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Quiz 219
Mdcat-past-papers Quiz
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4361. The secondary structure of proteins is stabilized by:
Ionic bonds
Hydrogen bonds
Disulfide bridges
Hydrophobic exclusion
4362. The following is an example of a globular protein.
Keratin
Collagen
Hemoglobin
Histone
4363. The process of osmoregulation refers to:
The filtration of blood to remove metabolic waste
The regulation of solute and water movement between an organism and its environment
The creation of an osmotic gradient in the kidney medulla
The secretion of hormones that control blood plasma
4364. A baby girl is born with hemophilia, which is an X-linked recessive disorder. What are the most likely genotypes of her parents?
The mother is a carrier and the father is normal.
The mother is hemophiliac and the father is normal.
The mother is carrier and the father is hemophiliac
Both are normal.
4365. Identify the most appropriate function of chromosomes
Energy production and storage
Protein synthesis and regulation
Storage of genetic information
Lipid metabolism and transport
4366. Enzymes belong to which class of biomolecules?
Carbohydrates
Lipids
Proteins
Nucleic acids
4367. ______ arranges the DNA into the chromosomes in a eukaryotic cell.
Hormones
Elastin
Histone
Nucleosome
4368. The function of nucleolus is to make:
rDNA
Lysosomes
Ribosomes
Chromosomes
4369. Which of the following blood vessels have lowest blood velocity with correct reason for low blood velocity?
Arteries: Due to thick walls
Capillaries: due to highest overall cross-sectional area
Veins: due to blood flow against the gravity
Capillaries: Due to two-way blood flow in capillaries
4370. An active athlete has more stamina of running compared to an officer of same age with physically inactive lifestyle. Which of the following organelles has greatly increased in the muscle cells of athlete?
Nucleus
Mitochondria
Golgi bodies
Smooth endoplasmic reticulum
4371. Once an action potential reaches the membrane of a skeletal muscle fiber, what is the first event that occurs in the contraction process?
Actin and myosin form a cross bridge
Calcium is pumped back into the sarcoplasmic reticulum
Calcium is released from the sarcoplasmic reticulum
ATP is hydrolyzed by troponin
4372. The public symphysis is a slightly moveable joint joined by which of the following tissue?
Elastic cartilage
Fibrocartilage
Costa Cartilage
Articular cartilage
4373. In a sea plant seed color is determined by two alleles: Y (Yellow, dominant) and y (green recessive). Which parental cross would most likely result in offspring showing a 1:1 ratio of yellow to green seeds?
Yy x YY
Yy x yy
Yy x Yy
Yy x yy
4374. Mendel crossed a plant with round yellow seeds (RRYY) and a plant with wrinkled green seed (rryy), what was the phenotype of all F1 offspring?
All round green
All round yellow
All wrinkled yellow
All wrinkled green
4375. In a normal 28 days menstrual cycle when would you expect the LH surge to occur?
Days 7-10
Days 11-14
Days 15-18
Days 19-22
4376. Which property of water helps in moderating Earth's climate and maintaining stable temperature in aquatic environment?
Low viscosity
High specific heat capacity
High surface tension
High polarity
4377. Effect of increased substrate concentration on enzyme activity:
Decrease the rate of reaction
Increase the reaction rate until all active sites are saturated
Have no effect on the reaction rate
Increase the reaction rate in a straight diagonal line
4378. An oligosaccharide is made up of at least:
two saccharide units
ten saccharide units
three to ten saccharide units
more than ten saccharide units
4379. Which statement best explains the difference between humoral and cell mediated immune response?
Humoral immunity involves B-Lymphocytes and cell mediated immunity involves T-Lymphocytes
Humoral immunity destroys viruses and cell mediated immunity destroys bacteria
Humoral immunity is specific and cell mediated immunity is nonspecific
Humoral immunity uses antibodies and cell mediated immunity does not involve immune cells
4380. Which of the following is the correct higher (left) to lower (right) sequence of molecules with respect to their amount in the cell?
DNA → rRNA → tRNA → mRNA
rRNA → tRNA → mRNA → DNA
mRNA → tRNA → rRNA → DNA
DNA → mRNA → tRNA → rRNA
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