The term "cycle" is used to describe the Calvin cycle because:
the process begins and ends with RuBP (a five carbon sugar)
In the light reaction, light energy is transferable among the various pigments bust must eventually be absorbed by molecules of
The characteristic dark tail, ears, face, and paws of a siamese cat result from
variations in pigment production by a heat-senesative enzyme
*For each molecule of glucose converted to pyruvic acid:
Two molecules of ATO are used and Four are produced
What provides the carbon atoms that are incorporated into sugar molecules in the Calvin cycle?
Carbon dioxide (CO2)
Which of the following occurs during the Calvin cycle of photosynthesis
Carbon dioxide is converted to chemicals that can be used to make sugars
The energy of the movement of electrons down a concentration gradient via electron transport within the thylakoid membrane is used to generate:
Stomata are pores found in the leaves and stems of plants. heat is their purpose?
Stomata open to allow gas exchange and close to prevent the loss of water
In the metabolism of glucose, almost all organisms first break down or split glucose into pyruvic acid in the set of reactions called:
Suppose you are studying photosynthesis in a research lab. you grow your plants in a chamber with a source of water that has a radioactively labeled oxygen atom. What photosynthetic product will be radioactive
The light reactions take place in the ______ and Calvin cycle takes place in the _______.
the cellular work is accomplished by the energy provided when ATP donates one of its high energy:
What is the role of chlorophyll in plants?
chlorophyll captures solar energy to produce plant energy
Organisms that derive their chemical energy from the process of chemosynthesis (without light ever) may be found:
deep ocean rifts
You have a friend who tells you she is lactose intolerant. She asks you to explain what this means
You cannot digest milk because you do not have enzyme to break down the sugar in the milk
How many carbon dioxide molecules must be added to RuBP (5 carbon molecule) to make a single molecule of glucose?
In certain organisms and under certain conditions ______ can be used as an energy alternative to glucose
All of the above
How many net ATP molecules are produced by the breakdown of a glucose molecule in the glycolysis pathway:
Why do chloroplasts make energy carriers during the light reactions?
to provide energy for the synthesis of sugar
Suppose you are studying photosynthesis in a research lab. You grow your plants in a chamber with a source of CO2 that has a radioactively labeled carbon atom. What photosynthetic product will be radioactive?
* An electron-transport chain for photoautotrophs is located in which of the following:
* Which of the following accurately describes energy?
something that has the capacity to bring about change (work)
Chemical agents produced by living things and having the capacity to control the rate and direction of chemical reactions in an organism are known as:
The energy of the movement of electrons down a concentration gradient via electron transport within chloroplast and mitochondria is used to generate molecules of
Which of the following statement is true about NADPH?
It is produced in the light-dependent reactions of photosynthesis
The main function of cyclic photophosphorylation (Photosystem I) in photosynthesis is to:
In the following reaction, which of the following is/are an example of an enzyme?
Lactose --Lactase--> Glucose + Galactose
During photosynthesis, which step is most responsible for a plants acquisition of new organic material (or carbon)?
the "plucking" of one CO2 molecule from the air by a 5-cabon compound (RuBP)
* The active site of an enzyme:
is a groove or crevice in the structure of the enzyme complementary to the substrate
Animals have enzymes that break apart starch molecules but not cellulose, despite the fact that both are made up of glucose subunits. Which enzyme characteristic BEST explains this?
Enzymes are highly specific
The energy necessary to encourage two atoms to react and form a bond is called:
the activation energy
Dark reactions (or LIght Independent Reactions) can be called "dark reactions" because:
They do not depend directly on sunlight as long as ATP and NADPH2 are available
Almost all of the energy-requiring chemical reactions of the cell get their energy directly from:
Cyclic photophosphorylation is called cyclic because:
an electron leaving a chlorophyll molecule returns to it
* Which of the following is in correct order with respect to decreasing energy levels (potential energy) of the compounds:
ATP, ADP, CO2
Enzymes act as ____ that change the rate of a chemical reaction without being destroyed in the process:
Most enzymes do not work if the temperature is raised too much, why is this?
Enzymes denature or "cook" at higher temperatures
Outside the body, sugar can catch fire and burn in an exergonic reaction. Inside the body, we also talk about burning sugar in an exergonic reaction, BUT it NEVER catches a body on fire. Why not?
When sugar is lit on fire, all of the bonds are broken at once. When the body breaks down sugar, enzymes break down one bond at a time