Please answer all questions

1		The maximum size of cells is _____ .
			A)	unlimited -- cells can be any size
			B)	limited by the surface area-to-volume ratio
			C)	limited only by the number of organelles it contains
2		A ______ electron microscope provides a three-dimensional view of the surface of an object.
			A)	scanning
			B)	compound
			C)	dissecting
			D)	transmission
3		The plasma membrane is ______ .
			A)	impermeable
			B)	totally permeable
			C)	selectively permeable (semipermeable)
4		What portion of the outer plasma membrane is believed to account for characteristics such as blood type?
			A)	protein chains
			B)	lipid chains
			C)	carbohydrate chains
			D)	both protein and lipid chains
5		Lipid-soluble molecules pass through the plasma membrane by ______.
			A)	osmosis
			B)	transport
			C)	diffusion
6		Normally, body fluids are ______ to cells.
			A)	hypertonic
			B)	isotonic
			C)	hypotonic
			D)	atonic
7		A protein carrier and the use of cellular energy are required in ____.
			A)	passive transport
			B)	osmosis
			C)	diffusion
			D)	active transport
8		The semi-fluid portion of the nucleus is called the ____.
			A)	nucleoplasm
			B)	endoplasm
			C)	exoplasm
			D)	cytoplasm
9		What tiny organelles are attached to the endoplasmic reticulum (ER), forming rough ER?
			A)	ribosomes
			B)	lysosomes
			C)	nucleoli
			D)	mitochondria
10		Sometimes smooth ER specializes in the production of ____ .
			A)	steroid hormones, such as testosterone
			B)	starch
			C)	water
			D)	gas
11		A mitochondrion has a(n) ______ , an inner space filled with a gel-like fluid.
			A)	endoplasm
			B)	nucleoplasm
			C)	matrix
			D)	stroma
12		______ of the cytoskeleton help maintain the shape of the cell.
			A)	Macrotubules
			B)	Microtubules
			C)	Flagella
			D)	Cilia
13		Before a cell divides, the centrioles ______ .
			A)	stay unchanged
			B)	triple in number
			C)	duplicate
			D)	disintegrate
14		Cells lining the respiratory tract contain ______ that help keep the lungs clear of particles.
			A)	flagella
			B)	cilia
			C)	microvilli
			D)	flagella and cilia
15		An enzyme's specificity is caused by the ______ of the active site.
			A)	size
			B)	shape
			C)	elasticity
16		The vitamin ______ is part of the coenzyme NAD.
			A)	thymine
			B)	niacin
			C)	adenine
			D)	lysine
17		Glycolysis occurs ______ .
			A)	in the cytoplasm, outside the mitochondrion
			B)	in the matrix of a mitochondrion
			C)	on the cristae of a mitochondrion
			D)	in the matrix and on the cristae of a mitochondrion
18		Which of these produce most of the ATP in aerobic cellular respiration?
			A)	Krebs cycle
			B)	electron transport system
			C)	glycolysis
19		Fermentation, an anaerobic process, produces 2 ATP per glucose molecule whereas aerobic respiration produces approximately _____ ATP.
			A)	2
			B)	15
			C)	36
			D)	52
20		Sore muscles (cramping and fatigue) following anaerobic exercise is usually due to a buildup of _____.
			A)	carbon dioxide
			B)	water
			C)	lactate
			D)	acetate