical reactions. However, in a state of equilibrium the substrates and reactants are in a specific ratio without any changes. In other words it can be said that a chemical reaction in equilibrium is one in which the reactants and products in a metabolic pathway are both used in a metabolic pathway, which is in fact inactive. Although, in reality this means that the rate of substrate and products interconverting into one another is equal, which gives the impression as if nothing is happening and the pathway is inactive.

Is "gycerol" (glycerol) purposefully spelled wrong? If yes, then I guess "none" is correct. However, if it was a grammar mistake, and it was indeed meant to be "glycerol" than lipids, in specific phospholipids, include a glycerol molecule.

Mitochondrion is the part of the eukaryotic cells that is found in the cytoplasm of the cells. These cells have a nucleus. There are other parts inside the cells including the mitochondrion. They are usually in the shape of an oval. The energy that is performed in the cell is called adenosine triphosphate. First, the electrons are in the citric acid cycle where they make the energy in the form of ATP. The electrons are in the nicotinamide adenine dinucleotide and move them through the cell of the electron transport chain to the oxygen. Then the oxygen becomes water. During this process, the donors that are the electrons transfer the energy to the acceptors. This process is quite complex in nature.

B is the answer to this question. The process of donating and sending electrons is always going to be important because this is the only way that the atoms will be stable. If there are no electrons that will be shared, it will be problematic. For example, in aerobic respiration, it will be oxygen that will be the last electron acceptor. What will happen when there is no oxygen available? All of the electrons that are there will not be able to get out and mix with other atoms. Instead, the electrons will be stuck and no reaction will take place. Reactions are always important for electrons so without it, the transport chain will not occur.

The correct answer is option E – Facilitated diffusion Glucose is a large molecule, and it would be difficult for it to pass through the phospholipid bilayer, as so, facilitated diffusion is the transport mechanism that functions in the absorption of glucose in the intestinal cells. Glucose is transported against the concentration gradient and with the aid of the carrier protein located at the membrane; glucose is transported from one end of the layer to another. The movement of glucose can be rapid or slow, this depends on the number of carrier protein available at the membrane. Facilitated diffusion helps in the release of accumulated glucose into the extracellular space adjacent to the blood capillary Hope this helps!

The answer to this question is letter D. Surface tension is a fluid’s elastic tendency that makes the surface have the most possible surface area. This phenomenon allows small insects to slide and float on a surface of the water. Surface tension happens when liquid molecules have a greater attraction to each other than the air molecules. The effect of this is the water creates an elastic membrane due to the inward force of at the surface. Not all liquid has this tendency like water as water has more and stronger hydrogen bonds that create higher attraction of water molecules. The surface tension of water is 72.8 millinewtons per meter at a temperature of 20 °C more than most liquids.