Question

11. All of the following are uses of carbohydrates in organisms EXCEPT:

	A.	As a component of cell walls.
	B.	As a long-term energy source.
	C.	As a short-term energy source.
	D.	To keep membranes flexible at low temperatures.
	E.	As a building block of DNA and RNA at low temperatures.

12. Which of the following is an example of a polysaccharide?

	A.	glycogen
	B.	glucose
	C.	fructose
	D.	deoxyribose
	E.	sucrose

13. All of the following are associated with proteins EXCEPT:

	A.	enzymes
	B.	peptide bonds
	C.	pyrimidines
	D.	alpha-helices
	E.	disulfide bridges

14. Hydrogen bonds would be found in all of the following EXCEPT:

	A.	between phosphates
	B.	in alpha-helices
	C.	between water molecules
	D.	in the DNA double helix between nucleotides
	E.	between the R groups of amino acids in proteins

15. All of the following can cause disruptions in the three-dimensional structure of proteins EXCEPT:

	A.	changes in temperature
	B.	amino acid substitutions
	C.	changes in pH
	D.	changes in salt concentration
	E.	changes in fatty acid composition

16. All of the following bases are found in RNA molecules EXCEPT:

	A.	adenine
	B.	thymine
	C.	uracil
	D.	cytosine
	E.	guanine

17. All of the following are associated with the structure of DNA molecules EXCEPT:

	A.	high-energy bonds
	B.	pentose sugars
	C.	antiparallel strands
	D.	hydrogen bonds
	E.	phosphate

18. All of the following are associated with ATP molecules EXCEPT:

	A.	a long term energy supply
	B.	high-energy bonds
	C.	a recyclable energy supply
	D.	used to form coenzymes
	E.	three phosphate groups

19. The side groups of amino acids can interact with each other, and with other molecules.

True

False

20. Hydrogen bonds are weaker than covalent bonds.

True

False

21. Denaturation of protein is always permanent.

True

False

22.Organisms function only within narrow pH ranges.

True

False

23. Molecules that are insoluble in water are often called ___________, which literally means "water-fearing".

	A.	hydrophyllic
	B.	amphitrichous
	C.	ionic
	D.	hydrophobic

24. A(n) __________ is any molecule that speeds up a chemical reaction.

	A.	base
	B.	buffer
	C.	catalyst

25. The sum of all the chemical reactions within an organism is referred to as its ____________.

	A.	catabolism
	B.	anabolism
	C.	enzymatic capacity
	D.	metabolism

Answer 1

All of the following are uses of carbohydrates in organisms EXCEPT

The correct answer is To keep membranes flexible at low temperatures. The molecules that maintain the flexibility of the membrane under low temperatures are the phospholipids, specifically their fatty acid tails.

Which of the following is an example of a polysaccharide?

The correct answer is glycogen. Remember that a polysaccharide is composed by more than two units of glucose. The glycogen is composed by 12 to 18 units of glucose.

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