short answer Flashcards
Which of the following macromolecules are Nucleic Acids?
a) Carbohydrates
b) Proteins
c) Lipids
d) DNA and RNA
e) Amino acids
D. because nucleic acids are made up of DNA and RNA.
The central dogma of biology is
a. DNA —-> RNA ——> protein
b. DNA ——> RNA ——> protein
c. RNA——> DNA ———> protein
d. RNA——–> Protein. ———> DNA
e. Protein ——–> DNA. ———-> RNA
A. because the central dogma of biology is the flow of genetic information from DNA to RNA to protein.
Which of the following polymers has for monomer a nucleotide?
a) Carbohydrates
b) Proteins
c) Lipids
d) DNA and RNA
e) Amino Acids
D
Which type of bonds holds the DNA nucleotides together within a single strand?
a) Hydrogen bonds
b) Ionic bonds
c) Peptide bonds
d) Covalent bonds
e) No bonds
D. covalent bonds because A covalent bond is stronger than a hydrogen bond (hydrogen bonds hold pairs of nucleotides together on opposite strands in DNA).
Which type of bonds holds the two strands of DNA double helix together?
a) Hydrogen bonds
b) Ionic bonds
c) Peptide bonds
d) Covalent bonds
e) No bonds
A. hydrogen bonds because it occurs between the two strands and involve a base from one strand with a base from the second in complementary pairing
Which nucleotide base pairs with Guanine in DNA
a) Adenine
b) Thymine
c) Cytosine
d) Uracil
e) Guanine
C. cytosine
which if the following statements regarding Van der Waals interactions is not correct?
a) They occur between nonpolar molecules
b) They occur between polar molecules
c) They are covalent bonds
d) London dispersion forces
e) None of above
c. they are their own bond example van Der Waals bond.
How many strands make up a DNA double Helix?
a) 1 b) 2 c) 3 d) 4 e) 5
D TWO.
If a solid line represents a covalent bond and a dotted line represents Hydrogen bonds, which of the choices shows a hydrogen bond?
a) H−H
b) H3N⋅⋅⋅⋅⋅⋅H−O−H
c) H4C⋅⋅⋅⋅⋅⋅H−F
d) H2O⋅⋅⋅⋅⋅⋅H−CH3
B
Which of the following correctly gives the letter sequence that would replace the numbers 1 - 4, respectively, in the following segment of DNA?
b
A student is attempting to draw several resonance structures for a species. Which of the following is allowed?
a) Change the connectivity of the atoms
b)Move electrons from one location to another
c) both a and b
d) neither a nor b
e) All of above
b. Move electrons from one location to another
Which scientist is most closely associated with showing that DNA base pairing?
a) O. Avery
b) G. Beadle
c) J. Watson
d) E. Charfgatt
e) None of above
D.
What is the pKa of a buffer solution (pH = 5.05) containing 0.2 M CH3COO– and 0.1 M CH3COOH?
a) 4.75 b) 0.2 c) 0.3 d) 4.45 e) 1.58
A. 5.05-log(0.2/0.1)
The substance CH3CH2NH2 is considered
a) a weak acid
b) a weak base
c) a strong acid
d) a strong base
e) a neutral compound
B
Which species is associated with all acids?
a) H3O+
b) OH–
c) H2O
d) none of these
A. All acidic aqueous solutions contain protonated water, known commonly as the hydronium ion (H3O+).
Which species is associated with all bases?
a. H3O+
b. OH–
c. H2O
d. none of these
B.
The species H3O+ can be called which of the following?
a. heavy water
b. hydrogen ion
c. hydronium ion
d. all of these
C hydronium ion.
The species H+ can be called which of the following?
a. hydrogen ion
b. proton
c. either a or b
d. neither a nor b
C
Which of the following can be characterized as a strong acid?
a. CH3NH2
b. HCl
c. CH3COOH
d. NaOH
b
Which of the following can be characterized as a strong base?
a. Ba(OH)2
b. NH3
c. CH3CH2CH2COOH
d. CH3CH2CH2NH2
A
Which of the following is the Brønsted-Lowry definition of a base?
a. a hydroxide ion acceptor
b. a proton donor
c. none of these
d. a proton acceptor
D
which of the following is the conjugate acid of ammonia, NH3?
a. H+
b.H3O+
c. NH2-
d. NH4+
d
which of the following is a diprotic acid?
a. HCl
b. HNO3
C. H2SO4
D. H3PO4
C
Which of the following is the conjugate base of acetic acid, CH3COOH?
a. H3O+
b. CH3COOH2+
c. CH3COO–
d. OH–
c. because the conjugate base will loose a hydrogen
