21) In a plant cell, DNA may be found _____.
A) only in the nucleus
B) only in the nucleus and mitochondria
C) only in the nucleus and chloroplasts
D) in the nucleus, mitochondria, and chloroplasts
E) in the nucleus, mitochondria, chloroplasts, and peroxisomes
22) Suppose a cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from _____.
A) a bacterium
B) an animal but not a plant
C) nearly any eukaryotic organism
D) a plant but not an animal
E) any kind of prokaryotic organism
23) When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the ion?
A) plasma membrane → primary cell wall → cytoplasm → vacuole
B) secondary cell wall → plasma membrane → primary cell wall → cytoplasm → vacuole
C) primary cell wall → plasma membrane → cytoplasm → vacuole
D) primary cell wall → plasma membrane → lysosome → cytoplasm → vacuole
E) primary cell wall → plasma membrane → cytoplasm → secondary cell wall → vacuole
24) Where are proteins produced other than on ribosomes free in the cytosol or ribosomes attached to the ER?
A) in the extracellular matrix
B) in the Golgi apparatus
C) in lysosomes
D) in mitochondria
E) in the nucleolus
25) A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively, _____.
A) mitochondria and chloroplasts
B) chloroplasts and peroxisomes
C) peroxisomes and chloroplasts
D) chloroplasts and mitochondria
E) mitochondria and peroxisomes
26) Which structure is common to plant and animal cells?
B) wall made of cellulose
C) central vacuole
27) Cyanide binds with at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide will be found within the _____.
E) endoplasmic reticulum
28) A cell with an extensive area of smooth endoplasmic reticulum is specialized to _____.
A) play a role in storage
B) synthesize large quantities of lipids
C) actively export protein molecules
D) import and export protein molecules
29) Why is the smooth endoplasmic reticulum unable to synthesize proteins?
A) No ribosomes are attached to its surface.
B) There is no supply of free amino acids that it can easily access.
C) It stores calcium, which is a known inhibitor of protein synthesis.
D) It has no DNA to direct synthesis of proteins.
30) Lysosomes are considered to be part of the endomembrane system because they _____.
A) deposit end products of digestion in the endoplasmic reticulum
B) facilitate movement between stacks of the Golgi
C) are formed from products synthesized by the endoplasmic reticulum and processed by the Golgi
D) are composed largely of phospholipids
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