CELL SPECIALIZATION IS A PROCESS IN WHICH 

• . cells throughout an organism develop in different ways to perform different tasks.
• . materials move through a cell membrane during exocytosis.
• biologists identify different levels of organization.
• . water moves through a selectively permeable membrane.

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. Cellular respiration is to mitochondria as photosynthesis is to

• osmosis.
• . microtubules.
• chloroplasts.
• ribosomes

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. As a cell grows larger, it has more trouble

• . replicating its chromosomes.
• moving enough nutrients across the cell membrane.
• . moving through the cell cycle.
• completing cell division.

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What is cytokinesis?

• the division of a cell’s cytoplasm
• a pigment in the chloroplast
• . the final phase of interphase
• . the spreading of cancer cells throughout the body

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A group of similar cells that perform a particular function is called a(n)

• . organ
• tissue.
• . organ system
• . multicellular organism.

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. Photosynthesis begins when

• light is absorbed into the chloroplast
• lighted is reflected from the leaves of the plant 
• transpiration begins 

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 Which of the following is NOT a factor that affects photosynthesis?

• . temperature
• water availability
• . light intensity
• heterotroph availability

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Cancer cells do not respond to signals that

• cause cells to continue to grow
• regulate and stop the  growth of most cells 
• produce a defect in a gene called p53
• produce contact with other cells.

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. During which phase of the cell cycle are chromosomes replicated?

• . M phase
• . G₁ phase
• . S phase
• G₂ phase

. During which phase of the cell cycle are chromosomes replicated?

• . M phase
• . G₁ phase
• . S phase
• G₂ phase