biology

what wavelength of light in the figure is most effective in driving phososynethsis

420 nm

The figure illustrates the energy states associated with the reaction A+B➡️C+D which of the following represents the activation energy required for the non enzyme catalyze reaction in the figure

C

which of the following statements is true for all exergonic reactions

The reaction proceeds with a net release of free energy

Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase The zinc most likely functions as

a cofactor necessary for enzyme activity

which of the following is an example of potential rather than kinetic energy

a molecule of glucose

A series of enzymes catalyze the reactions in the metabolic pathway X➡️Y➡️Z➡️A. Product A binds to the enzyme that converts X to Y add a position remote from its active site. this binding decreases the activity of the enzyme what is substance X?

a substrate

a series of enzymes catalyze the reactions in the metabolic pathway X➡️Y➡️Z➡️A Product A binds to the enzyme that converts X to Y at a position remote from its active site. this binding decreases the activity of the enzyme that converts X to Y substance A functions as

an allosteric inhibitor

which of the following events accompanies absorption of energy by chlorophyll molecules of the reaction center complex

an electron is excited

which do the following types of reactions would decrease the entropy within a cell

anabolic reactions

which of the following statements correctly describes a distinction between autotrophs and heterotrophs

autotrophs but not heterotrophs can nourish themselves beginning with CO2 and other nutrients that are inorganic

which of the following statements describes an example of cooperatively associated with enzyme regulation

binding a substrate to one subunit of a tetramer stimulates faster binding of substrate to each of the other 3 subunits

how does a non competitive inhibitor decreased the rate of an enzyme catalyze reaction

by binding to an allosteric site, thus changing the shape of the active site of the enzyme

which of the following terms most precisely describes the cellular process of breaking down large molecules into smaller ones

catabolism

how do cells use the ATP cycle illustrated in the figure

cells use the cycle to recycle ADP and phospate

HIV is the virus that causes AIDS in the mid 1990s, researchers discovered an enzyme in HIV called protease. once the enzymes structure was known, researchers began looking for drugs that would fit into the active site and block it. If this strategy for stopping Hiv infections were successful, it would be an example of what phenomenon?

competitive inhibition

which of the following conditions may be overcome by increasing the substrate concentration in an enzymatic reaction with a fixed amount of enzyme

competitive inhibition

which temperature and pH profile curves on the graphs are most likely associated with an enzyme isolated from a human stomach where conditions are strongly acid?

curves 1 and 4

the figure illustrates the engergy states associated with the reaction A+B➡️C+D which of the following in the figure would be the same in either an enzyme catalyzed or a noncatalyzed

d

Chemical reaction that has a positive 🔼G is best described as

endergonic

The figure illustrates the energy states associated with the reaction A+ B➡️C + D. Which of the following terms best describes the forward reaction in the figure?

exergonic 🔼G<0

in autotrophic bacteria where is chlorophyll located

in unfolded regions of the plasma membrane

which do the following is a primary function of the active site of an enzyme

it catalyze the reaction associated with the enzyme

when chemical transport or mechanical work is done by an organism what happens to the heat generated

it is lost to the environment

what happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electron carriers

it is used to establish and maintain a proton gradient

when ATP releases some energy it also releases inorganic phosphate what happens to the inorganic phosphate in the cell

it may be used to from a phosphorylated intermediate

which do the following statements summarizes the metabolic results of photorespiration

it produces carbon dioxide and consumes ATP and oxygen

in addition to activating or inhibiting enzymes through allosteric regulation what other means does the cell use to control enzymic activity

localization of enzymes into specific organelles or membranes

which do the following statements best describes the relationship between photosynthesis and cellular respiration

photosynthesis stores energy in complex organic molecules cellular respiration releases energy from complex organic molecules

what more needs to occur to complete the calvin cycle

regeneration of RuBP

the oxygen released by photosynthesis is produced by which of the following processes

splitting water molecules

in mitochondria an electron transport chain pumps protons from the matrix into the inter membrane space whereas in cholorplasts an electron transport chain pumps from the

strong to the thylakoid space

which of the following statements correctly describes the role played by molecules described in the reaction

succinate is the substrate and fumarate is the product in the reaction

what would be a likely consequence of a mutation in plants that results in photorespiration deficiency

there would be more cellular damage from harmful products of the light reactions of photosynthesis

which do the following statements describes a common characteristic of catabolic pathways

they are exergonic and provide energy that can be used to produce ATP from ADP and Pi-

which of the following statements about anabolic pathways is true

they consume energy to build up polymers from monomers

why are the reaction centers of photosystem a composed of several structurally different pigments

this arrangement enables the plant to absorb light energy of a variety of wavelengths

the mathematical expression the change in energy of a system is 🔼G=🔼H-T🔼S. which of the following statements is correct?

🔼G is the change in free energy