K101 Final Exam Practice Unit 1 Flashcards
(15 cards)
Ch 4: In a single molecule of water, the two hydrogen atoms are bonded to a single oxygen atom by:
A. polar covalent bonds
B. ionic bonds
C. hydrogen bonds
D. non polar covalent bonds
A. polar covalent bonds
Ch 4: Stanley Miller’s 1953 experiments demonstrated conclusively that
A. life arose on earth from simple organic molecules, with energy from lighting and volcanoes
B. the conditions on early Earth were conducive to the origin of life
C. life arose on Earth 3.8 billion years ago from simple organic molecules
D. organic molecules can be synthesized abiotically under conditions that may have existed on early Earth
D. organic molecules can be synthesized abiotically under conditions that may have existed on early Earth
Ch 4: What do the four ‘elements of life’ C, O, H, and N- have in common?
A. they are equal in electronegativity
B. they are elements produced only by living cells
C. they all have the same number of valence electrons
D. each element exists in only one isotopic form
E. they all have unpaired electrons in their valence shells
E. they all have unpaired electrons in their valence shells
Ch 4: Water is able to form hydrogen bonds because
A. the oxygen atom in a water molecule has a weak positive charge
B. each of the hydrogen atoms in a water molecule is weakly negative in charge
C. oxygen has a valence of 2
D. the water molecule is shaped like a tetrahedron
E. the bonds that hold together the atoms in a water molecule are polar covalent bonds
E. the bonds that hold together the atoms in a water molecule are polar covalent bonds
Ch 4: Which functional group is an acidic functional group that can release H+ into a solution
A. OH
B. C=O
C. COOH
D. NH2
E. SH
C. COOH
Ch 4: Which functional group is a basic functional group that can accept a H+?
A. OH
B. C=O
C. COOH
D. NH2
E. SH
D. NH2
Ch 4: Which functional group can exist as a ketone or aldehyde configuration?
A. OH
B. C=O
C. COOH
D. NH2
E. SH
B. C=O
Ch 4: Which functional group helps stabilize proteins by forming covalent cross-links within or between protein molecules?
A. OH
B. C=O
C. COOH
D. NH2
E. SH
E. SH
Ch 5: Which modifications of fatty acids will best keep triglycerides solid at warmer temperatures?
A. adding hydrogens and trans double bonds to the fatty acids
B. adding cis double bonds and trans double bonds to the fatty acids
C. creating cis double bonds to the fatty acids
D. adding hydrogens to the fatty acids
E. creating trans double bonds to the fatty acids
A. adding hydrogens and trans double bonds to the fatty acids
Ch 5: A comparison of saturated and naturally occurring unsaturated fats reveals that the unsaturated fats are __________ at room temperature and have _______:
A. Solids; cis double bonds
B. Liquids; trans double bonds
C. Liquids; single bonds
D. Liquids; cis double bonds
E. Solids; single bonds
D. Liquids; cis double bonds
Ch 5: A molecule with four joined rings that is the precursor of vertebrate sex hormones and is also found in the vertebrate phospholipid bilayer is:
A. estrogen
B. testosterone
C. glycerol
D. cholesterol
E. a phospholipid
D. cholesterol
Ch 5: A bond that forms after joining monomers (such as nucleotides or amino acids) into polymers (such as DNA or insulin) is a(n):
A. Hydrogen bond
B. Ionic bond
C. Peptide bond
D. van der Waals interaction
E. Covalent bond
C. peptide bond
Ch 5: When a dry glucose molecule is placed in water, which two functional groups interact to form the ring structure?
A. carboxyl (-COOH) and hydroxyl (-OH)
B. carbonyl (-C=O) and carboxyl (-COOH)
C. hydroxyl (-OH) and hydroxyl (-OH)
D. carbonyl (-C=O) and hydroxyl (-OH)
E. amino (-NH2) and hydroxyl (-OH)
D. carbonyl (-C=O) and hydroxyl (-OH)
Ch 5: Polysaccharides, triacylglycerides, and proteins are similar in that they
A. are synthesized from monomers by the process of hydrolysis.
B. are decomposed into their subunits by dehydration reactions.
C. all contain nitrogen in their monomer building blocks.
D. are synthesized from subunits by dehydration reactions.
E. are synthesized as a result of peptide bond formation between monomers.
D. are synthesized from subunits by dehydration reactions.
Ch 5: A molecule with the formula C18H36O2 is probably a ____ where one with the formula C6H12O6 is probably a ___
A. carbohydrate and fatty acid, respectively
B. fatty acid and monosaccharide, respectively
C. protein and monosaccharide, respectively.
D. nucleic acid and fatty acid, respectively.
E. fatty acid and nucleotide, respectively
B. fatty acid and monosaccharide, respectively
