Immersion oil is used with some microscope lenses because it has the same __________ as glass.

Fill in the blank(s) with the appropriate word(s)


Answer: Refractive index

Biology & Microbiology

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During which stage of development are germ cell layers first formed?

A. fertilization B. cleavage C. neurulation D. gastrulation E. organogenesis

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Which scientist(s) suggested for the first time

that the proportion of adenine and guanine differs from one species to another?

a. Watson and Crick b. Wilkins c. Hershey and Chase d. Chargaff e. Franklin

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The mutualistic algae that live within the tissues of corals are called ________

Fill in the blank(s) with correct word

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The first heart sound (lub) is produced by the closing of the __________ and __________ valves

a. aortic semilunar; pulmonary semilunar b. right atrioventricular; aortic semilunar c. left atrioventricular; pulmonary semilunar d. right atrioventricular; left atrioventricular e. mitral; left atrioventricular

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