Homework answers / question archive / Northern Arizona University BIO 181 TEST1 1)Which of the following are not likely to be found in a biological molecule: a

Northern Arizona University BIO 181 TEST1 1)Which of the following are not likely to be found in a biological molecule: a

Biology

Share With

---

Northern Arizona University

BIO 181

TEST1

1)Which of the following are not likely to be found in a biological molecule:

a.            Oxygen

b.            Hydrogen

c.             Carbon

d.            Helium

e.            Potassium

2.            Which of the following are responsible for holding two separate water molecules together

a.            Hydrogen bonds

b.            Covalent bonds

c.             Polar covalent bonds

d.            Ionic bonds

e.            None of the above

3.            A unique property of water is:

a.            the solid if less dense than the liquid

b.            the gas phase is more dense than the solid

c.             its ability to mix well with both oil and vinegar

d.            the ionic bonds that connect water molecules

e.            its low boiling point

4.            Nickel has atomic number 28. This means that it has

a.            28 neutrons

b.            28 protons

c.             a atomic weight of 56

d.            28 valence electrons

e.            all the above

5.            the type of bond formed when oppositely charged ions, such as Na+ and Cl- are attracted to each other is:

a.            Ionic

b.            Covalent

c.             Polar covalent

d.            Hydrogen

e.            None of the above

6.            two hydrogen atoms held together in a covalent bond share      electrons(s)

a.            2

b.            3

c.             4

d.            5

e.            6

7.            A low pH (2 or less) means that

 

a.            there is a high oxygen concentration

b.            that the solution is basic

c.             there are many hydrogen ions (H+) in solution

d.            there are very few hydrogen bonds

e.            there are few hydrogen ions (H+) in solution

8.            During chemical reactions

a.            the protons of atoms interact

b.            the neutrons of atoms interact

c.             the electrons of atoms interact

d.            all the above

e.            molecules share protons

9.            All isotopes of Carbon contain:

a.            6 protons

b.            6 neutrons

c.             12 protons

d.            12 neutrons

e.            none of the above

10.          the number of valence electrons in Carbon is:

a.            4.

b.            2

c.             12

d.            12 and 13 depending on which isotopes

e.            none of the above

11.          A chlorine (Cl) ion with a -1 charge contains

a.            17 protons and 16 electrons

b.            18 protons and 17 electrons

c.             17 protons and 18 electrons

d.            35 protons and 36 electrons

e.            none of the above

12.          on the periodic table at the back of this exam, Carbon has a molecular weight of 12.011. why does the number include the “.011”?

a.            the atomic weight does not include the weight of the neutrons

b.            the number of electrons in carbon may vary

c.             the number of protons in carbon may vary

d.            the atomic weight does not include the weight of protons

e.            the atomic weight in the periodic table is the average of the mass numbers of all its isotopes.

13.          which type of bond deals with an EQUAL sharing of electrons?

a.            covalent

b.            ionic

 

c.             hydrogen

d.            polar covalent

e.            all the above

14.          the bond between oxygen and hydrogen in a water molecule is:

a.            non-polar

b.            involves sharing 4 electrons

c.             a polar covalent bond

d.            an ionic bond

e.            all of the above

15.          which characteristics of water contributes to the relatively constant temp. of the oceans?

a.            water ionizes only slightly

b.            it takes a small amount of heat energy to raise the temperature of water (low spec. heat)

c.             water can contain a large amount of salf

d.            water has the ability to ionize readily

e.            it takes a large amount of heat energy to raise the temperature of water (high spec. heat)

16.          two atoms have the same # of protons, but different number of neutrons. These atoms are:

a.            isotopes of the same element

b.            different elements

c.             will have different number of electrons

d.            will have different atomic numbers

e.            none of the answers

17.          which component of an atom does not significantly add to the mass of an atom?

a.            proton

b.            neutron

c.             electron

d.            both a and b

e.            a, b and c

18.          of the following atomic configurations, the one that has an atomic mass of 14 is the atom with

a.            14 neutrons

b.            14 protons and 14 neutrons

c.             6 neutrons and 8 electrons

d.            7 protons and 7 electrons

e.            6 protons and 8 neutrons

 

19.          the rough ER us the portions of the ER that

a.            lacks ribosomes

b.            is older and was once the smooth ER

c.             has ribosomes attached to it

d.            is connected to the Golgi apparatus

 

e.            is the site of steroid synthesis

20.          cells in the pancreas manufacture large amounts of protein. Which of these organelles would you expect to find a large amount of in pancreatic cells:

a.            lysosomes

b.            chloroplasts

c.             plasma membrane

d.            peroxisomes

e.            rough endoplasmic reticulum

21.          Rough Endoplasmic reticulum (ER) is distinguished from smooth ER by the presence of

a.            chromatin

b.            ribosomes

c.             lysosomes

d.            microfilaments

e.            chloroplasts

22.          the majority of the DNA of eukaryotic cells is found in the

a.            plasma membrane

b.            nucleus

c.             ribosomes

d.            peroxisomes

e.            mitchondria

23.          which of the following would you expect to find in a prokaryotic cell

a.            golgi appartus

b.            mitochondria

c.             endoplasmic reticulum

d.            nucleus

e.            ribosomes

24.          Digestic enzymes are found in:

a.            photosynthetic pigments

b.            carbohydrates

c.             mitochondria

d.            lysosomes

e.            phospholipids

25.          which of the following are involved in cell shape and support?

a.            cytoskeleton

b.            golgi appartus

c.             endoplasmic reticulum

d.            cytosol

e.            matrix

26.          which of the following statements are true

 

a.            prokaryotic cells do not have a cytoplasm while eukaryotic cells do

b.            unlike eukaryotic cells, prokaryotic cells can not make ATP

c.             prokaryotic cells do not have a nucleus while eukaryotic cells do

d.            prokaryotic cells do not have cell membranes while eukaryotic cells do

e.            prokaryotic cells have more mitochondria and Golgi apparatus than eukaryotic cells

27.          in a eukaryotic cell the “powerhouse” of the cell is?

a.            golgi appartus

b.            nucleus

c.             lysosome

d.            endoplamic reticulum

e.            mitochondria

28.          the two major types of cells are

a.            red and white

b.            prokaryotic and eukaryotic

c.             blood and muscle

d.            chloroplast and nucleplasts

e.            cytoplasts and nucleoids

29.          the membrane of the endoplasmic reticulum are continous wih the membrane of the

a.            mitochondria

b.            golgi appartus

c.             lysosomes

d.            plasma membrane

e.            none of the above 30 Chlorophyll is

a.            found in the nucleus of prokaryotic cells but not eukaryotic cells

b.            found in the lysosomnes of prokaryotic and eukaryotic cells

c.             the pigment found in chloroplast

d.            a digestive enzyme

e.            a phosphlipid

31.          Mitochondria have

a.            an inner and outer membrane

b.            a cell wall

c.             chlorophyll

d.            nuclear pores

e.            all of the above

 

32.          Many antibiotics work by blocking the function of ribosome. Therefore these antibiotics will:

a.block DNA synthesis

b.            block RNA synthesis

 

c.             block protein synthesis

d.            block sugar synthesis

e.            block fat and lipid synthesis

33.          Which of the following are mechanisms for transporting material into lysosomes?

a.            receptor mediated endocytosis

b.            phagocytosis

c.             autophagy

d.            all the above

e.            none of the above

34.          increasing the number of carbons in the fatty acid chain of a plasma membrane phospholipids will

a. increase membrane fluidity b decrease membrane fluidity

c.             have no effect on membrane fluidity

d.            make the cells more permeable to positive ions

e.            make the cell more permeable to negative ions

35.          For cells to function it is necessary for the plasma membrane to remain fluid. One way to adapt to very cold temp. would be for the plasma membranes:

a.            replace unsaturated fatty acids with saturated fatty acids

b.            to open protein channels

c.             to increase the number of cell surface receptors

d.            to replacing saturated fatty acids with unsaturated fatty acids

e.            to use fatty acids with longer tails

36.          Osmosis moves water from a region of

a.            high concentration of dissolved material to a region of low concentration

b.            low concentration of dissolved material to a region of high concentration

c.             hypertonic solution to a region of hypotonic solution

d.            negative osmotic potential to a region of positive osmotic potential e. low concentration of water to a region of high concentration of water

37.          Active transport usually moves molecules

a.            in the same direction in which diffusion moves them

b.            in the opposite direction from the on in which diffusion moves them c.in a direction that tends to bring about equilibrium

d. towards higher pH

e. towards lower pH

 

 

38.          which of the following processes transports molecules along a concentration gradient (from high concentration to lower concentration)

a.            facilitated diffusion

 

b.            the sodium-potassium pump

c.             active transporters

d.            transporters that require the input of energy (ATP) e. All the above

39.          what do phospholipids and triglycerides have in common?

a.            they both contain serine or some other organic compound

b.            they both have three fatty acids c. they both have glycerol backbone

d. they both have a phosphate

e. neither has any carbon atoms

40.          The Na+, -K+ involves:

a.            transporting Na+ ions against a concentration gradient.

b.            transporting K+ ions against a concentration gradient

c.             consumption of ATP (conversion of ATP to ADP+Pi)

d.            all of their above

e.            none of the above

41.          The interior of the phospholipid bilayer is

a. Hydrophilic b. hydrophobic

c.             aqueous

d.            solid

e.            charged

42.          which of the following are a component of phosphotidylinsositol?

a.            inositol

b.            glycerol

c.             fatty acides

d.            phosphate e. all the above

43.          when a cell is placed in a hypertonic solution, what will happen?

a.            the cell will shrivel

b.            the cell will swell c. the cell will burst

d. the cell will swell, then return to normal.

e. none of the ^

44.          the major components of membranes include:

a.            phosoplipids, carbohydrates and proteins

b.            DNA, RNA, and nucleotides

c.             RNA, sugars, and fats

d.            triglycerides, DNA and proteins

 

e.            all the above

45.          to which of the following, is the lipid bilayer most permeable?

a.            large positively charged ions

b.            small uncharged polar molecules

c.             large uncharged polar molecules

d.            small hydrophobic molecules

e.            small negatively charged ions

46.          which of the following is a transmembrane protein?

 

 

 

 

a.            A

b.            B,

c.             C

d.            All

e.            None

47.          which of the following is a peripheral membrane protein:

A.            A

B.            B C C

D all the above

E. none of the above

48.          the portion of a phospholipid that contains the phosphorous group have one or more electric charge That makes this region of the molecule:

A.            Hydrophobic

B.            Hydrophilic

C.            Nonpolar

D.            Unsaturated

E.            Saturated.

49.          which of the following processes require energy?

a.            passive transport

b.            simple diffusion

 

c.             facilitated diffusion

d.            active transport

e.            choices b, c, d are all correct