All Free Veterinary Science MCQs with Answers

• A. Tetanospasmin from Clostridium tetani
• B. Botulinum toxin from Clostridium botulinum
• C. Endotoxin from Escherichia coli
• D. Alpha toxin from Clostridium perfringens

Explanation: Tetanospasmin blocks inhibitory neurotransmission, producing muscle rigidity, spasms, and a locked jaw.

• A. Progesterone
• B. Oxytocin
• C. Follicle stimulating hormone
• D. Cortisol

Explanation: Teat stimulation causes release of oxytocin from the posterior pituitary, producing contraction of myoepithelial cells around the alveoli.

• A. Toxoid vaccine
• B. Inactivated whole cell vaccine
• C. Live attenuated vaccine
• D. Passive antiserum

Explanation: Live attenuated vaccines contain organisms weakened so they usually replicate without causing the full disease, generating broad immune…

• A. High fever with painful swollen joints
• B. Severe jaundice with dark orange urine
• C. Profuse salivation with repeated swallowing
• D. Cold ears with muscle weakness and depression

Explanation: Early hypocalcaemia commonly causes weakness, depression, cold extremities, and reduced rumen motility before the cow becomes recumbent.

• A. Aseptically obtained cystocentesis sample
• B. Urine collected from the examination table
• C. Midstream sample from an unclean floor
• D. Sample taken from the fur around the prepuce

Explanation: Cystocentesis collects urine directly from the bladder and greatly reduces contamination from the skin, genital tract, and environment.

• A. Streptococcus zooepidemicus
• B. Streptococcus equi subsp. equi
• C. Rhodococcus equi
• D. Actinobacillus equuli

Explanation: Strangles is caused by Streptococcus equi subsp. equi, which produces fever and abscessation of the retropharyngeal lymph nodes.

• A. Simulium black fly
• B. Rhipicephalus hard tick
• C. Culicoides biting midge
• D. Culex mosquitoes

Explanation: Bluetongue virus is transmitted mainly by female Culicoides biting midges.

• A. Decreased serum insulin concentration
• B. Decreased serum thyroxine concentration
• C. Increased serum cortisol concentration
• D. Increased serum thyroxine concentration

Explanation: Feline hyperthyroidism usually causes an increased total serum thyroxine concentration because of excessive thyroid hormone production.

• A. Reduce inhaled stable dust and mould
• B. Increase dry hay and bedding dust
• C. Keep the horse in a closed stable
• D. Administer antibiotics throughout the year

Explanation: Reducing dust and mould exposure, often by improving ventilation and using steamed or soaked hay, is central to managing recurrent airway…

• A. Vitamin C deficiency
• B. Thiamine deficiency
• C. Vitamin K deficiency
• D. Riboflavin deficiency

Explanation: Thiamine deficiency is associated with polioencephalomalacia, producing cortical neurologic signs such as blindness, opisthotonus, and…

• A. Follicle-stimulating hormone
• B. Progesterone
• C. Prostaglandin F2 alpha
• D. Oxytocin from the posterior pituitary

Explanation: The uterine endometrium releases prostaglandin F2 alpha, which causes regression of the corpus luteum in a non-pregnant cow.

• A. Capsular swelling by hyaluronic acid
• B. Tetanus neurotoxin production
• C. Mycolic acid formation
• D. F5 or K99 fimbrial adhesion

Explanation: F5, also called K99, fimbriae allow enterotoxigenic E. coli to attach to receptors on the neonatal calf intestine.

• A. Bursa of Fabricius
• B. Thymus gland
• C. Pancreas
• D. Cecal tonsils

Explanation: Infectious bursal disease virus primarily damages the Bursa of Fabricius, an important site of B-lymphocyte development in young chickens.

• A. Persistent circling with head pressing
• B. Shifting weight between painful forefeet
• C. Unilateral facial paralysis
• D. Marked inspiratory stridor

Explanation: A horse with laminitis commonly shifts weight, stands with the forelimbs stretched forward, and shows painful feet, especially in the…

• A. Collapsed urinary bladder
• B. Diffuse mineralized lung nodules
• C. Compartmentalized gas-filled stomach
• D. Generalized thickened intestinal walls

Explanation: Gastric dilatation-volvulus can produce a compartmentalized or double-bubble gas pattern because the stomach is abnormally rotated.

• A. Catalase test
• B. Oxidase test
• C. Indole test
• D. Urease test

Explanation: Staphylococcus aureus is catalase positive, whereas Streptococcus species are catalase negative.

• A. O antigen
• B. Lipid A
• C. Core polysaccharide
• D. Capsular polysaccharide

Explanation: Lipid A is the toxic portion of lipopolysaccharide in the outer membrane of Gram-negative bacteria.

• A. C1 through C4
• B. C3a and C5a
• C. C5b through C9
• D. Factor B and properdin

Explanation: The membrane attack complex consists of C5b, C6, C7, C8 and multiple C9 molecules.

• A. IgA
• B. IgE
• C. IgM
• D. IgG

Explanation: IgG is the most abundant immunoglobulin in serum and provides important systemic and long-term antibody protection.

• A. Mycolic acids
• B. Teichoic acids
• C. Lipoteichoic acids
• D. Hyaluronic acid

Explanation: Mycolic acids are long-chain fatty acids in the mycobacterial cell wall and retain the primary stain during acid-fast staining.