BIOL 1201 : Exam 1

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azuremammoth471

15 Mar 2019

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Week 1 learning objectives: differentiate between protons, neutrons and electrons, atomic number and atomic mass, and how isotopes relate to these topics. Subatomic particles organization: k shell- inner shell, can hold 2 electrons, l shell- middle shell, can hold 8 electrons, m shell- outer shell, can hold 8 electrons. Week 2 learning objectives: differentiate between the different types of strong chemical bonds, and understand when each might occur and their strength in aqueous solutions. Bloom 4: ionic bonds form when atoms completely gain or lose electrons and are strongest when dry, covalent bonds form when atoms share electrons. If shared equally, they"re covalent, and if shared unequally, they"re polar covalent. They are strongest in water: use electronegativity data to determine bond type. Bloom 1: weak attractions between atoms on different molecules or different parts of a large molecule, occur between molecules that have polar covalent to ionic bonds, always involve hydrogen, hydrogen holds proteins together, and stabilizes proteins.

Related Questions

1. An ionic bond between two atoms is formed as a result of the ______________.

a) sharing of electrons

b)transfer of electrons from one atom to the other.

c) loss of electrons from both atoms.

d) loss of a proton from one atom

2. Choose the phrase that best completes this sentence: Microtubules ____________ and are required to pull duplicated chromosomes to opposite poles of dividing cells.

a)generate contractile forces

b)are intermediate in thickness

c)are found in especially large numbers in muscle cells

d)can rapidly reorganize

3. Which subatomic particles contribute to the atomic number for any given element?

a)protons

b)neutrons

c)protons and electrons

d)protons and neutrons

ATOMIC STRUCTURE

1. A neutral oxygen atom (atomic number = 8) has 8 electronslocated in 2 different electron orbitals. TrueFalse

2. Hydrogen has only one neutron and no protons in itsnucleus. TrueFalse
3. An atom consists of a central nucleus surrounded by electronsthat are in constant motion. TrueFalse
4. Almost all of the mass of an atom is concentrated in itselectrons. TrueFalse
5. The orbital of an electron is the volume of space where theelectron is most likely to be found. TrueFalse
6. Almost all of the volume of an atom is emptyspace. TrueFalse
7. The reactivity or chemical behavior of an atom depends primarilyon the number of neutrons it has. TrueFalse
8. Modern physics indicates that we cannot determine the exactlocation of a particular electron at any giventime. TrueFalse
9. Electrons are maintained in their orbitals by their attractionto the positively charged nucleus. TrueFalse
10. Atomic orbitals represent probability distributions forelectrons and come in a variety of shapes. TrueFalse

aquamarineoyster686

2. Inductive reasoning in science:

a) is often part of the discovery process

b) proceeds from specific observations to general conclusions

c) is complementary to deductive reasoning

d) often relies on descriptive science

e) all of the above

3. A proton is a subatomic particle with:

a) a negative charge and an atomic mass of 1

b) a negative charge and a negligible mass

c) a positive charge and an atomic mass of 1

d) no charge and an atomic mass of 1

e) no charge and a negligible mass

4. Nonpolar covalent bonds are formed when:

a) electrons are shared equally by atoms

b) electrons are shared unequally by atoms

c) electrons are transferred completely from one atom to another

d) two atoms both lose electrons

e) a negative pole of one atom is attracted to a positive pole of another atom

5. Hydrogen bonds are formed when:

a) electrons are shared equally by atoms

b) electrons are shared unequally by atoms

c) electrons are transferred completely from one atom to another

d) two atoms both lose electrons

e) a negative end of one molecule is attracted to a positive end of another molecule

6. Compared with a solution of pH = 4, a solution with pH = 6 is:

a) 2 times less acidic

b) 10 times more acidic

c) 100 times more acidic

d) 10 times less acidic

e) 100 times less acidic

7. Nucleotides are formed from:

a) 3 fatty acids and a glycerol

b) 3 monosaccharides and a glycerol

c) a fatty acid, a pentose sugar, and 1 or more phosphate groups

d) a nitrogenous base, a pentose sugar, and 1 or more phosphate groups

e) an amino acid, a pentose sugar, and 1 or more phosphate groups

8. Which nucleotide base is found in RNA, but not in DNA?

a) adenine

b) cytosine

c) guanine

d) thymine

e) uracil

9. The correct sequence for the levels in the taxonomic hierarchy is:

a) domain â class â order â kingdom â phylum â genus â family â species

b) kingdom â domain â class â phylum â order â family â genus â species

c) domain â kingdom â phylum â class â order â family â genus â species

d) domain â kingdom â phylum â class â order â genus â family â species

e) phylum â kingdom â domain â order â class â genus â family â species

10. The outer (valence) shell of an atom can hold a maximum of:

a) 4 electrons

b) 6 electrons

c) 8 electrons

d) 12 electrons

e) 18 electrons

11. Which of the following is not true of lipids?

a) they are a diverse group of biological molecules

b) they are hydrophobic

c) they are less oxidized than carbohydrates

d) they are strongly polar

e) they can store more energy than carbohydrates

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BIOL 1201 : Exam 1

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