Lesson 26: Cell Differentiation

Gene expression can be regulated by -

• messenger RNA

• environmental cues such as temperature and oxygen levels

• nerve impulses

• the brain

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The process by which the DNA code is copied to make messenger RNA is called (a)   .

The process by which transfer RNA assembles a protein at the ribosome is called (a)   .

Which of the following is defined as an organic molecule made up of amino acids?

• protein

• cue

• gene

• RNA

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Select all answers below that describe how cell differentiation and gene expression play a vital role at each stage of embryonic development.

• By assigning specific functions to cells

• By recognizing foreign invaders in the body

• By regulating the proteins produced by cells

• By discharging waste matter from the cell

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The process of a simple cell becoming more specialized is called -

• transcription

• translation

• cell multiplication

• cell differentiation

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When a gene is activated and creates a product for the cell, the process is called -

• gene expression

• locomotion

• translation

• heredity

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Genes are composed of -

• enzymes

• lipids

• DNA or RNA

• amino acids

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Differentiation occurs when genes are expressed, and genes are expressed when proteins are made by the cell. The role of DNA in cell differentiation is -

• DNA speeds up cell division

• DNA deactivates mutant cells

• DNA has the code for making proteins

• DNA regulates the temperature of the cell

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_________ instruct the cell on how and when to build the proteins that allow it to build structures and perform its specialized functions.

• proteins

• genes

• ribosomes

• mitochondria

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