Scientists Have Developed a New Type of Margarine Containing Plant

question 53

Multiple Choice

Scientists have developed a new type of margarine containing plant ingredients they think will lower blood cholesterol levels in people who use the margarine.They want to test this by having some people use the new margarine for a while and then compare their cholesterol levels with those of a group of people who use regular margarine.This is an example of what type of research design?​

• A)epidemiological study
• B)case study
• C)​intervention study
• D)​laboratory study
• E)​double-blind study

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Definitions:

Hormones

Chemical messengers produced by the endocrine glands that travel through the bloodstream to target organs or tissues, influencing various bodily functions.

Humoral Immunity

One of the three general categories of immune response, in which invading antigens are presented by macrophages to B-lymphocytes. (“B” stands for bursa, an organ in which such cells are produced in birds. B-lymphocytes derive from the liver and bone marrow in humans.) This causes the B-cells to reproduce—a process reinforced by the lymphokine secretion from the helper T-cells. Some of the activated B-cells remain as memory B-cells. Others go on to be plasma cells, secreting antibodies called immunoglobulins that neutralize antigens in a number of different ways, such as clumping, presenting the antigen to phagocytic cells, or rupturing the antigen.

Macrophages

A type of white blood cell that engulfs and digests cellular debris, foreign substances, microbes, and cancer cells in a process called phagocytosis.

Memory B-Cells

A type of white blood cell involved in the immune response, capable of remembering past infections and pathogens to produce a quicker response upon re-exposure.