BIO 282 Exam 1

Atoms A and B interact to form a compound, AB2. When measured, atom A has a partial negative charge and atom B has a partial positive charge. From this information, we can conclude what? Select only ONE answer choice. Note: ~ means "approximately equal to", A > B means "A is greater than B", and A < B means "A is less than B" - The electronegativity of A~B: AB2 is hydrophobic - The electronegativity of A~B: AB2 is hydrophilic - The electronegativity of A< B: AB2 is hydrophilic - The electronegativity of A > B: AB2 is hydrophilic - Not enough information to answer the question

The electronegativity of A > B: AB2 is hydrophilic

The globular protein (below) is an enzyme that normally functions in regions of the body with high concentrations of lipids in the fluid surrounding the enzyme. True or False: The exterior of the protein likely consists of amino acids that are polar or charged.

false

The figure below depicts 2 unknown molecules being surrounded by, but not interacting with, water molecules. Based on the patterns seen in the image, the unknown molecules are most likely ______________. - polar - non-polar - negatively charged - positively charged

non-polar

You are given four test tubes containing purified biological macromolecules. The test tubes are unlabeled except for a number between 1 and 4. You are told that one test tube contains a protein, one contains a lipid, one contains a carbohydrate, and one contains a nucleic acid. You then perform some tests on the macromolecules and collect the following information: Test tubes #2 and #4 contain nitrogen, but the other tubes do not. Soluble in water: #1,2,4 Not soluble in water: #3 The contents of test tube #1 can be broken down into identical subunits The macromolecule in test tube #2 is found to have a globular shape. What is the identity of the macromolecule present in Test tube 4? Select only ONE answer choice. - protein - lipid - nucleic acid - carbohydrate

nucleic acid

What are A and B in the table below? - A = polysaccharide and B = amino acid - A = lipid and B = nucleotide - A = polysaccharide and B = nucleotide - A = lipid and B = fatty acid - None of the above

A = polysaccharide and B = nucleotide

Which of the following molecule(s) is/are classified as a lipid? Select ALL that apply. - 2 - 6 - 9 - 10 - 14

6 14

Use the figure below to answer questions 9 - 10. Which of the following molecules consists of multiple (two or more) monosaccharides covalently bonded together? - 9 - 10 - 6 - 11 - none of the above

11

Examine the molecule of testosterone below. How many carbon atoms are present? - 17 - 19 - 23 - 25

19

Examine the molecule of testosterone below. How many TOTAL hydrogen atoms are present? - 22 - 23 - 27 - 28

28

Determine the types of bonds in this molecule. A) non-polar covalent, B) non-polar covalent, C) non-polar covalent A) non-polar covalent, B) polar covalent, C) non-polar covalent A) non-polar covalent, B) polar covalent, C) polar covalent A) polar covalent, B) polar covalent, C) non-polar covalent A) polar covalent, B) non-polar covalent, C) polar covalent

A) non-polar covalent, B) polar covalent, C) non-polar covalent

Which one of these images represents a covalent bond between 2 amino acids? - A - B - C - D - E

B

A model of the molecule of propanol (center in red) and some of its potential interactions with water is shown below. Identify which, if any, of the interactions (indicated by the dashed lines, Labeled A through D) are NOT consistent with our understanding of hydration via hydrogen bonds. Select only ONE answer choice. A B C D All interactions are correct

C

Which of the following options most accurately describe C and D in the table? - C = catalyze reactions and D = phospholipid - C = energy storage and D = glucose - C = information storage and D = enzyme - C = membrane transport and D = DNA - None of the above

C = catalyze reactions and D = phospholipid

You are hiking through the forest and encounter a substance you have never seen before. You notice that it dissolves in water readily. You scoop up a sample of the substance and analyze it when you get back to your lab. You learn that it is composed entirely of carbon, hydrogen, and oxygen atoms. Which of the four categories of biomolecules below best describes this new substance? - proteins - carbohydrates - nucleic acids - fatty acids - the results are inconclusive

Carbohydrates

Mia is studying a slimy protein discharge used by earthworms to ward off predators and pathogens. When added to pure water, the protein increases pH and does not dissolve easily (relatively hydrophobic). The protein appears to be rich in one of the following R-groups. Which would contribute most to the properties Mia has tested so far? Select only ONE answer choice. A B C D E

D

KCl will dissociate into K+ and Cl- ions in water. Which ion (A or B) represents the K+ ion? - Ion A - Ion B

Ion A

Identify the components of the molecule shown below. Select only ONE answer choice. X is a lipid, Y is a nucleotide X is a nucleotide, Y is a lipid X is an amino acid, Y is a carbohydrate X is a carbohydrate, Y is a lipid X is a lipid, Y is an amino acid

X is a carbohydrate, Y is a lipid