MCAT Practice Tests
May 24, 2009 by: admin
1. Which of the following statement complements this statement.
“Metabolism is the process by which
a cell duplicates itself.”
fluid moves through a membrane.”
a cell defends the organism from outside attackers.”
an organism produces and uses energy.”
2. What is organization of life ?
Organization of life may be explained as the manner in which smaller
components of any structure, system or organism are arranged in a
hierarchy to coordinate with each other towards a goal.
The various levels of biological organization are as follows:
Atoms——-> Molecules and Compounds ——-> Living Cells—->
Tissues——–> Organs ———> System ——–> Individual——>
Population——-> Community——> Ecosystem——> Biosphere
3. Briefly explain the difference between mitosis and meiosis.
NUCLEUS
IN PROPHASE
IN METAPHASE
IN ANAPHASE
DAUGHTER CELLS
PLOID CONDITIONS
4. Identify the option from the following list that correctly completes the
statement: “Mitosis is the process by which
fluid moves through a membrane.”
a cell divides itself into two completely new, but identical cells.”
a cell divides itself into four completely new cells.”
the cytoplasm of a cell divides to split the two cells.”
5. Identify the option from the following list that states the stages of mitosis in
the correct order:
Anaphase, interphase, metaphase, prophase, telophase.
Prophase I, metaphase I, anaphase I, telophase I, prophase II,
metaphase II, anaphase II, telophase II.
Prophase, metaphase, anaphase, telophase, interphase.
Anaphase, interphase, metaphase, prophase, cytokinesis.
6. Identify the option from the following list that correctly completes the statement:
“Meiosis is the process by which
the cytoplasm of a cell divides to split the two cells.”
fluid moves through a membrane.”
a cell divides itself into two completely new, but identical cells.”
a cell divides itself into four completely new cells.”
7. Which of the following is not a practical way to isolate human gene that
mutates to cause a disease?
Sequence DNAs from people with and without the genetic mutation
to determine the differences
Use an antibody to isolate the mRNA for the protein involved, make a
cDNA copy, and then use this cDNA to probe a genomic library
Compare the DNA of a person with the disease (which has a deleted
chromosome) with the DNA from a person without the disease to see
if the latter has extra sequences, which contain the target gene
Use DNA markers that are closely linked to the mutant gene and then
isolate the gene by molecular methods
Isolate DNAs from people with and without the disease and insert each
into cloning vectors to see what proteins are made
8. Mutational “hot spots” in human DNA …….
always occur in genes that are transcribed
involve long stretches on nucleotides.
occur where there are triplet repeats, such as CTG
are very rare in genes that code for proteins
are common at cytosines that have been modified to methylcytosine
9. Newborn genetic screening for PKU …
is very expensive
must be done during the first day of an infant’s life
detects phenyiketones in urine
has not led to the prevention of mental retardation resulting
from this disorder
uses bacterial growth to detect excess phenylalanine blood
10. Genetic diagnosis by DNA testing…
cannot be done with PCR
involves hybridization to rRNA
can be done only on eggs or sperm
detects only mutant and not normal alleles
utilizes restriction enzymes and polymorphic site
11. Most human cancers …
are caused by viruses
are in blood cells or their precursors
spread through solid tissues rather than by the blood
or lymphatic system
involve mutations of somatic cells
are inherited
12. Multifactorial disease :
are less common that single-gene diseases
involve the interactions of several mRNAs.
involve the interaction of many genes with the environment
are exemplified by sickle-cell anemia.
affect less than 1 percent of humans
13. In fragile-X syndrome,
females are affected more severely than males
a short sequence of DNA is repeated many times to create the
fragile site
both the X and Y chromosomes tend to break when prepared
for microscopy
all people who carry the gene that causes the syndrome are
mentally retarded
the basic pattern of inheritance is autosomal dominant
………………………………………………………………………………………………………………………..
The International Biology Olympiad (IBO)
A science olympiad for high school students.
IBO promotes a career in science of Biology for talented students and provides an opportunity to compare educational methods and exchange experiences. This improves biology education on a national level. Several organisation as schools and educational institutions, like ministries of education, industry, teachers’ associations cooperate and promote this activity.
Some questions for Biology Olympians
1. Names of some proteins are given below.
A. collagen B. hemoglobin C. albumin D. actin E. casein
Which of these is a ____________protein?
1. transport
2. storage
3. fibrous
4. contractile
2. Five structures found in living cells are given here.
A. Ribosomes B. Chloroplasts C. Mitochondria
D. Lysosomes E. Peroxisomes
Which of these
1. contain DNA within ?
2. can be found in bacteria?
3. contain a single membrane?.
4. contain catalase enzyme?
3. The diagram given below indicates the change of the rate of an enzyme
reaction with a change of one variable factor.
1. What is the variable factor that suits the X-axis of the graph ?
2. What happens to the enzyme in the phase B of the graph?
3. Is the change that happens to enzyme in phase B is reversible?
4. Name a starch hydrolyzing enzyme that behaves this way
4. Some geological periods of earth are given below.
(A) Cambrian (B) Permian (C) Devonian
(D) Jurassic (E) Quaternary
Which of these periods
1. can be considered as the age of fishes?
2. marked by the appearance of birds?
3. marked by the extinction of trilobites?
4. marked by the appearance of flowering plants?
5. This question is based on the following.
A. Ulva B. Pteridophyta C. Reptilia D. Dicotyledoneae E. Lepidoptera
Which of the above represents
1. a phylum/division?
2. a class?
3. a genus name?
4. an order?
6. The diagram given below indicates an experiment on respiration of germinating seeds.
The two respirometers A and B have equal samples of seeds. Flask A has a tube containing KOH in addition to seeds. Initial levels of liquid columns in the tubes are indicated as 0. After one hour the liquid column in A was h1 and that of B was h2.
1. Calculate the Respiratory Quotient. RQ= h1-h2/ h1
2. If the flask contained germinating Sesame seeds what will be the approximate value of Respiratory Quotient?
3. If the two flasks contained germinating Mung seeds will h2 be 0, -ve or +ve?
4. Why is this experiment done with germinating seeds and not with dry seeds?
7. The diagram given below indicates some experiments done by Went with coleoptiles oat seedlings. A coleoptile grown in darkness was decapitated and the tip was kept on a block of agar for a few minutes. A indicates the agar block placed sideways on another decapitated coleoptile. B indicates the control for this experiment.
1. If the agar block in B was placed in the center of coleoptile (not sideways) what would have been the result?
2. What is the substance that was discovered by these experiments?
3. Why is this experiment carried out in dark?
4. How is the agar block shown in B different from that shown in A
8. The diagram given below shows a part of a transverse section of a stem as seen under microscope.
1. What is more likely to be the plant from which the section has been taken ; Sunflower or a Grass?
2. What is the type of tissue labeled as A?
3. What are the structures labeled as B?
9. Answer the following questions based on human heart.
1. The stimulus for contraction of heart is generated by ______
2. The finer branches of the cardiac fibers that transmit impulses in the heart are known as ________
3. Time taken to complete atrial and ventricular diastole for an adult human at rest is________
4. Volume of blood pumped per minute into the systemic circuit is known as __________
10. This question is based on the vitamins listed below
A – Vitamin A (retinol)
B – Vitamin B3 (niacin)
C – Vitamin C (ascorbic acid)
D – Folic acid
E – Vitamin
K. (phylloquinone)
1. Deficiency of which leads to impaired immunity?
2. Which is a component of coenzyme NAD?
3. Deficiency of which leads to night blindness?
4. Deficiency of which leads to anemia?
———————————————————————————————————————————-
i want give answers.i want to become a member of biology olympaid.
i think the specie in the image might be the mule
Hello Saurabh,
It is a Nigai common in Punjab