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NATS104 LIFE ON EARTH
INTERNET PRACTICE EXAM ONE
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Name:
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1.
A mother is homozygous for blood type & has type-A blood, while the father is homozygous for blood type & has type-B blood. What blood type can their children be? (
9
)
A
A
B
B
C
AB
D
O
E
all of the above
Unanswered
2.
A person with Klinefelter's Syndrome has the XXY genotype; phenotypically, the person is (
12
)
A
always born dead
B
female
C
male
D
both female and male
E
neither female nor male
Unanswered
3.
An animal cell having one rather than two of each type of chromosome is (
7
)
A
diploid
B
haploid
C
heterozygous
D
homozygous
E
mitotic
Unanswered
4.
AIDS is caused by a (
8
)
A
bacteriophage
B
bacterium
C
fungus
D
protozoan
E
virus
Unanswered
5.
All of the following are true of mRNA EXCEPT it (
8
)
A
brings individual amino acids to the ribosomes
B
codes for protein synthesis in the ribosomes
C
forms in the nucleus
D
has uracil but not thymine
E
is messanger RNA
Unanswered
6.
Archaebacteria have all the following characteristics EXCEPT: (
7
*
)
A
They are resistant to antibiotics
B
They cause several serious diseases
C
They are commonly found in extremely hot and acidic places
D
They are commonly found in methane-rich environments
E
They are commonly found in extremely salty environments
Unanswered
7.
Bacteria are: (
8
)
A
Animals
B
Fungi
C
Eukaryotes
D
Plants
E
Prokaryotes
Unanswered
8.
The offspring of a cross between an AA and an aa individual are (
7
)
A
all AA
B
all Aa
C
all aa
D
half AA & half aa
E
half Aa & half aa
Unanswered
9.
Bonds between atoms involving the sharing of electrons by atoms are called (
3
)
A
covalent
B
ionic
C
isotopic
D
neandertals
E
van der Waals (hydrogen)
Unanswered
10.
Cell membranes of eucaryots consist mainly of (
3
)
A
carbohydrate bilayer and proteins
B
cellulose bilayer and carbohydrates
C
lipid bilayer and proteins
D
protein bilayer and lipids
E
ribonucleotide bilayer and lipids
Unanswered
11.
Crossovers and inversions occur during (
9
)
A
interphase
B
fertilization
C
mitosis
D
meiosis
E
photosynthesis
Unanswered
12.
Elements that have less than or more than the normal number of electrons are (
3
)
A
ions
B
isotopes
C
metals
D
nucleic
E
radioactive
Unanswered
13.
How many nucleotides are in an RNA codon? (
9
)
A
1
B
2
C
3
D
4
E
5
Unanswered
14.
Viruses are like living organisms in that they can by themselves undergo (
7
)
A
energy transfer
B
evolution
C
homeostasis
D
locomotion
E
reproduction
Unanswered
15.
In humans, gender is determined by the (
9
)
A
X chromosome
B
chromosome 1
C
Z chromosome
D
Y chromosome
E
W chromosome
Unanswered
16.
In this equation: H
2
O + ??? => CH
2
O + O
2
, the missing substance is (
3
)
A
CH
3
B
CO
2
C
H
2
0
D
NO
2
E
O
3
Unanswered
17.
Malaria is caused by a (
7
)
A
bacteriophage
B
bacterium
C
fungus
D
protozoan
E
retrovirus
Unanswered
18.
RNA differes from DNA in __ (
3
)
A
RNA has uracil rather than thymine
B
RNA has ribose rather than deoxyribose
C
RNA is single-stranded, DNA is double stranded
D
all of the above
E
none of the above
Unanswered
19.
Leibig's Law states that the most important nutrient in a system is the one (
5
)
A
closest to the optimum for the producers that system
B
highest on the food chain of consumers in the system
C
in least abundance relative to the needs for that system
D
with the greatest charge for molecules in the system
E
with the shortest nutrient cycle of that system
Unanswered
20.
Life is made up of almost entirely (99%) of which six elements? (
3
)
A
Ar, Na, Se, Cl, Li, Mg
B
C, H, O, N, P, S
C
amino acids, bases, fatty acids, nucleic acids, nucleotides, sugars
D
amino acids, cholesterol, DNA, glucose, prions, RNA
E
aRNA, iRNA, mRNA, qRNA, rRNA, tRNA
Unanswered
21.
Organelles (
7
)
A
are absent in procaryotic cells
B
are present in eucaryotic cells
C
may contain DNA
D
separate chemical reactions in time and space
E
all of the above
Unanswered
22.
Phenotype (
7
)
A
determines the arrangement of the chromosomes
B
determines the genotype
C
is determined by the genotype (and the environment)
D
is the last stage of meiosis
E
is the first stage of mitosis
Unanswered
23.
Models _______ systems (
2
)
A
are made by
B
create
C
improve
D
include
E
simulate
Unanswered
24.
Polymers are made of basic units of (
3
)
A
atoms
B
cells
C
electrons
D
molecules
E
neutrons
Unanswered
25.
Procaryotic cells do NOT have __________, but eucaryotic cells DO (
7
)
A
cell membranes
B
DNA
C
mitochondria
D
ribosomes
E
RNA
Unanswered
26.
Molecules are made of __________ held together by __________ (
3
)
A
atoms - bonds
B
ions - electrons
C
neutrons - energy
D
polymers - attraction
E
protons - charge
Unanswered
27.
Nucleic Acids are the building blocks of (
3
)
A
Carbohydrates
B
DNA
C
Fat
D
Protein
E
Sugars
Unanswered
28.
The 64 possible combinations of nucleic acids in a codon code for the ____ common amino acids found in living organisms (
10
)
A
16
B
20
C
40
D
64
E
120
Unanswered
29.
The figure below represents a building block of (
3
)
A
DNA
B
Fat
C
Protein
D
RNA
E
Starch
Unanswered
30.
The biopolymer "protein" is made of building blocks of (
3
)
A
Amino Acid
B
Fatty Acid
C
Nucleic Acid
D
Proton
E
Sugar
Unanswered
31.
The correctly written taxonomic name for living humans is (
5
)
A
Homo
sapiens
B
homo Sapien
C
Homo sapien
D
homo sapiens
E
Homosapien
Unanswered
32.
The first living cells on earth, which appeared during the Archean, were (
6
)
A
animals
B
eukaryotic
C
fungi
D
plants
E
prokaryotic
Unanswered
33.
The following elements are the most important nutrients for life, and make up 99% of all biological material EXCEPT (
3
)
A
C
B
F
C
N
D
O
E
P
Unanswered
34.
The most favorable conditions for an organism's growth are called the (
2
)
A
flux
B
gradient
C
growing season
D
limiting nutrient
E
optimum
Unanswered
35.
The offspring of a cross between an Aa and an aa individual will be (
9
)
A
all AA
B
all Aa
C
all aa
D
half AA & half aa
E
half Aa & half aa
Unanswered
36.
The oxygen of the Earth's atmosphere has accumulated through (
6
)
A
oxidation
B
photosynthesis
C
radioactive decay
D
respiration
E
sexual reproduction
Unanswered
37.
What is the genotype of individual 4 (table below)?
A
LLTT
B
LlTT
C
LLtt
D
llTT
E
lltt
Unanswered
38.
The various forms of a gene, coding for different traits controlled by that gene are called (
7
)
A
alleles
B
genotypes
C
heterozygous
D
homozygous
E
recessive
Unanswered
39.
The primary structure of proteins is determined by (
10
)
A
dRNA
B
mRNA
C
nRNA
D
rRNA
E
tRNA
Unanswered
40.
Protein synthesis usually takes place on ___ in the ____ (
9
)
A
DNA - ribosomes
B
mitochondria - cytoplasm (E.R.)
C
mitochondria - ribosomes
D
ribosomes - cytoplasm
E
chloroplasts - mitochondria
Unanswered
41.
What brings amino acids to the ribosome for protein synthesis? (
8
)
A
dRNA
B
mRNA
C
nRNA
D
rRNA
E
tRNA
Unanswered
42.
Sexual reproduction involves the combination of gametes, the gametes result (primarily) from the process of (
9
)
A
fertilization
B
meiosis
C
mitosis
D
photosynthesis
E
respiration
Unanswered
43.
What is the genotype of individual 2 (table below)? (
7
)
A
LLTT
B
LlTT
C
LLtt
D
llTT
E
lltt
Unanswered
44.
Which is a characteristic of any balanced system? (
2
)
A
Input to large reservoirs is greater than input to small reservoirs
B
Input into reservoirs equals output from the reservoirs
C
All reservoirs are of equal size
D
The number of reservoirs equals the number of inputs
E
The sum of all reservoirs is equal
Unanswered
45.
Which of the following crops results ONLY from asexual reproduction (
7
)
A
corn
B
potatoes
C
rice
D
sugar cane
E
wheat
Unanswered
46.
The haploid number of human chromosomes is (
7
)
A
13
B
16
C
23
D
42
E
46
Unanswered
47.
Which of the following is a gauge of how well a measurement matches the true value? (
2
)
A
accuracy
B
precision
C
probability
D
repeatability
E
stability
Unanswered
48.
Eukaryotic organisms first appeared in the fossil record __ billion years ago (
6
)
A
0.4
B
1.2
C
2.3
D
3.8
E
4.7
Unanswered
49.
Which stage of mitosis is characterized by the splitting of chromosomes into chromatids? (
7
)
A
anaphase
B
interphase
C
metaphase
D
prophase
E
telophase
Unanswered
50.
Refer to the figure below: A. B. C, D, E, and F are fluxes such as evaporation, precipitation and groundwater flow. Which of the following statements must be true? (
5
)
A
A-B = 1,300,000 x 10
3
km
3
B
F = E
C
C = 13 x 10
3
km
3
D
A = B+C
E
D = 0.25 (E-F)
Unanswered
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