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Week 2 HW Questions
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Preguntas del test (58)
1An electron in an atom will have a higher energy level when it is
- Acloser to the atom's nucleus
- Bnot paired with another electron
- Cpaired with another electron
- Dfurther from the atom's nucleus
2Select all that apply. Nitrogen is more electronegative than
- Ahydrogen
- Boxygen
- Ccarbon
3Nitrogen is more electronegative than:
- Acarbon, hydrogen, and oxygen.
- Bhydrogen but not carbon or oxygen.
- Ccarbon and hydrogen, but not oxygen.
- Doxygen, but not carbon or hydrogen
4the electronegativity of a carbon atom is most similar to that of a(n):
- Aoxygen atom
- Bhydrogen atom
- Cnitrogen atom
5How can you determine that atomic mass of an atom?
- ASubtract the number of electrons from the number of protons.
- BAdd up the number of protons, electrons, and neutrons.
- CAdd up the number of protons and electrons.
- DAdd up the number of protons and neutrons
6A sodium atom (Na) contains 11 protons and 11 electrons. When sodium becomes an ion (Na+) , it has a charge of +1. Which of the following statements are correct? Select all that apply.
- AA sodium ion (Na+) has 12 electrons.
- BA sodium ion (Na+) is called a cation.
- CA sodium ion (Na+) has 11 electrons.
- DA sodium ion (Na+) and an uncharged sodium atom (Na) are isotopes
- EA sodium ion (Na+) has 10 electrons.
- FA sodium ion (Na+) is called an anion.
7In a water molecule (H2O), the oxygen atom
- Acarries a partial negative charge
- Bcarries a full positive charge
- Ccarries a partial positive charge
- Dcarries a full negative charge
- Eis uncharged
8Within a single water molecule (H2O), the chemical bond between one of the hydrogen atoms and the oxygen atom is a(n)
- Anonpolar covalent bond
- Bhydrogen bond
- Cionic bond
- Dpolar covalent bond
9This figure shows an atom of helium. Which of the following is true for this atom?
- AAtomic mass = 4; atomic number = 4; net charge = 0
- BAtomic mass = 4; atomic number = 2; net charge = +2
- CAtomic mass = 6; atomic number = 2; net charge = +1
- DAtomic mass = 6; atomic number = 2; net charge = 0
- EAtomic mass = 4; atomic number = 2; net charge = 0
10Which of the following statements are correct about a chemical bond between an oxygen atom and a hydrogen atom? Select all that apply.
- AThe electrons are equally shared by the oxygen and hydrogen atoms.
- BThe oxygen atom carries a partial negative charge.
- CThe electrons are more strongly attracted to hydrogen than to oxygen.
- DThe electrons are more strongly attracted to oxygen than to hydrogen.
- EThe hydrogen atom carries a partial negative charge.
11Check all that apply. An oxygen atom has 8 protons and 8 neutrons. This means that
- Aoxygen has 8 electrons
- Bthe atomic number of oxygen is 8
- Cthe atomic mass of oxygen is 8
- Dthe atomic mass of oxygen is 16
- Eoxygen has 16 electrons
- Fthe atomic number of oxygen is 16
12When is an atom most stable?
- AWhen it does not carry an electrical charge
- BWhen it has the same number of protons and neutrons
- CWhen its outermost energy shell is completely filled with electrons
- DWhen it has the fewest possible number of valence electrons
13The most common form of hydrogen has 1 proton and no neutrons. Deuterium is an isotope of hydrogen that has 1 proton and 1 neutron. Does the presence of a neutron make deuterium more or less chemically reactive (that is, more or less likely to form a chemical bond with another atom) than a typical hydrogen atom, which does not have any neutrons?
- ANo, deuterium and a typical hydrogen atom have the same chemical reactivity.
- BYes, deuterium is less chemically reactive than a typical hydrogen atom.
- CYes, deuterium is more chemically reactive than a typical hydrogen atom.
14An atom with 7 electrons in its valence shell can become more stable by
- Againing 7 electrons
- Blosing 3 electrons
- Cgaining 1 electron
- Dlosing 1 electron
15What functional group is circled in the chemical structure shown below?
- ACarboxyl group
- BAmino group
- CCarbonyl group
- Dhydroxyl group
- EMethyl group
16Amino acids are:
- Athe subunits of DNA and RNA
- Bpolymers of simple sugars
- Cthe subunits of proteins, DNA, and RNA
- Dthe subunits of proteins
17The monomers that make up DNA and RNA are collectively called:
- Anucleotides
- Bmonosaccharides
- Cproteins
- Damino acids
18In a double bond between two carbon atoms, the atoms are sharing a total of ______ electrons.
- A12
- B2
- C8
- D4
19Which functional group is represented by the chemical formula - CH3?
- AMethyl group
- BCarbonyl group
- CAmino group
- DHydroxyl group
- ECarboxyl group
20What type of molecule is shown?
- AAmino Acid
- BProtein
- CLipid
- DGlucose
- ENucleotide
21A long chain of simple sugar is called a:
- ANucleic Acid
- BLipid
- CPolysaccharide
- DProtein
22What functional group is circled in the chemical structure shown below?
- AAmino group
- BCarboxyl group
- CHydroxyl group
- DCarbonyl group
- EMethyl group
23Select all that apply. Which of the following molecules are NOT monomers?
- ADNA
- Bglucose
- CProtein
- Dnucleic acid
- Eamino acid
- Fstarch
- Gnucleotide
24In water, an amino group tends to ______ a proton, which causes it to become ______ charged.
- Again; negatively
- Blose; negatively
- Cgain; positively
- Dlose; positively
25Which of the following is NOT a polymer?
- Aa protein
- Ba nucleic acid, such as DNA
- Cpolysaccharide
- Damino acid
- Eall of these are polymers
26When a phosphate group is placed in water, it loses two protons (H+), which makes the phosphate group ______ charged and ______.
- Anegatively; basic
- Bpositively; acidic
- Cpositively; basic
- Dnegatively; acidic
27Which of the following chemical bonds are nonpolar? Select all that apply.
- AC-C
- BC-H
- CC-N
- DC-O
28In the chemical structure shown below, the hydrogen atom that is circled could form a(n)
- Aionic bond with a water molecule.
- Bhydrogen bond with a hydrogen atom in a water molecule.
- Ccovalent bond with a water molecule.
- Dhydrogen bond with an oxygen atom in a water molecule.
29Based on the diagram of the electron shell configuration shown here, the sodium ion (Na+) has _______ protons in its nucleus and has _______ electrons in its outermost (valence) shell.
- A11; 0
- B11; 8
- C10; 0
- D10; 8
30Which diagram (A–E) depicts the correct distribution of charge and hydrogen bonding between two water molecules?
- AA
- BB
- CC
- DD
- EE
31Why do scientists refer to evolution by natural selection as a theory?
- ABecause there is little or no evidence that this explanation is true.
- BBecause this explanation is supported by a large body of evidence.
- CBecause evolution by natural selection cannot be proven by an experiment.
- DBecause scientists disagree about whether this explanation is true.
32Vinegar is an acidic solution of acetic acid. Which of the following statements are correct? Select all that apply.
- AVinegar has a pH greater than 7.
- BA vinegar solution has a higher concentration of free H+ than pure water does.
- CVinegar has a pH less than 7.
- DAcetic acid tends to bind to free protons (H+) when it is in solution.
- EAcetic acid tends to dissociate and release free protons (H+) when it is in solution.
- FA vinegar solution has a lower concentration of free H+ than pure water does.
33Based on the structure and chemical properties of its side chain, the amino acid shown below should be classified as
- Apolar and hydrophilic
- Bnonpolar and hydrophilic
- Cnonpolar and hydrophobic
- Dpolar and hydrophobic
34Which of the numbered carbon atoms in the polypeptide chain below is/are participating in peptide bonds? Select all that apply.
- A#1
- B#2
- C#3
35The tertiary structure of a protein refers to the
- Aunique 3D folding of the molecule
- Binteractions among distinct polypeptides
- Cpresence of alpha helices or beta sheets
- Dinteraction of a protein with water
- Esequence of amino acids
36The sequence of atoms that make up the backbone of a polypeptide, in the correct orientation, can be represented as
- AN-C-O-N-C-O-(...)-N-C-O
- BC-N-C-N-C-N-(...)-C-N
- CN-C-C-N-C-C-(...)-N-C-C
- DC-C-N-C-C-C-(...)-C-C-N
- EN-C-N-C-N-C-(...)-N-C
37When a water molecule interacts with another water molecule, the bond that forms between the two molecules is a(n)
- Ahydrogen bond
- Bpolar covalent bond
- Cnonpolar covalent bond
- Dionic bond
38In double-stranded DNA, the amount of cytosine is always equal to the amount of
- Aguanine
- Bthymine
- Ccytosine
- Dadenine
39A phosphodiester bond is a covalent bond that forms between
- Atwo nitrogenous bases
- Ba hydroxyl group and a phosphate group
- Ctwo phosphate groups
- Da phosphate group and an amino acid
40The backbone of a DNA strand is made of:
- Aamino acids
- Bsugars and phosphates
- Csugars only
- Dnitrogenous bases
- Ephosphate groups only
41Two adjacent nucleotides in a single DNA strand are held together by
- Aa nitrogenous base
- Btwo or three hydrogen bonds
- Ca covalent bond involving a phosphate
- Da glycosidic bond between the sugars
42In a eukaryotic cell, DNA is packaged with histone proteins to form a complex called
- Anucleic acid
- Bchromati
- Ca double helix
- Dcytoplasm
43The genetic information that is stored in DNA is used to direct the synthesis of
- Athe plasma membrane
- Bpolysaccharides
- Clipids
- DRNA and proteins
44In a deoxyribonucleotide, the 2' carbon of the sugar molecule is linked to
- Aa hydroxyl group
- Ba phosphate group
- Ca nitrogenous base
- Danother sugar molecule
- Enone of the above
45The monomers that make up a strand of DNA are called
- Anucleic acids
- Bmonosaccharides
- Camino acids
- Dnucleotides
46The 5-Carbon sugar found in the nucleotides that make up DNA is called
- AGlucose
- BAdenine
- CDeoxyribose
- DRibose
- EThymine
47The molecule that is shown here is an example of a(n)
- Apyrimidine
- Bnucleotide
- Cpentose sugar
- Damino acid
- Epurine
48The sequence of a DNA strand is
5'-CGAT-3'
Which nucleotide in this strand of DNA has a free phosphate group?- AThymine (T)
- BGuanine (G)
- CAdenine (A)
- DCytosine (C)
49In the DNA sequence
5'-ATGC-3'
the ______ of the adenine (A) nucleotide is connected to the ______ of the thymine (T) nucleotide that follows it.- Anitrogenous base; nitrogenous base
- B5' end; 3' end
- Cnitrogenous base; 5' end
- D3' end; nitrogenous base
- E3' end; 5' end
50The reaction represented here is catalyzed by an enzyme, lactase, which converts lactose, a disaccharide, into two simple sugar molecules (glucose and galactose).
The diagram is missing a component. Which of the following would complete the reaction above?
- AWater should be shown as one of the products.
- BWater should be shown as one of the reactants.
- CThe enzyme should be shown as one of the reactants.
- DThe enzyme should be shown as one of the products.
51The enzyme lactase, in catalyzing the reaction above, is promoting the breaking of a:
- Apeptide bond
- Bhydrogen bond
- Cglycosidic bond
- Dphosphodiester bond
52Which of the arrows is pointing at a peptide bond?
- A1
- B2
- C3
- D4
- E5
53Select all that apply. Chemical interactions that form between the side chains (R groups) of amino acids that are distant from one another in a single polypeptide chain help to stabilize the ________.
- Aprimary structure of the protein
- Btertiary structure of the protein
- Cpeptide bonds between amino acids
- Dsecondary structure of the protein
54If cells were grown on a culture medium containing radioactive sulfur (S), and incorporated the S in their molecules, which of the following macromolecules would become radioactively labeled?
- Anucleic acids
- Bcarbohydrates
- Cproteins
- Dall of these
- Enone of these
55A solution has the following concentration of hydrogen ions: [H+] = 10^(-9). Which of the following is true?
- AThe solution is acidic and has pH = -9
- BThe solution is basic and has pH = 9
- CThe solution is acidic and has pH = 9.
- DThe solution is basic and has pH = -9
56The tertiary structure of a protein is stabilized by the interaction between the side chainsof these two amino acids: Lysine (left) and Aspartic acid (right).
What type of interaction do you think is most likely to form between these two side chains, in the watery cell environment?
- Ahydrophobic ineraction
- Bionic bond
- Ccovalent bond
57Which of the two amino acids above has a side chain that is ionized (charged) in water?
- ABoth of them
- Blysine only
- Caspartic acid only
- Dneither of them
58Which of the two amino acids above has a basic side chain?
- ABoth of them
- BLysine only
- Caspartic acid only
- DNeither of them
Información
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- Biology Test sobre Week 2 HW Questions, creado por Blake Clarke el 05/09/2016.
- Autor
- Blake Clarke
- Idioma
- English
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