Identify the function of proteins.

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(D) Proteins perform a wide variety of functions in biological systems:$1$. Transport: Membrane proteins act as channels or carriers to transport nutr

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All of the above.

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(D) Proteins perform a wide variety of functions in biological systems:$1$. Transport: Membrane proteins act as channels or carriers to transport nutrients across the cell membrane.$2$. Defense: Antibodies (immunoglobulins) are proteins that protect the body against infectious microorganisms.$3$. Regulation and Catalysis: Many hormones (e.g.,insulin) are proteins that regulate physiological processes,and enzymes are proteins that catalyze biochemical reactions.Therefore,all the given statements are correct.

Column $I$	Column $II$
$(a)$ Actin	$(i)$ Transport of respiratory gases
$(b)$ Immunoglobulin	$(ii)$ Immunity
$(c)$ Melanin	$(iii)$ Pigmentation of the body
$(d)$ Hemoglobin	$(iv)$ Muscle movement

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Column $I$ Column $II$

$(a)$ Actin $(i)$ Transport of respiratory gases

$(b)$ Immunoglobulin $(ii)$ Immunity

$(c)$ Melanin $(iii)$ Pigmentation of the body

$(d)$ Hemoglobin $(iv)$ Muscle movement

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