University of California, Los Angeles

EE BIOL M139 Final Exam Question 1-27 Q&A

Question 1 (2 points)
A group of researchers investigated the effects of a drug called Pressure Drop Y on lowering
blood pressure in a group of men between the ages of 50 and 70 years old. The researchers did
the following experiment and obtained the indicated results: One group of 150 men took a tablet
containing Pressure Drop Y for 3 weeks – 95 of these men experienced decreased blood pressure
by at least 10%. Another group of 150 men were given a tablet with no added Pressure Drop Y
for 3 weeks – 10 of these men experienced decreased their blood pressure by 10%. What is the
dependent variable in this experiment?
Question 1 options:
Amount of Pressure Drop Y
Blood pressure
The age and gender of the participants
The 3 week time period and sample size of 150
The group of men that received the pills with no added Pressure Drop Y
Question 27 (2 points)
If life on another planet were fundamentally like life on earth, the macromolecules of living things would be
based on which element?
Question 27 options:
A. Carbon
B. Hydrogen
C. Nitrogen
D. Oxygen
E. Phosphorus
Question 26 (2 points)
Which of the following situations has the greatest potential for observer bias in an experimental
study?
Question 26 options:
Ms McCormack is an outside consultant who is conducting a health and wellness survey for a
pharmaceutical company. She neither knows the name of the company, nor the name of the drug
being tested during the survey
Graduate student Jonas Brown is conducting a survey of weight loss for his professor. He asks
each student in the study the same questions.
Dr. Smith is analyzing biopsy examples from rats who have been given either a placebo or an
experimental drug believed to reduce inflammation. Each sample is identified by a code number;
therefore, Dr. Smith cannot tell which treatment each rat received.
Ms Williamson is a research technician who surveys the responses to a new cold remedy by a
study group. She only knows the e-mail address of each participant and asks them identical
questions by computer.
Dr. Jones is evaluating cancer patients for their responses to a new therapeutic drug. She knows
which patients are receiving the drug and which patients are receiving the placebo.
Question 25 (2 points)
How does high heat impact most enzymes?
Question 25 options:
Enzyme activity is decreased due to hydrolysis
Enzymes are inactivated due to denaturation
Enzyme activity is increased due to saturation
Since enzymes are temperature independent activity will remain the same.
Question 24 (2 points)
Which of the following activities decreases greenhouse gases in the atmosphere?
Question 24 options:
Cutting down trees.
Driving gasoline-powered vehicles.
Using electricity from coal power plants.
Planting trees.
Heating your home with an oil furnace.
Question 23 (2 points)
Why do some scientists argue that viruses are non-living?
Question 23 options:
Viruses evolve
Viruses are able to reproduce
Viruses have an organized and complex structure
Viruses are not made of cells
Question 22 (2 points)
What is one way in which energy flow differs from chemical cycling?
Question 22 options:
Energy flow is unidirectional; chemical elements can be recycled.
Energy can enter but cannot leave an ecosystem; chemical elements can leave but cannot enter an
ecosystem.
Energy flows from lower to higher trophic levels; chemicals cycle from higher to lower trophic levels.
Energy can both enter and leave an ecosystem; chemical elements always remain within a single
ecosystem.
Question 21 (2 points)
The Tomato Hornworm is the caterpillar stage of the five-spotted hawkmoth (Manduca
quinquemaculata). The white objects seen on the back of the caterpillar are wasp eggs. When the larvae
hatch they will feed on the worm.Which term best describes the relationship between the wasps and
the Tomato Hornworms?
Question 21 options:
predation
competition
symbiosis
mutualism
Question 20 (2 points)
Which of he following factors in considered teh greatest threat to biodiversity today?
Question 20 options:
Habitat destruction and fragmentation
Invasive species
Overexploitation
Pollution
Question 19 (2 points)
Why are most food chains limited to 3 to 5 trophic levels?
Question 19 options:
The higher the trophic level, the larger the organism; the larger the organism, the less likely it will be prey.
The nutritional quality of existing biomass decreases with increasing trophic level.
Most ecosystems have insufficient space to support the increased number of organisms that more trophic
levels would require.
There is insufficient energy to support more trophic levels.
Question 18 (2 points)
Biomedical scientists study species as different as worms, fruit flies, mice, zebrafish, or rhesus monkeys
to understand human genes and how they lead to diseases. Why?
Question 18 options:
Because these species have many inherited features that are very similar to our own.
Because these species are all prokaryotes, and therefore their genes are 99.9% identical to one another.
Because they make up an interconnected food web when bacteria are added.
Because rhesus monkeys gave us the Rh+ factor when they bit our ancestors.

Question 17 (2 points)
What is a recessive trait?
Question 17 options:
A trait that not everyone in your family share
A trait only visible when organisms are heterozygous for the responsible gene
A trait that a person carries but that does not affect the phenotype
A trait that appears when a person has two recessive alleles for that gene
The least common variation of that trait in a population
Question 16 (2 points)
What is the smallest biological unit that can evolve?
Question 16 options:
Population
Question 15 (2 points)
If human cells were genetically modified (GM), which of the following GM cells would directly affect
future generations?
Question 15 options:
Intestinal
Immune
Gamete
Somatic
Question 14 (2 points)
The information stored in genes is transferred to proteins by which two processes?
Question 14 options:
respiration and translation
translation and mutation
transcription and translation
translation and protein synthesis
respiration and protein synthesis
Question 13 (2 points)
A man carries a sex-linked gene for Goltz Syndrome on his X chromosome. Who will he
pass this on to?
Question 13 options:
All of his daughters
Half of his daughters
All of his sons
Half of his sons
Question 12 (2 points)
In humans, the allele for brown eyes (B) is dominant. The allele for blue eyes (b) is recessive. If a woman
with genotype BB and a man with genotype Bb have four children, how many of the children will have
blue eyes?
Question 12 options:
0 1 2 3 4
Question 10 (2 points)
Which of the following organisms have cellular respiration? Select all that apply.
Question 10 options:
Oak tree
Elephant
Shiitake mushroom
Green algae
Salmon
Question 9 (2 points)
What is the sequence of the mRNA made from the gene AAACAGGTCCCA?
Question 9 options:
AAACAGGUCCGT
TTTGTCCAGGGT
UUUGUCCAGGGU
CCAGTGGACCCA
Question 8 (2 points)
What are two atoms with the same atomic number, but different atomic mass, called?
Question 8 options:
radioactive
isotopes
proteins
electrons
nuclei

Question 7 (2 points)
Which of the following statements about photosynthesis is correct?
Question 7 options:
The light dependent reaction produces glucose from sunlight energy
Oxygen is converted to carbon dioxide in the photosynthetic reaction
The products of cellular respiration are used as reactants in photosynthesis
Water is used during photosynthesis to capture the electrons released from excited chlorophyll
pigments
The oxygen produced in the light reaction is used to make sugars in the Calvin cycle
Question 6 (2 points)
What will most likely happen if a cell's lysosomes burst?
Question 6 options:
The cell would shrivel
The cell would divide into two cells
The cell would digest itself
The cell would need to manufacture more lysosomes

Question 5 (2 points)
Which of the following statements about mitosis and meiosis is *NOT* true?
Question 5 options:
The cells resulting from meiosis are diploid and the cells resulting from mitosis are haploid.
Meiosis and meiosis both starts with one cell, meiosis ends with four and mitosis with two.
Mitosis produces new cells for growth and repair, meiosis produces gametes.
Mitosis goes through cytokinesis once, meiosis goes through cytokinesis twice.
Cross over happens in meiosis, but not in mitosis.
Question 4 (2 points)
What is the atomic number of an element with 9 protons, 10 neutrons and 9 electrons?
Question 4 options:
10
19
9
28

Question 3 (2 points)
You observe a cell under a microscope and don't see a well-defined nucleus. What type of cell is
this?
Question 3 options:
Prokaryotic
Eukaryotic
Plant
Animal


Question 2 (2 points)
Which macromolecule is the primary energy source for organisms?
Question 2 options:
Sunlight
Protein
Fat
Carbohydrate
Nucleic acid