Cell Biology Questions
Explore questions in the Cell Biology category that you can ask Spark.E!
Pepsin is an enzyme that breaks down protein but will not act on starch. This fact is an indication that enzymes are _____. - catalytic - hydrolytic - specific - temperature sensitive
Biological catalysts __________. - are organic substances that lower the activation energy required to initiate a reaction that would normally take place at a slower rate - are broken down and destroyed as part of the chemical process they help initiate - are seldom regulated by the molecules that participate in the catalyzed reactions - can speed up any reaction, even those that would not occur naturally
Activation energy __________. - is required for endergonic reactions - is produced by exergonic reactions - is required for all chemical reactions - is produced by endergonic reactions
In a chemical reaction, the _____ are the atoms or molecules that enter into the reaction. The _____ are the chemicals or atoms produced by the reaction. - products, reactants - reactants, products - receptors, products - catalysts, reactants
ATP is well suited to its role as an energy-carrier molecule in cells because __________. - the covalent bond between the last two phosphates can be broken to release substantial amounts of energy - it contains covalent bonds - it is small and can fit into a lot of places in the cell - the sugar portion of the molecule can be used as an energy source
The laws of thermodynamics define the properties and behavior of energy. The first law states that energy __________.- cannot be created or destroyed but can be changed from one form into another - can be created by thermonuclear explosions - equals mass times the speed of light, squared (that is, E = mc2) - is the basic structure of the universe
Enzyme regulation can be precisely controlled through a variety of mechanisms such as __________. - production of an inactive form of an enzyme that will become activated only when needed - using a coenzyme that is necessary for function - binding of a competitive inhibitor to the active site - activation of an inactive enzyme, use of a coenzyme, allosteric regulation, and competitive inhibition of the enzyme.
In endergonic reactions, __________. - the reactants have more potential energy than the products - energy is released - a net input of energy is not required - the products have more potential energy than the reactants.
Which of the following does not illustrate kinetic energy? - a car moving at 55 mph - a 100-watt light bulb, turned on - a 9-volt battery - a water droplet going down a waterfall - the electrical current used to perk coffee
Does NADH or FADH2 enter at higher energy
How many NAHD are produced my glycolysis?
How much energy is captured within ATP and released as heat
What molecule stays in the citric acid cycle
How many ATP are invested in glycolysis?
What molecule enters the citric acid cycle?
Where do NADH and FADH2 enter the electron transport chain?
Does a plant or animal cell have a cell wall?
How many ATP are produced in the citric acid Cycle?
area synthesizes the RNA into its three types
bundles of protein fibers that give shape and structure to the cell