Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts.
B) Plant cells are always much larger than animal cells.
C) Chromosomes are found only in plant cells.
D) Only plant cells have a cell membrane.
E) The plant cell has no cell wall.
A) Plant cells may contain chloroplasts.
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Blood pressure forces water and small solutes out of blood and into nephrons during _____
a. glomerular filtration b. tubular reabsorption c. tubular secretion d. both glomerular filtration and tubular secretion
Secondary succession occurs ____
a. after a fire b. on a new volcanic island c. on bare rock d. on land exposed as a glacier retreats e. in the area between high tide and low tide
Which of the following is NOT an inhibitor of DNA and RNA synthesis?
A. Rifampin B. Erythromycin C. Metronidazole D. Nalidixic acid
A key difference between simple sugars and more complex sugars (disaccharides and polysaccharides) is that simple sugars:
A) must undergo some preliminary processing before the energy can be released from their bonds. B) are made up of one sugar unit or building block. C) have a particular molecular shape that does not stimulate the sweetness receptors on the tongue. D) are important sources of fuel for cells. E) can be broken down into different types of carbohydrate molecules.