Biology Ch. 12

The structure of DNA is described as a ___ formed by two strands of nucleotides.

• double helix

• single spiral

• polymerase chain

• protein molecule

A permanent change in a cell's DNA is called a (an) ____.

• operon

• mutation

• RNA interface

• homeobox gene

Tags

NGSS.HS-LS3-2

The ability to control which genes are expressed is called ____.

• messenger control

• helix response

• external gene selection

• gene regulation

What three types of RNA are found in living cells?

• fragmented, helix, protein

• messenger, ribosomal, transfer

• protein, Okazaki, transfer

• ribosomal, helix, radioactive

The synthesis of messenger RNA from template DNA is called ____.

• transcription

• intron processing

• helix transfer

• ribosomal transfer

DNA strands separate and produce both parental DNA and new DNA during ____.

• semiconservative replication

• conservative replication

• RNA binding

• Okazaki binding

What do the molecules labeled A, C, G, and T represent in DNA?

• nitrogenous bases

• operons

• messenger RNA

• transfer RNA

Tags

NGSS.HS-LS1-1

DNA ____ contain deoxyribose, phosphate, and nitrogenous bases.

• carbon cells

• ribose cells

• nucleotides

• purines

Hershey and Chase used a ____ to infect bacteria in their experiments.

• yeast toxin

• water molecule

• non-viral molecule

• bacteriophage

Which substance binds to the site where messenger RNA will be synthesized?

• RNA polymerase

• template DNA strand

• nucleotide

• adenine