A Level Biology Practice Exam

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How are lymphocytes best described?

White blood cells involved in the immune system
Red blood cells responsible for oxygen transport
Platelets that aid in blood clotting
Cells that produce hormones.

The correct answer is: White blood cells involved in the immune system

Lymphocytes are best described as white blood cells that play a critical role in the immune system. They are a key component of the adaptive immune response, specifically involved in recognizing and responding to pathogens such as viruses and bacteria. There are different types of lymphocytes, including B cells, which produce antibodies to neutralize pathogens, and T cells, which can directly kill infected host cells or help regulate the immune response. The role of lymphocytes in immune surveillance and their ability to develop memory for previously encountered antigens make them vital in protecting the body from infections. This function distinguishes them from red blood cells, which are primarily responsible for oxygen transport, platelets that assist in blood clotting, and hormone-producing cells, which have entirely different roles in the body.