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6 Apr 2018

Which of the following statements is true?

Oxidation is the loss of electrons; reduction is the gain of electrons.

Glucose is eventually reduced by the electrons to form water.

The electrons release large amounts of energy each time they are transferred from one electron acceptor to another

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Collen VonLv2

6 Apr 2018

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Related questions

The combustion of glucose ultimately involves the transfer of electrons to oxygen (O2). In biological systems, this takes place without a large increase in temperature. Which of the following statements about this process in biological systems is true?

1) Coupled oxidation-reduction reactions occur with electrons being passed to intermediate electron carriers.
2) The process involves the transfer of 12 pairs of electrons to oxygen.
3) The transfer of electrons from intermediate electron carriers to molecular oxygen is catalyzed by the electron transport chain.
4) Though the process is a controlled oxidation, some energy is lost.

rubywater-buffalo762

Question 1

Which of the following statements regarding photosynthesis and cellular respiration is true?

	A.	Photosynthesis occurs in mitochondria, and cellular respiration occurs in chloroplasts.
	B.	Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria.
	C.	Photosynthesis occurs in mitochondria and in chloroplasts.

Question 2

How do cells capture the energy released by cellular respiration?

	A.	They produce glucose
	B.	The energy is coupled to oxygen
	C.	They produce ATP

Question 3

During redox reactions

	A.	the loss of electrons from one molecule is called reduction
	B.	electrons are lost from one substance and added to another substance
	C.	protons from one molecule replace the electrons lost from another molecule

Question 4

Oxidation is the ________, and reduction is the ________.

	A.	gain of oxygen; loss of oxygen
	B.	loss of electrons; gain of electrons
	C.	gain of protons; loss of protons

Question 5

During cellular respiration, NADH

	A.	delivers its electron load to the first electron carrier molecule.
	B.	is chemically converted into ATP
	C.	is the final electron acceptor

Question 6

A drug is tested in the laboratory and is found to create holes in both mitochondrial membranes. Scientists suspect that the drug will be harmful to human cells because it will inhibit

	A.	the citric acid cycle only.
	B.	glycolysis only
	C.	the citric acid cycle and oxidative phosphorylation

Question 7

Which of the following metabolic pathways is common in aerobic and anaerobic metabolism?

	A.	glycolysis
	B.	the citric acid cycle
	C.	electron transport chain

Question 8

Which of the following is a result of glycolysis?

	A.	production of CO2
	B.	a net loss of two ATPs per glucose molecule
	C.	conversion of glucose to two three-carbon compounds

Phototrophs need an electron source like H₂S orH₂O. Where do the electrons from these sources go?(Assume the organism is growing autotrophically as well astophototrophically.)

	O₂ and CO₂
	O₂ only
	CO₂ only
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	Inorganic various molecules, depending on cellular needs.

Which of the following statements about chlorophyll istrue?

	It is a good electron acceptor in its oxidized form.
	It is a good electron donor in its reduced form when energizedby light.
	It contains magnesium.
	It is a tetrapyrrole.
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The unifying feature of all photosynthetic organisms isa(n)

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	anaerobic oxidation of soluble ferrous iron,Fe²⁺.
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In addition to their ability to harvest light in the 400 to 500nm range, carotenoids also

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	function as a tetrapyrrole.
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	transfer electrons to ubiquinone.
	raise electrons to a higher energy state.

Ribosomal RNA and other cell features affirm that living cellsshould be divided into three groups called domains.

	True
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Microbes have started to evolve recently.

	True
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The ________ was essential for the evolution of oxygenicphotosynthesis.

	evolution of cyanobacteria
	development of photosystem I
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