Which type of lymphocyte is capable of killing tumor cells and infected cells without prior sensitization?

Helper T cells.

B cells.

Natural killer cells.

Cytotoxic T cells .

Answer and Explanation

The Correct Answer is C

Natural killer (NK) cells are large granular lymphocytes that are capable of destroying cells infected by viruses or bacteria and susceptible tumor cells without prior sensitization and restriction by MHC antigens.

Helper T cells (choice A) are a type of white blood cell that helps other immune cells respond to infections but do not directly kill infected or tumor cells.

B cells (choice B) are a type of white blood cell that produces antibodies to fight infections but do not directly kill infected or tumor cells.

Cytotoxic T cells (choice D) are a type of white blood cell that can kill infected or tumor cells but require prior sensitization to do so.

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Correct Answer is B

Explanation

Osmosis is the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

The concentration of solute particles in the solution is the primary factor that determines the movement of water across cell membranes in osmosis.

Hydrostatic pressure (choice A) can affect the movement of water across cell membranes but is not the primary factor responsible for osmosis.

Temperature (choice C) can affect the rate of osmosis but is not the primary factor responsible for osmosis.

Kinetic energy of liquid water molecules (choice D) can affect the rate of osmosis but is not the primary factor responsible for osmosis.

A. The shape and surface area of the object. B. The mass and volume of the object. C. The acceleration and momentum of the object. D. The height and distance of the fall.

Correct Answer is A

Explanation

The terminal velocity of an object falling through a fluid is affected by several factors, including its mass and shape.

Objects with large surface areas will often experience a large amount of air resistance when they move.

Choice B is incorrect because the volume of the object does not affect its terminal velocity.

Choice C is incorrect because the acceleration and momentum of the object do not affect its terminal velocity.

Choice D is incorrect because the height and distance of the fall do not affect the terminal velocity of a falling object.

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Which type of lymphocyte is capable of killing tumor cells and infected cells without prior sensitization?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Which factor is primarily responsible for the movement of water across cell membranes in osmosis?

Correct Answer is B

Explanation

A nurse cares for a patient who has suffered a traumatic brain injury after falling from a height. The nurse knows that the severity of the injury depends on the speed at which the patient hit the ground. Which of the following factors affects the terminal velocity of a falling object?

Correct Answer is A

Explanation

A patient with chronic kidney disease is at risk for developing which of the following electrolyte imbalances?

Which of the following represents the first line of defense to an intruding pathogen?

A nurse is caring for a patient who has been declared brain dead and is awaiting organ donation. Which of the following interventions is most important to preserve the viability of the organs?

During the menstrual cycle, which structure in the ovary produces progesterone to prepare the endometrium for potential implantation?

Which type of bond is responsible for the unique properties of water and plays a crucial role in the structure of DNA and proteins?

What is the purpose of using PCR (polymerase chain reaction) in the laboratory?

Which process involves the fusion of male and female gametes resulting in the formation of a zygote?

In a well-designed experiment, all variables apart from the treatment should be kept constant between what?