Which microscope uses an opaque disk to block light that would enter the objective lens directly?

a) Fluorescence microscope
b) Phase-contrast microscope
c) Darkfield microscope
d) Confocal microscope


Ans: c) Darkfield microscope

Biology & Microbiology

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Family, twin, and adoption studies have revealed a(n) _____________________ component to mental illnesses, such as bipolar disorder

Fill in the blank(s) with correct word

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Terrestrial animals are usually subject to more radical changes in their thermal environment than aquatic animals

Indicate whether the statement is true or false

Biology & Microbiology

Eric was working very hard in the dry, hot boiler room and sweating a lot. Under these conditions, which of the following might Eric be experiencing?

A) He has decreased hydrocortisone. B) He has increased oxytocin. C) He has increased antidiuretic hormone. D) He has decreased thyroxine.

Biology & Microbiology

Human skin cells and human white blood cells of the immune system both perform protective functions. Skin cells function primarily in external physical protection, whereas white blood cells function primarily in internal protection. Nonetheless, both

types of cells contain a complete copy of the human genome. Explain how cells can have the same genetic information and yet perform different functions. What prevents skin cells from making all the same proteins of a white blood cell? What will be an ideal response?

Biology & Microbiology