MDCAT Past Papers - Biology - UHS

521. Receive, retain and nourish a fertilized ovum is the main function of:

Cervix
Uterus
Ovary
Oviduct

522. The primary function of larynx is:

Humidifying air
Filtering dust
Gaseous exchange
Voice production

523. During menstrual cycle, luteinizing hormone (LH) is secreted due to:

Decrease in Estrogen
Decrease in FSH
Increase in FSH
Environmental effect

524. Left and right cerebral hemispheres are connected with each other by:

Corpus luteum
Corpus callosum
A band of dendrites
Dorsal and ventral nerve roots

525. Which is the common feature between cardiac and smooth muscles?

Voluntary
Involuntary
Branched
Unbranched

526. The joints which cause rotational movements are

Hinge
Ball and Socket
Cartilage
Sutures

527. Self-fertilization in plants through successive generations can lead to the development of:

Hybrid breeds of plants
Variations in coming generation
True breeding plants
Adaptation with their environment

528. Which part of the neuron typically receives incoming signals from other neurons?

Axon
Dendrites
Myelin sheath
Synaptic knob

529. Why thick filaments are unable to bind with thin filament in a relaxed muscle fiber?

Actin blocks the myosin binding site
Tropomyosin blocks the myosin binding site
Troponin blocks the myosin binding site
Tropomyosin blocks the troponin binding site

530. Which of the following best highlights the importance of proteins in immunity?

They act as receptors of pathogens
They are long term energy reserves
They act as antibodies
They act as mechanical barrier for pathogens

531. The secondary structure of proteins is stabilized by:

Ionic bonds
Hydrogen bonds
Disulfide bridges
Hydrophobic exclusion

532. The following is an example of a globular protein.

Keratin
Collagen
Hemoglobin
Histone

533. 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

534. 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.

535. Identify the most appropriate function of chromosomes

Energy production and storage
Protein synthesis and regulation
Storage of genetic information
Lipid metabolism and transport

536. Enzymes belong to which class of biomolecules?

Carbohydrates
Lipids
Proteins
Nucleic acids

537. ______ arranges the DNA into the chromosomes in a eukaryotic cell.

Hormones
Elastin
Histone
Nucleosome

538. The function of nucleolus is to make:

rDNA
Lysosomes
Ribosomes
Chromosomes

539. 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

540. 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