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Test your knowledge of key concepts in preparation for your test.

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OKAFOR, PETER

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practice testVersion en ligne Test your knowledge of key concepts in preparation for your test. par OKAFOR, PETER 1 This structure of proteins is determined by interactions between R groups. Select all that applies Choose one or more answers a primary structure b secondary structure c tertiary structure d quaternary structure 2 Which of the following is a secondary structure of proteins Choose one or more answers a Alpha helix b nucleic acids c tertiary d quaternary 3 A strong covalent bond formed between two S atoms of the sulfhydryl functional groups a hydrophobic interaction b disulfide bridge c ester bond d glycosidic linkage 4 Goiter is the abnormal enlargement of the thyroid gland from a deficiency in what trace element? a oxygen b Nitrogen c Iodine d Zinc 5 What is the name of the bond that connects two nucleic acid chains in DNA? a phosphodiester bond b covalent bonds c hydrogen bonds d hydrophobic interactions 6 (True or false)? Phosphodiester bonds hold polynucleotide chains together. a False. b True. 7 Which of the following does not apply to purines? a They are nitrogenous bases b they are double ring carbon structures c adenine and thymine d 6 ring carbon fused to 5 ring carbon ring 8 What is a pyrimidine? a A six ringed carbon nitrogenous base b A five ringed carbon pentose sugar c A type of amino acid d two bonded nitrogenous bases 9 Which of the following is considered a purine? a guanine b uracil c thymine d cytosine 10 What is the function of an enzymatic protein? Choose one or more answers a to increase the activation energy of a reaction b to catalyze reactions c reduce the likely hood of a reaction d all of the above 11 How many amino acids are there? Choose one or more answers a 10 b 30 c 26 d 20 12 Which of the following functional groups are present in amino acids? Choose one or more answers a carboxyl b methyl c amine d sulfhydryl 13 If an oxygen atom has a -1 charge with an atomic number of 8, how many electrons does it have? Choose one or more answers a 8 b 9 c 16 d 1 14 What are isotopes? a Two elements with opposite charges b Two elements with the same molecular formula but different molecular structures c Two atoms of the same element with a different number of neutrons d Two atoms of the same element with a different number of electrons 15 True or False: The hydrogen bonding of water is an intramolecular force. a True b False 16 Which of the following is the proper definition of a hydrogen bond. a An intermolecular attraction of hydrogen to an electronegative atom covalently bonded to hydrogen on another molecule b A hydrogen covalently bonded to an electronegative atom c Any bond involved with a hydrogen atom d A hydrogen bond ionically bonded to a non metal 17 Which of the following is strongest? a hydrophobic interactions b hydrogen bonds and vander wahls forces c ionic and covalent bonds 18 Which of the following describes surface tension? a The breaking of hydrogen bonds on the surface of a layer of water b The tension caused by the cohesion of water due to hydrogen bonds c A very thin strong "skin" caused by the Van der Waal's forces of water d The movement of water caused by diffusion 19 What property of water makes it good at stabilizing temperature? Select all that apply. Choose one or more answers a High specific heat capacity b adhesion c "Universal solvent" d hydrogen bonds 20 Which of the following bonds is the strongest a polar - covalent bond b non - polar covalent bond c hydrogen bond d hydrophobic interactions 21 Which functional group increases the acidity of substances the most? a hydroxyl b sulfhydryl c carboxyl d carbonyl 22 Which of the following describes enantiomers? a atoms of the same element with differing amounts of neutrons b Geometric stereoisomers with similar groups on opposing sides of a double bond or ring structure. c Geometric stereoisomer with similar groups on the same side of a double bond or ring structure. d Isomers that are mirror images of each other 23 Which of the following functional groups will absorb H+ from a surrounding solution a -NH2 b OH c CH3 d PO4 -3 24 Polysaccharides are considered the polymers of what macromolecule? a carbohydrates b lipids c proteins d Nucleic acids 25 What is the name of the covalent bond between two monosaccharides? Choose one or more answers a Ester bond b disulfide bridge c glycosidic linkage d peptide bond 26 What is the name of the covalent bond between glycerol and fatty acids in triglycerides? a hydrogen bonds b Ester linkage c glycosidic linkage d phosphodiester bonds 27 (True or False) Because fructose has a carbonyl group attached to the end of the carbon chain, it is a ketose. a False. a ketose has a ketone functional group meaning the carbonyl group will be attached to the middle of the carbon chain. b True. a Ketose has a carbonyl functional group attached to the end of the carbon chain/ring. 28 Which of the following is NOT a part of a nucleotide? a Phosphate group b pentose sugar c Nitrogenous base d R group 29 Which of the following can humans NOT break down? a glucose b Cellulose c lactose d sucrose 30 Which of the following states the difference between saturated and unsaturated fats? Select all that apply Choose one or more answers a Saturated fats have a double bond in their carbon chain b Unsaturated fats are liquid at room temperature c saturated fats are healthier for you d Unsaturated fats have a kink in their carbon chain

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practice testVersion en ligne

par OKAFOR, PETER

This structure of proteins is determined by interactions between R groups. Select all that applies

Which of the following is a secondary structure of proteins

A strong covalent bond formed between two S atoms of the sulfhydryl functional groups

Goiter is the abnormal enlargement of the thyroid gland from a deficiency in what trace element?

What is the name of the bond that connects two nucleic acid chains in DNA?

(True or false)? Phosphodiester bonds hold polynucleotide chains together.

Which of the following does not apply to purines?

What is a pyrimidine?

Which of the following is considered a purine?

What is the function of an enzymatic protein?

How many amino acids are there?

Which of the following functional groups are present in amino acids?

If an oxygen atom has a -1 charge with an atomic number of 8, how many electrons does it have?

What are isotopes?

True or False: The hydrogen bonding of water is an intramolecular force.

Which of the following is the proper definition of a hydrogen bond.

Which of the following is strongest?

Which of the following describes surface tension?

What property of water makes it good at stabilizing temperature? Select all that apply.

Which of the following bonds is the strongest

Which functional group increases the acidity of substances the most?

Which of the following describes enantiomers?

Which of the following functional groups will absorb H+ from a surrounding solution

Polysaccharides are considered the polymers of what macromolecule?

What is the name of the covalent bond between two monosaccharides?

What is the name of the covalent bond between glycerol and fatty acids in triglycerides?

(True or False) Because fructose has a carbonyl group attached to the end of the carbon chain, it is a ketose.

Which of the following is NOT a part of a nucleotide?

Which of the following can humans NOT break down?

Which of the following states the difference between saturated and unsaturated fats? Select all that apply