What Is The Water Cycle?

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Home Ecology

⟩ What is the water cycle?

The water cycle represents the circulation and recycling of water in nature.

Liquid water on the planet surface is heated by the sun and turns into water vapor that gains the atmosphere. In the atmosphere large volumes of water vapor, form clouds that when cooled precipitate liquid water as rain. Therefore, water comes back to the planet surface and the cycle is completed. As possible steps of the cycle, water may still be stored in subterranean reservatory or under the form of ice in mountains and oceans and it may also be used in the metabolism of living beings, incorporated into the body of the individuals or excreted through urine, feces, and transpiration.

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Which of the following statements is most correct about the differential Gram stain?
 A) Crystal violet differentially stains Gram positive cells.
 B) Gram's iodine differentially stains Gram positive cells.
 C) Acetone differentially destains Gram negative cells.
 D) Saffron red differentially stains Gram negative cells

Which of the following objectives would give you the best resolution of small objects?
 A) 10x air, N.A. 0.25
 B) 40x air, N.A. 0.65
 C) 64x oil, N.A. 1.4
 D) 100x oil, N.A. 1.25

Transmission electron microscopy is best for high magnification viewing of
 A) internal structure of fixed cells.
 B) internal structure of live, motile cells.
 C) surface structure of fixed cells.
 D) surface membranes of live, motile cells

Monochromatic (one color) light is sometimes used to increase the resolution of light microscopes. Light of which color below would give you the best resolution?
 A) Red
 B) Orange
 C) Green
 D) Blue

Scanning electron microscopy (SEM) is best used to study
 A) small internal cell structures.
 B) surface morphology.
 C) all of the above

Resolution is the ability of a lens to distinguish between small objects close together. What approximate resolution can be obtained with a lower power (10X, N.A. 0.25) objective lens?
 A) 0.2 microns
 B) 0.3 microns
 C) 0.9 microns
 D) 0.25

A microscope in which an image is formed by passing an electron beam through a specimen and focusing the scattered electrons with magnetic lenses is called a
 A) transmission electron microscope
 B) scanning electron microscope
 C) phase-contrast microscope

Living, unstained cells and organisms can be observed best using
 A) fluorescent microscopy
 B) TEM
 C) phase contrast microscopy

Fixation is the process by which the structures of the cells are preserved and fixed in position. An advantage of chemical fixation over heat fixation is that it
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 B) does not destroy internal structures

The substage condenser
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 B) focuses light on the specimen
 C) decreases the amount of light reaching the specimen

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