A) the carotenoids and other pigments are still present in the leaves
B) degraded chlorophyll changes color
C) water supply to the leaves has been reduced
D) the cells of the leaves begin to die
Correct Answer
verified
Correct Answer
verified
A) phospholipid
B) water
C) pigment
D) electron carrier
Correct Answer
verified
Correct Answer
verified
A) are membrane proteins present in the thylakoid
B) are free proteins present in the thylakoid lumen
C) are considered to be part of the reaction center of photosystem I
D) absorb the same wavelengths of light as their associated chlorophylls
Correct Answer
verified
Correct Answer
verified
A) metabolic reactions are catalyzed by enzymes that have multiple functions
B) there is a close relationship between carbohydrate synthesis and carbohydrate metabolism
C) the Calvin cycle is nearly ubiquitous in cells,as are metabolic pathways
D) the Calvin cycle probably evolved at the same time as did glycolysis
Correct Answer
verified
Correct Answer
verified
A) C₄ plants undergo carbon fixation by carboxylation of a four-carbon substrate (oxaloacetate) ,while in C₃ plants,a three-carbon compound (phosphoglycerate) is carboxylated.
B) Both C₃ and C₄ plants involve carboxylation of ribulose-1,5-bisphosphate by rubisco;but in C₃ plants,the first stable intermediate is 3-phosphoglycerate,and in C₄ plants,it is oxaloacetate.
C) C₃ plants don't undergo photorespiration,but C₄ plants do.
D) Rubisco is the primary enzyme that catalyzes carbon fixation in C₃ plants,and phosphoenolpyruvate carboxylase can catalyze carbon fixation in C₄ plants.
Correct Answer
verified
Correct Answer
verified
A) NAD⁺ functions as an electron transporter,whereas NADP does not.
B) NAD⁺ functions as a free-energy source for cells,whereas NADP does not.
C) Both function as electron carriers,but NADP has a phosphate group and NAD⁺ does not.
D) Both transport electrons to the electron transport chain (ETC) found on the inner mitochondrial membrane,but NADP transfers its electrons to the ETC at a higher energy level.
Correct Answer
verified
Correct Answer
verified
A) irradiating a leaf extract with red light
B) introducing radiolabeled carbon dioxide into a plant extract and determining which molecules become radiolabeled
C) purifying a variety of proteins from plant extracts and testing each protein individually to see if it can carboxylate ribulose-1,5-bisphosphate
D) differential sedimentation of a protein extract
Correct Answer
verified
Correct Answer
verified
A) The products of the light-independent reactions are used in the light-dependent reactions.
B) The products of light-dependent reactions are used in light-independent reactions.
C) The products of light-independent reactions must be present for light-dependent reactions to take place.
D) They are not related.
Correct Answer
verified
Correct Answer
verified
A) their ability to stabilize free radicals
B) their ability to temporarily shut down photosynthesis
C) their ability to reflect ultraviolet light
D) their ability to absorb ultraviolet light
Correct Answer
verified
Correct Answer
verified
A) once chloroplasts are destroyed,the free radicals will destroy the cell
B) carotenoids probably have a protective function in the cell
C) free radicals induce the synthesis of carotenoids in chloroplasts
D) carotenoids communicate directly with the immune system of plants
Correct Answer
verified
Correct Answer
verified
A) a process that rarely occurs in photosynthetic organisms
B) a process involving addition of oxygen to ribulose-1,5-bisphosphate and the formation of ribose-1,5-diphosphate
C) a process involving the addition of oxygen to ribulose-1,5-bisphosphate and the formation of the products 3-phosphoglycerate and 2-phosphoglycolate
D) a process involving the carboxylation of ribulose-1,5-bisphosphate
Correct Answer
verified
Correct Answer
verified
A) red and orange light
B) green and blue light
C) violet and red light
D) red and blue light
Correct Answer
verified
Correct Answer
verified
Showing 21 - 32 of 32
Related Exams