Unit 4 Review #3

What purpose does mRNA serve?

• It edits the cell's DNA to ensure that it is correct before the cell divides during mitosis.

• It makes an exact copy of the cell's DNA to allow the cell to divide during mitosis.

• It provides a single-stranded copy of the cell's DNA for protein synthesis.

• It provides a template for tRNA to determine the sequence of amino acids needed.

A segment of DNA has the sequence ATGCCT. What mRNA sequence will be produced by transcription?

• TUGCCA

• UACGGA

• TACGGA

• AUGCCU

The DNA nucleotide chain is TGA; what is the anti-codon?

• ACU

• UGA

• ACT

• TCA

What amino acid sequence would be coded for by the RNA sequence:

AUG - CCA - UGG

• ile - pro - trp

• met - pro - trp

• met - pro - stop

• met - arg - trp

Tags

NGSS.HS-LS1-1

What is the correct sequence of events by which an individual would ultimately end up with a particular trait, such as brown hair or curly hair?

• 
• 
• 
• 

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which molecule is paired correctly with its role during the process of protein synthesis?

• mRNA - joins amino acids

• nucleus - forms peptide bonds

• ribosome - carries DNA instructions

• tRNA - transports amino acids

Genetic information usually flows in one specific direction. What is the best representation of how genetic information flows?

• DNA→protein→mRNA

• mRNA→protein→DNA

• protein→mRNA→DNA

• DNA→mRNA→protein

Tags

NGSS.HS-LS1-1

Which explanation best describes the main difference between sex cell and somatic cell mutations?

• Only mutations that occur in somatic cells can be passed to the offspring of an organism.

• Only mutations that occur in sex cells are harmful, and usually lethal, to the organism.

• Mutations that take place in a sex cell can be passed to the offspring of the organism.

• Mutations that take place in a somatic cell are always harmful, and usually lethal, to the organism

Tags

NGSS.HS-LS3-2

In sickle cell anemia, the nucleotide adenine is replaced by thymine at the 17th position of the beta chain of hemoglobin.  This mutation changes the codon GAG to GTG.  What type of mutation is described in this example?

• addition

• deletion

• nondisjuntion

• substitution

Tags

NGSS.HS-LS3-2

A DNA mutation in which type of cell could result in changes that can be inherited by future generations?

• liver

• nerve

• sex

• skin

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2