Biochemical oxygen demand is a measure of the
A) number of bacteria present in a water sample.
B) amount of oxygen present in a water sample.
C) amount of organic matter present in a water sample.
D) amount of undissolved solid matter present in a water sample.
E) amount of nitrogen in a water sample.
C
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The appendicular skeleton is attached to what?
What will be an ideal response?
______________ is a thick fluid inside the chloroplast membrane. Suspended within it are disk-like membranous sacs known as _______________, which are concentrated in stacks called _______________.
a) The stroma, grana, phloem b) The stroma, grana, xylem c) The stroma, thylakoids, xylem d) The stroma, thylakoids, grana e) The stroma, thylakoids, phloem
In animals, nitrogenous wastes are produced mostly from the catabolism of _____
A) starch and cellulose B) triglycerides and steroids C) proteins and nucleic acids D) phospholipids and glycolipids
A student examining leaf cross sections under a microscope finds many loosely packed cells with relatively thin cell walls. The cells have numerous chloroplasts. What type of cells are they?
A) parenchyma B) endodermis C) collenchyma D) sclerenchyma