41- Information from the spinal cord is transmitted to an effector through a:
A. Receptor
B. Relay neuron
C. Sensory neuron
D. Motor neuron
View Answer
Answer : D. Motor neuron
Description
42- Which of the following is NOT a part of the brain?
A. Pituitary gland
B. Hypothalamus
C. Corpus callosum
D. Cerebellum
View Answer
Answer : A. Pituitary gland
Description
43- The right and left cerebral hemispheres are connected by the:
A. Hypothalamus
B. Cerebellum
C. Corpus callosum
D. Medulla oblongata
View Answer
Answer : C. Corpus callosum
Description
44- Which part of the brain is associated with emotional responses such as pleasure and fear?
A. Pons
B. Cerebellum
C. Amygdala
D. Medulla oblongata
View Answer
Answer : C. Amygdala
Description
45- Which part of the brain plays a major role in controlling the autonomic nervous system?
A. Hypothalamus
B. Cerebellum
C. Medulla only
D. Corpus callosum
View Answer
Answer : A. Hypothalamus
Description
46- Which phase of the menstrual cycle is most directly associated with the LH surge?
A. Follicular phase
B. Menstrual phase
C. Luteal phase
D. Ovulatory phase
View Answer
Answer : D. Ovulatory phase
Description
47- Which of the following is NOT a sexually transmitted disease?
A. Gonorrhea
B. Syphilis
C. HIV/AIDS
D. Hemophilia
View Answer
Answer : D. Hemophilia
Description
48- Which of the following best defines a monoclonal antibody?
A. Antibodies that bind to a specific antigenic epitope
B. Antibodies that bind only to the host cell surface
C. Antibodies that bind only to the pathogen cell surface
D. Antibodies produced by different types of B-lymphocytes
View Answer
Answer : A. Antibodies that bind to a specific antigenic epitope
Description
49- Genetic diseases can be treated by gene therapy by:
A. Inserting a functional gene into the patient’s cells
B. Removing all genes from the patient’s cells
C. Increasing the number of chromosomes
D. Replacing all proteins in the patient’s body
View Answer
Answer : A. Inserting a functional gene into the patient's cells
Description
50- When two heterozygous organisms (AaBb) are crossed, the probability of obtaining an organism with genotype AABB is:
A. 1/4
B. 1/8
C. 1/16
D. 3/16
View Answer
Answer : C. 1/16
Description
51- The law which explains that the two alleles of a gene separate randomly during gamete formation is:
A. Law of Segregation
B. Law of Independent Assortment
C. Law of Dominance
D. Law of Linkage
View Answer
Answer : A. Law of Segregation
Description
52- During self-crossing of a heterozygous organism, the alleles of a gene:
A. Remain together in the same gamete
B. Produce heterozygous offspring only
C. Produce homozygous offspring only
D. Segregate randomly, producing a phenotypic ratio of 3:1
View Answer
Answer : D. Segregate randomly, producing a phenotypic ratio of 3:1
Description
53- A male suffers from an X-linked recessive disease and dies at the age of 3 years. A female has an allele identical to that present in the affected male but survives. The female is most likely:
A. An affected female
B. An affected male
C. A carrier female
D. A homozygous normal female
View Answer
Answer : C. A carrier female
Description
54- Which type of genetic disease is generally more common in females than in males?
A. X-linked recessive
B. X-linked dominant
C. Y-linked
D. Autosomal recessive
View Answer
Answer : B. X-linked dominant
Description
55- The concept of "use and disuse of organs" was proposed by:
A. Charles Darwin
B. Gregor Mendel
C. Alfred Russel Wallace
D. Jean-Baptiste Lamarck
View Answer
Answer : D. Jean-Baptiste Lamarck
Description
56- Eukaryotic cells are believed to have evolved from:
A. Viruses
B. Prokaryotic cells
C. Multicellular organisms
D. Viruses and bacteriophages
View Answer
Answer : B. Prokaryotic cells
Description
57- Enzymes increase the rate of a chemical reaction by:
A. Increasing the temperature
B. Increasing the activation energy
C. Increasing the concentration of products
D. Lowering the activation energy
View Answer
Answer : D. Lowering the activation energy
Description
58- Inflammation of body tissues is mainly associated with an increased level of:
A. Glucagon
B. Thyroxine
C. Insulin
D. Prostaglandins
View Answer
Answer : D. Prostaglandins
Description
59- Protein digestion in the stomach is reduced due to decreased activation of pepsinogen, which may occur because of a lack of:
A. Bile
B. HCl
C. Pancreatic juice
D. Sodium bicarbonate
View Answer
Answer : B. HCl
Description
60- A chromosome with its centromere located near one end is called:
