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33 terms

Chapter 10 & 12 Mastering Biology Questions

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Which of these equations best summarizes photosynthesis?


C6H12O6 + 6 O2 → 6 CO2 + 12 H2O
6 CO2 + 6 H2O → C6H12O6 + 6 O2
6 CO2 + 6 O2 → C6H12O6 + 6 H2O
6 CO2 + 6 H2O → C6H12O6 + 6 O2
Where does the Calvin cycle occur?
In the stroma
The light reactions of photosynthesis use _____ and produce _____.
water ... NADPH
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

A) ATP and NADPH
B) H2O and O2
C) ADP, i, and NADP+
D) electrons and H+
E) CO2 and glucose
ATP & NADPH
Where does the Calvin cycle take place?
Stroma of the choloroplast.
When oxygen is released as a result of photosynthesis, it is a direct by-product of:
Splitting water molecules
Which of the following is a product of the light reactions of photosynthesis?
oxygen, ATP, and NADPH
Which of the events listed below occurs in the light reactions of photosynthesis?

A) Light is absorbed and funneled to reaction-center chlorophyll a.
B) NADPH is reduced to NADP+.
C) Carbon dioxide is incorporated into PGA.
D) ATP is phosphorylated to yield ADP.
E) NADP is produced.
Light is absorbed and funneled to reaction-center chlorophyll a.
Which statement describes the functioning of photosystem II?

A) The splitting of water yields molecular carbon dioxide as a by-product.
B) Photons are passed along to a reaction-center chlorophyll.
C) The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH.
D) Light energy excites electrons in the thylakoid membrane electron transport chain.
E) The electron vacancies in P680+ are filled by electrons derived from water.
The electron vacancies in P680+ are filled by electrons derived from water.
Where are the molecules of the electron transport chain found in plant cells?
thylakoid membranes of chloroplasts
The reactions that produce molecular oxygen (O2) take place in:
the light reactions alone
Which process produces oxygen?
A) Cellular respiration
B) Photosynthesis
Photosynthesis
Which set of reactions uses H2O and produces O2?
A) The light-dependent reactions
B) The light-independent reactions
The light-dependent reactions
What is the importance of the light-independent reactions in terms of carbon flow in the biosphere?
The light-independent reactions turn CO2, a gas, into usable carbon in the form of sugars.
True or false? The light-dependent reactions of photosynthesis use water and produce oxygen.
True
Which of the following molecules is the primary product of photosystem I?
NADPH
What is the biological significance of the light-independent reactions of photosynthesis?
They convert carbon dioxide to sugar
Which of the following statements best describes the relationship between the light-dependent and light-independent reactions of photosynthesis?
NADPH, which are then used by the light-independent reactions.
Which of the following reactions ensures that the Calvin cycle can make a continuous supply of glucose?
Regneration of RuBP
The overall function of the Calvin cycle is _____.
Making sugar
Where do the enzymatic reactions of the Calvin cycle take place?
Stroma of the choloroplast
The NADPH required for the Calvin cycle comes from:
reactions initiated in photosystem I.
Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, i, and NADP+ to the light reactions.
Which of the following statements is a correct 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 does not occur during the Calvin cycle?
Release of oxygen
Which of the following correctly matches a phase of the cell cycle with its description?
G1: follows cell division
Cytochalasin B is a chemical that disrupts microfilament formation. How would this interfere with cell division?
Cleavage
At which phase are centrioles beginning to move apart in animal cells?
Prophase
What is a cleavage furrow?
A groove in the plasma membrane between daughter nuclei
Which of the following is true of benign tumors, but not malignant tumors?
They remain confined to their original site
A research team began a study of a cultured cell line. Their preliminary observations showed them that the cell line did not exhibit either density-dependent inhibition or anchorage dependence. What could they conclude right away?
The cells show characteristics of tumors.
Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely
a plant cell in the process of cytokinesis
Which of the following does not occur during mitosis?
Replication of the DNA