Instructions

What happens during the termination step of DNA transcription?

1 The mRNA detaches from the RNA polymerase as the RNA polymerase leaves the DNA strand.

2 RNA polymerase moves along the template strand of the DNA creating an mRNA strand.

3 A portion of the DNA unwinds and RNA polymerase attaches to the DNA within the transcription bubble.

4 A ribosome attaches to the initiation codon of a completed mRNA strand.

What happens during the initiation step of DNA transcription?

1 The mRNA detaches from the RNA polymerase as the RNA polymerase leaves the DNA strand.

2. A portion of the DNA unwinds and RNA polymerase attaches to the DNA within the transcription bubble.

3 A ribosome attaches to the initiation codon of a completed mRNA strand.

4. RNA polymerase moves along the template strand of the DNA creating an mRNA strand

. Which situations involve a cell using endocytosis?

1 A cell wraps a portion of its membrane around a droplet of nutrient-rich water and brings the droplet inside the cell

. 2 A white blood cell engulfs a bacterium, brings the bacterium inside the cell, and uses digestive enzymes to destroy the bacterium.

3 Protein molecules used as hormones are disgorged through the cell membrane of the cell in which they were manufactured.

4 LDL cholesterol attaches to cell membrane proteins, triggering the membrane to fold around the cholesterol and bring it into the cell.

5 Water moves across a cell membrane and into a cell through specialized protein tunnels in response to a concentration gradient.

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