BIOL 115 Lecture 6: BIOL 115 - Lecture 6

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amaranthjackal733

23 Jan 2018

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A polypeptide of three amino acids linked by peptide bonds: Aminoacids came together to form this tripeptide. Valine, alanine, phenylalanine are all hydrophobic (non-polar) Key concepts (no need to memorize amino acid structures) Non-polar amino acids have a hydrocarbon side-chain (e. g. alanine; -ch3) Polar amino acids have side-chains with - partial charge (polar uncharged) Or net (+) charge e. g. lysine -4(ch2)nh3. Or net (-) charge e. g. aspartic acid co2. The shape of the folded protein is encoded in the polypeptide sequence. A major class of molecules that give rise to: The dual properties of phospholipids allow them to form barriers. A steroid is composed of 4 carbon rings. A (adenine) and g (guanine) = purines (bulkier) T (thymine) and c (cytosine) = pyrimidines. Together, give dna the ability to form a double helix, a particular structure, and it means it will form a great number of hydrogen bonds. Dna is a double helix = two strands linked together.

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1. Enzyme A is an enzyme that catalyzes the reaction of glucose + fructose to sucrose by coupling this +âG reaction with the -âG hydrolysis of ATP. A chemical is discovered that keeps Enzyme A from entering its transition state. What will happen when this enzyme is added to a solution containing ATP and equal parts of glucose, fructose, and sucrose?

A. All of the glucose + fructose will be converted to sucrose.

B. All of the sucrose will be converted to glucose + sucrose.

C. The glucose + fructose will reach their equilibrium constant with sucrose.

D. The ATP will phosphorylate the glucose to produce sucrose while leaving fructose.

2.Which of the following does not contribute to how an individual protein functions?

A. sequence of amino acids.

B. The quaternary structure of that protein.

C. The shape of the binding site.

D. The number and position of charged and polar amino acids.

3. In order to perform functions that proteins alone cannot do, proteins can:

A. Incorporate other molecules into their structure.

B. bind to other proteins to form a complex.

C. signal to non-protein enzymes to perform the function.

D. undergo a conformational change to perform the function.

4. Which of the following is not a function of intrinsically disordered sequences in a protein?

	A. Acting as substrates for chemical interactions.
	B. Increasing variation in a protein by swapping amino acids.
	C. Providing elasticity to tissues.
	D. Flexing to enable interactions between domains.

Name the metabolic pathway(s) involved with the cellâs use of carbohydrates other than glucose and amino acids as sources of cellular energy? What is Beta oxidation and how are triglycerides used as a source of energy?

Table sugar (or sucrose, a disaccharide made of the monomersglucose and fructose) is dissolved in water at room temperature. Aresearcher cannot detect smaller components (glucose, fructose, CO2and other fragments) because

A. The sucrose has lessfree energy than its components.
B. Breaking apartsucrose to make CO2 is endergonic.
C. The activation energybarrier cannot be overcome by the sucrose molecules.
D. Tearing apart sucroseto form CO2 is not a spontaneous reaction.

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BIOL 115 Lecture 6: BIOL 115 - Lecture 6

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