Proteins: The Building Blocks of Life
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Questions and Answers

Which biomolecule accounts for more than 50% of the dry mass of most cells?

  • Proteins (correct)
  • Nucleic acids
  • Carbohydrates
  • Lipids

What is the classification of proteins based on their solubility and composition?

  • Simple, conjugated, and derived proteins (correct)
  • Fibrous and globular proteins
  • Integral and peripheral proteins
  • Primary, secondary, tertiary, and quaternary proteins

Which type of protein is readily soluble in water, dilute acids, and alkalies, and coagulates by heat?

  • Albumins (correct)
  • Globulins
  • Scleroproteins
  • Histones

Which type of protein yields only amino acids upon hydrolysis?

<p>Simple proteins (B)</p> Signup and view all the answers

What are enzymes?

<p>Proteins that act as biological catalysts (D)</p> Signup and view all the answers

Mitochondria is a double membrane bound organelle found in the cytoplasm of ______ cells.

<p>eukaryotic</p> Signup and view all the answers

The term mitochondria was coined by Carl Benda in ______.

<p>1898</p> Signup and view all the answers

Mitochondria produce enzymes for the metabolic conversion of food to ______.

<p>energy</p> Signup and view all the answers

Mitochondria are responsible for the conversion of nutrients into energy– yielding molecule ATP to fuel the cell's ______.

<p>activities</p> Signup and view all the answers

Aerobic respiration involves: Glycolysis, Krebs cycle, and Electron transport ______.

<p>chain</p> Signup and view all the answers

The closest extant relatives of Bacteria that gave rise to mitochondria are ______.

<p>Rickettsia</p> Signup and view all the answers

Mitochondrial membranes outer membrane relatively ______

<p>permeable</p> Signup and view all the answers

Inner membrane ______ only to those things with specific transporters

<p>permeable</p> Signup and view all the answers

Impermeable to NADH and ______

<p>FADH2</p> Signup and view all the answers

Permeable to ______

<p>pyruvate</p> Signup and view all the answers

Kreb's and β-oxidation in ______

<p>matrix</p> Signup and view all the answers

Possess ribosomes, circular DNA to manufacture their own RNAs and ______

<p>proteins</p> Signup and view all the answers

Mitochondria convert the chemical energy of reduced carbon compounds into ______

<p>ATP</p> Signup and view all the answers

Chloroplasts convert light energy to the energy of reduced carbon ______

<p>compounds</p> Signup and view all the answers

Electrons ultimately reduce oxygen to ______

<p>water</p> Signup and view all the answers

The glycerol phosphate shuttle transfers electrons from NADH to dihydroxyacetone phosphate (DHAP) to form glycerol 3-phosphate, which shuttles them into the ______

<p>mitochondrion</p> Signup and view all the answers

Flashcards

What is the most abundant biomolecule in cells?

Proteins make up more than half of the dry weight in most cells.

How are proteins classified?

Proteins are classified based on their solubility and chemical composition.

What are albumins?

Albumins are readily soluble in water, dilute acids, and bases. They also solidify when heated.

What are simple proteins?

Simple proteins are composed only of amino acids. They don't have any other components.

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What are enzymes?

Enzymes are proteins that act as biological catalysts, speeding up chemical reactions in living organisms.

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What are mitochondria?

Mitochondria are double-membrane bound organelles found in the cytoplasm of eukaryotic cells.

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Who discovered mitochondria?

Carl Benda, a German anatomist, coined the term "mitochondria" in 1898.

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What is the role of mitochondria in energy production?

Mitochondria produce enzymes that convert nutrients into energy in the form of ATP.

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Why are mitochondria called the "powerhouse of the cell"?

Mitochondria are responsible for converting nutrients into ATP, the energy currency of the cell, to fuel cellular activities.

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What are the stages of aerobic respiration?

Aerobic respiration involves three key stages: glycolysis, the Krebs cycle, and the electron transport chain.

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What is the evolutionary origin of mitochondria?

Rickettsia, a genus of bacteria, is thought to be the closest relative of mitochondria.

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What is the permeability of the outer mitochondrial membrane?

The mitochondrial outer membrane is relatively permeable, allowing many molecules to pass through easily.

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What is the permeability of the inner mitochondrial membrane?

The mitochondrial inner membrane is selectively permeable, only allowing specific molecules to pass through with the help of transporters.

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What molecules are impermeable to the inner mitochondrial membrane?

NADH and FADH2, key energy carriers, cannot pass through the inner mitochondrial membrane without specific transporters.

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What molecule is permeable to the inner mitochondrial membrane?

Pyruvate, a key metabolic intermediate, can freely cross the inner mitochondrial membrane.

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Where do the Krebs cycle and β-oxidation occur?

The Krebs cycle and β-oxidation occur within the mitochondrial matrix, the fluid-filled space inside the inner membrane.

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What features make mitochondria semi-autonomous?

Mitochondria contain their own ribosomes and circular DNA, allowing them to produce their own RNA and proteins.

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What is the primary function of mitochondria?

Mitochondria convert the chemical energy stored in reduced carbon compounds into ATP, the energy currency of the cell.

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What is the function of chloroplasts?

Chloroplasts are organelles found in plant cells that convert light energy into the chemical energy of reduced carbon compounds.

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What is the final electron acceptor in aerobic respiration?

Electrons ultimately reduce oxygen to water during the electron transport chain in aerobic respiration.

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What is the glycerol phosphate shuttle?

The glycerol phosphate shuttle transfers electrons from NADH to dihydroxyacetone phosphate (DHAP) to form glycerol 3-phosphate, which then carries them into the mitochondrion.

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