In order to visualize LDL entry into the cell, researchers tagged the LDL with which heavy metal?

a. iron
b. mercury
c. lead


d. manganese
e. zinc


ANSWER: a

Biology & Microbiology

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Carbon-12 and carbon-13 are different in the number of their _____.

A. neutrons
B. electrons
C. protons
D. protons and electrons

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Delayed type hypersensitivity primarily involves

A. erythrocytes. B. B cells. C. T cells. D. mast cells.

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Which genetic event is a source of new alleles within a population?

a. Mutation b. Crossing over during Meiosis I c. Independent assortment during Meiosis I d. Change in chromosomal number e. Fertilization

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The snail-shaped _______________ transduces sound into nerve impulses.

A. vestibule B. malleus C. utricle D. cochlea E. incus

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