Biology - Gene Expression Review

Mutations are inherited if...

• the parent has a mutation

• the mutation is recessive

• the mutation occurs in gametes

• the mutation is harmful

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following is not a cause of gene mutations

• random chance

• nondisjunction

• radiation

• certain chemicals such as benzene

Tags

NGSS.HS-LS3-2

Specifically, a codon is a unit found in which of the following?

• mRNA

• ribosomes

• amino acid

• nucleus

In gene expression, messenger RNA...

• leaves the nucleus and travels to the ribosomes

• leaves the ribosomes and travels to the cell membrane

• leaves the ribosomes and goes into the cytoplasm

• leaves the ribosomes and travels to the DNA

When DNA replicates itself, the double helix unzips and each strand...

• breaks down into nucleotides

• twists back upon itself to form a double strand

• serves as a model, or template to build an exact copy of itself.

• is changed to mRNA

If a particular sample of DNA is 25% Thymine, then what percent of the sample is Adenine?

• 7%

• 75%

• 25%

• 30%

Scientists now understand what a gene is. Precisely, a gene is...

• a sequence of bases in DNA which codes for a protein

• a strand of RNA

• a double helix

• a section of the cell membrane that maintains homeostasis

Frameshift mutations are generally more severe than point mutations. Why?

• Frameshift mutations are always passed on to offspring, point mutations are not

• Frameshift mutations change many codons, a point mutation changes only one codon

• Frameshift mutations cause cancer, point mutations do not.

• Frameshift mutations and point mutations are equally severe.

Tags

NGSS.HS-LS3-2

All species on Earth have a genetic code of DNA that is read in...

• two-nucleotide sequences

• four-nucleotide sequences

• three-nucleotide sequences

• five-nucleotide sequences

What is the process called when a strand of mRNA is produced from a strand of DNA?

• Transcription

• Translation

• Nucleus

• Ribosomes