BIOB10Y3 Lecture : BIOB10 Lecture 2.docx

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orangeantelope630

15 Apr 2012

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>energy stored in hydrogen atoms (used in mitochondria) Carbs can take many forms: disaccharide, oligosaccharides and polysaccharides. Cell wall is polysaccharides (cellulose) performs a structural role. Nucleic acids: composed of phosphate, sugar and base connected to form polymer. >makes each dna strand and rna strand (rna is single stranded) Rna is ribosome rna, transfer rna (brings in amino acids) and messenger rna (rna transcript from gene) Gtp hydrolysis to gdp and pi also releases energy. Lipids are arranged in a bilayer with hydrophobic portions on interior. Human genome project: predicts about 30000 proteins are manufactured from genes.

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Can somebody check if my answer is rght? Thank you

Complex carbohydrates

Indicate whether each of the following statements about polysaccharides is True or False.

1. Polysaccharides are long polymers made of many nucleotides that have been joined through dehydration synthesis. False
2. Cellulose is the main storage polysaccharide in plants while glycogen is an important storage polysaccharide in many animals. False
3. Both starch and glycogen are composed of Î±-glucose subunits. True
4. Starch is composed of amylose and amylopectin, which are unbranched and branched chains of Î±-glucose subunits, respectively. False
5. Like amylopectin, glycogen is insoluble in water, but it has a longer average chain length and fewer branches. True
6. Although some polysaccharides are used to store energy, others serve as structural material for cells. True
7. The principal structural polysaccharide in plants is starch. True
8. Cellulose is composed of a long, branched chain of Î²-glucose subunits. True
9. The starch-hydrolyzing enzymes produced by most organisms cannot break the bond between two Î± -glucose subunits because they only recognize Î² linkages. False
10. Chitin is a structural polysaccharide found in the exoskeleton of arthropods and the cell wall of many fungi. True

1.) What is the endosymbiont theory? Does it still happen in the world today?

2.) What do you mean by the "RNA World Hypothesis"?

3.) Starch, cellulose, and glycogen are all polysaccharides composed of glucose. What makes each of these polysaccharides unique in spite of the fact that all are composed solely of glucose?

1) What is the difference between maltose and amylose (starch)?
Select one:
a. Maltose is joined by 1-4 glycosidic linkages, while amylose is joined by 1-6 glycosidic linkages.
b. Maltose is made of glucose in the alpha form, while amylose is made of glucose in the beta form.
c. Maltose is composed of glucose monomers, while amylose is composed of fructose monomers.
d. Maltose is a disaccharide, while amylose is a polysaccharide.
2) What does the â1-4â in â1-4 glycosidic linkageâ mean?
Select one:
a. Each branch of the chain is followed by four monosaccharides.
b. A one-carbon monosaccharide is connected to a four-carbon monosaccharide.
c. The first carbon on one monosaccharide is connected to the fourth carbon on the next monosaccharide.
d. Each monosaccharide is connected to four other monosaccharides.

What is the difference between the sugar group in DNA and the sugar group in RNA?

Select one:

a. The sugar group in DNA is a hexose, while the sugar group in RNA is a pentose.

b. The sugar group in DNA has one less hydroxyl group (âOH) than the sugar group in RNA.

c. The sugar group in DNA is a purine, while the sugar group in RNA is a pyrimidine.

d. The sugar group in DNA contains one less carbonyl group (double-bonded oxygen atom) than the sugar group in RNA.

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BIOB10Y3 Lecture : BIOB10 Lecture 2.docx

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