Download Biology 1406 Dr. Larry E. Brown Practice Test for examination 1 over

Biology 1406
Dr. Larry E. Brown
Practice Test for examination 1 over Chapters 2,3,4,and 5
Choose the one best match.
1. The atomic weight refers to the sum of the number of ______ and ______.
a. neutrons and electrons b. protons and electrons c. neutrons and protons
d. none of these
2. Which side of the water molecule has a negative charge:
a. hydrogen b. oxygen c. no sides d. all sides
3. Atoms of the same element that have different number of neutrons are termed:
a. proton
b. ion
c. isomer d. isotope
4. The number of ______ is the same for all atoms of the same element:
a. protons b. neutrons c. isotopes
d. all of these
5. An atom with more protons than electrons is a/an:
a. anion
b cations c. not possible d. molecule
6. A/an _____ is a subatomic particle which carries a negative charge:
a. proton b. electron c. neutrons
d. ion
7. What type of bond is broken when liquid water changes to water vapor:
a. hydrogen
b. covalent c. ionic
d. nonpolar covalent e. van der Waals
8. The _____ electrons are the electrons in the outer shell that are involved in chemical bonding:
a. valence b. 9
c. ion
d. proton
9. The atomic number refers to the number of_______in an atom:
a. electron b. proton
c. neutron
d. ions
10. Isomers are compounds with different structural formulas but identical_______ formula:
a. molecular
b. isotope
c. covalent
d. ionic
11. An ____ is a substance composed of identical atoms:
a. covalent compound
b. ionic compound
c. hydrogen
d. element
12. Which bond occurs between atoms that do not share electrons equally:
a. ionic
b. non-polar covalent
c. polar covalent
d. hydrogen
13. Unsaturated and saturated refer to which part of a lipid:
a. glycerol b. steroid
c. fatty acids
d. phosphate
14. An ionic bond is formed between a _____ element and _______element
a. non-metal and non-metal
b. metal and metal
c. carbon and hydrogen
15. A substance whose small particles are molecules is a/an:
a. ion
b. element
c. ionic compound
d. covalent compound
16. The symbol 17C135 indicates that this chlorine atom contains:
a. 17 neutrons
b. 18 neutrons
c. 35 neutrons
d. 52 neutrons
17. A tritium atom H3 contains how many neutrons?
a. 0
b. 1
c. 2
d. 3
18. If an atom gains an electron, it becomes:
a. an acid b. an anion c. a proton d. a cation
d. metal and non-metal
19. If the pH of a solution is 12, what is the concentration of hydroxide (0H)- ions in moles per liter:
a. 0.1 b. 0.01 c. 0.001 d. 0.0001.
20. The combination of an acid and base gives a/an________and a/an_______:
a. water and proton b. hydrogen and electron c. electron and neutron d. salt and water
21. Neon (Ne) belongs to group VIIIA, it has how many electrons in the outermost shell?
a.3
b.5
c.7
d. 8
22. A condensation reaction releases a ________ molecule:
a. methane b. hydrogen c. water d. acid e. base
23. The small particles of compounds composed of two or more elements united by a covalent bond are:
a. ions b. cations c. atoms d. molecules e. none of these are correct
24. A substance formed by the combination of two or more kinds of elements (atoms) joined by chemical bonds is known as
a. a molecule
b. a compound c. a mixture d. an isotope
25. The following elements make up 99% of living matter except:
a. hydrogen b. oxygen . c. carbon d. calcium e. nitrogen
26. Which elements form negative ions:
a. group 1 b. group 2 c. group 3
d. group 4
e. group 6
27. Isotopes are the atoms of the same element that have different numbers of:
a. electrons b. protons c. neutrons d. all of the above
28. When magnesium in group 2a combines with iodine in group 7, the formula is:
a. Mg2I b. MgI2
c. MgI
d. Mg7I
29. The monomers of carbohydrates are:
a. polysaccharides b. monosaccharides
c. amino acids
d. nucleotides
30. Which of the following is not a functional group in sugars:
a. carboxyl
b. hydroxyl
c. carbonyl
d. all are present in sugars
31. Which of the following is unique for each amino acid:
a. carboxyl b. amino c. phosphate d. base e. R group
32. The peptide bond forms between the R group and the :
a. carboxyl b. amino c. backbone d. none of these is correct
33. Polypeptide chains are present in:
a. proteins b. carbohydrates c. nucleic acids
e. all are correct
d. phosopholipids only
e. steroids only
34. A chemical bond between atoms that share electrons equally is called a(an):
a. ionic bond b. hydrogen bond c. polar covalent bond d. non-polar covalent bond
35. A chemical compound with a polar covalent bond is:
a. soluble in water b. soluble in oil
c. insoluble in water
d. none of the former
36 How many chemical bonds are formed between the two nitrogen atoms in a nitrogen molecule (N2). Nitrogen is in group 5A.
a. 1 b. 2 c. 3 d. 4 e. 5
37. The present of the COOH function group in a molecule indicates that that compound is a/an:
a. base b. aldehyde c. ketone d. acid e. alcohol
38. DNA has how many polypeptide strands:
a. I b.2 c. 3 d. more than 4 e. none
39. Which of the following is not a part of a nucleotide:
a. sugar b. base c. amino d. phosphate
40. Which base pairing is incorrect:
a. A-T b. C-G c. A-U d. C-U
41. A pleated-sheet polypeptide chain has what structure:
a. primary b. secondary c. tertiary d. quaternary
42. What structure is directly determined by genes:
a. primary b. secondary c. tertiary d. quaternary
43. The rungs of the DNA molecule are formed by paired:
a. sugars b. phosphates c. nitrogenous bases d. DNA and RNA
44. U is present only in _______ and T is present only in_____:
a. RNA and RNA b. DNA and RNA c. RNA and DNA
45. Carbon has a valence of 4 which means it:
a. can form 8 bonds b. can form 4 bonds
d. DNA and proteins
c. forms ionic bonds
d. none of these
46. Organic compounds that contain only hydroxyl groups are called:
a. alcohols b. aldehydes c. ketones d. acids
47. Substances that release hydroxide ions are:
a. alcohols b. acids c. bases d. ketones
e. aldehydes
48. Which lipid has 4 interlocking carbon rings and is polar:
a. phosopholipid b. triglyceride c. steroid
d. none of these is correct
49. Ribose with respect to deoxyribose has one extra ______ atom on the number ___carbon:
a. phosphate,1 b. base,5 c. hydroxyl,3 d. H,4 e. O,2
50. Which base is a purine:
a. adenine b. thymine
c. uracil
d. cytosine