Sunday, 24 November 2024 11:53 PM
MDCAT BIOLOGY MCQs
Q. Which of the following produce digestive enzymes?
Q. A hysterectomy is the surgical removal of the uterus. What effect would this have on the cycle?
No changes in ovarian cycle, but no menstruation.
Anovulation due to lack of negative feedback from estradiol and progesterone.
Decreased development of corpus luteum.
Prolonged menstrual flow.
Q. A particular polypeptide contains 90 amino acids. When the polypeptide is completely hydrolyzed, how many water
molecules are formed during this process?
2
30
45
89
90
Q. Colorblindness is a sex-linked recessive trait. A woman is born colorblind. What can be said with certainty?
Her father and mother are colorblind.
Her mother and daughter are colorblind.
Her father and son are colorblind.
Her father is colorblind, but her son mayor may not be.
Q. The Na+/K+ pump uses a form of ________ _______ known as _________.
passive transport; uniport
facilitated diffusion; antiport
active transport; symport
facilitated diffusion; uniport
active transport; antiport
Q. Identify the phyla that are classified as protostomates.
Platyhelminthes and cnidarians
Echinodermates and chordates
Molluscans and arthropods
Nematodes
Poriferans
Q. White matter in the brain and spinal cord appears white because:
it contains large amounts of myelinated axons.
it does not contain any myelinated axons.
it is composed primarily of cell bodies.
it contains a high concentration of white blood cells
High Yeild Chaps MCQs Practice Page 1
it contains a high concentration of white blood cells
to protect the central nervous system from infection.
Q. Women treated over a long period of time with relatively large doses of progesterone and estrogen do not
ovulate. This is most likely due to:
inhibition of FSH.
direct inhibition of progesterone by estrogen.
over stimulation of FSH by estrogen.
I only
II only
I and II only
II and III only
Q. All of the following hormones are produced by the anterior pituitary EXCEPT:
thyroxine
growth hormone
prolactin
leutinizing hormone
Q. Given that the curve designated II is FSH, identify the other three.
I = LH; III = progesterone; IV = estrogen
I = estrogen; III = LH; IV = progesterone
I = progesterone; III = LH; IV = estrogen
I = LH; III = estrogen; IV = progesterone
I = estrogen; III = progesterone; IV = LH
Q. Which of the following hormonal and physiologic effects of stress would NOT be expected in a marathoner
in the last mile of a marathon?
Increased glucagon secretion
Increased heart rate
Decreased ACTH secretion
Decreased blood flow to the small intestine
Q. During a muscular contraction:
both the thin and thick filaments contract.
the thin filament contracts. but the thick filament does not.
the thick filament contracts, but the thin filament does not.
neither the thin nor the thick filament contract.
Q. Irreversible sequestering of calcium in the sarcoplasmic reticulum would most likely:
result in permanent contraction of the muscle fibers. similar to what is seen in rigor mortis.
create a sharp increase in bone density as calcium is resorbed from bones to replace the sequestered
calcium.
prevent myosin from binding to actin.
depolymerize actin filaments in the sarcomere.
Q. DNA from phage resistant bacteria is extracted and placed on agar with phage-sensitive E. coli. After
incubation it is determined that these E. coli are now also resistant to phage attack. The most likely
mechanism for their acquisition of resistance is:
transduction.
sexual reproduction.
High Yeild Chaps MCQs Practice Page 2
sexual reproduction.
transformation.
conjugation.
Q. Meiosis takes place in which structure(s)?
VII
I and VI
II, III, IV, and V
II, V, and VII
III and VII
Q. All of the following are composed of microtubules EXCEPT:
the tail of a sperm cell
the spindle apparatus
the cilia of the fallopian tubes
the flagella of bacteria
Q. Omeprazole is used to treat duodenal ulcers that result from gastric acid hypersecretion. Omeprazole
blocks the secretion of HCI from the parietal cells of the stomach. Which of the following is LEAST likely to
occur in a patient taking omeprazole?
an increase in microbial activity in the stomach
a decrease in the activity of pepsin
an increase in stomach pH
a decrease in carbohydrate digestion in the stomach
Q. The first vaccine by Edward Jenner in 1798 protected against smallpox. He used a related strain of
microorganisms that caused cowpox as a vaccination against the microorganisms of smallpox. What type of
immunity was conferred in this case?
Artificially acquired active immunity.
Artificially acquired passive immunity.
Naturally acquired active immunity.
Naturally acquired passive immunity.
Q. According to the passage, removal of the thymus from an adult human would most likely result in:
drastically decreased antibody-mediated immune response.
drastically decreased cell-mediated immune response.
drastically decreased antibody and cell mediated immune response.
little or no change in the effectiveness of either type of immune response.
Q. What is the net ATP production from fermentation?
0ATP
2ATP
4ATP
8ATP
Q. Deficiency of the enzyme enteropeptidase results in a disorder displaying which of the symptoms listed
below?
Fat deficiency
Increases in fat absorption
Protein deficiency
Vitamin B12 deficiency
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