Gene Expression

DNA in the nucleus carries the genetic code for making proteins in ribosomes. The diagram shows a model of DNA. Which part of the DNA molecule codes for the amino acid sequence in the protein?

• Phosphate

• Nitrogen bases

• Sugar

• Deoxyribose

Tags

NGSS.HS-LS1-1

The process by which the Genetic code of DNA is copied into a strand of RNA is called

• translation

• transcription

• replication

• transformation

in messenger RNA, each codon specifies a particular

• nucleotide

• purine

• amino acid

• pyrimidine

Which of the following observations would support the claim that DNA determines the structure of proteins produced by cells?

• Similar DNA sequences are found in organisms that produce the same protein

• Both DNA and the production of proteins was observed in early life forms

• Organisms that produce proteins have different lengths of DNA

• DNA is found in the nucleus of all cells that produce proteins

Tags

NGSS.HS-LS1-1

Which event occurs first during the process of protein synthesis?

• A tRNA amino acid enters the ribosome and pairs with a codon of mRNA.

• The ribosome binds to the mRNA molecule

• A mRNA molecule is transcribed from DNA and released from the nucleus

• The ribosome encounters a stop codon and triggers the release of a newly built protein.

What process is responsible for new tissue growth and the healing of cuts.

• duplication

• transcription

• meiosis

• mitosis

Tags

NGSS.HS-LS1-4

Which statement is true about mitosis?

• It makes gametes

• It produces sperm and egg cells

• It makes identical cells

• It produces cells with half the number of chromosomes.

Tags

NGSS.HS-LS1-4

Why does the amount of DNA increase before cell division?

• It is important that mitosis creates new cells within the same number of chromosomes as the original cell.

• Mitosis triples the number of chromosomes to give new cells a better chance of survival

• Deletion of chromosomes through mitosis is essential to maintain a species in the future

• Mitosis forms sperm and eggs which must have half the number of chromosomes as the original cell.

Tags

NGSS.HS-LS1-4

Differentiation of cells is responsible for which feature of complex organisms? Without differentiation, complex organisms would not

• require nutrients for growth

• respond to their environment

• be multicellular

• have specialized tissues

Tags

NGSS.HS-LS1-4

Uncontrolled cell division occurs in

• cancer

• mitosis

• cytokinesis

• meiosis

Tags

NGSS.HS-LS1-4