STAAR Organism Growth and cell differentiation

Dogs have 39 pairs of chromosomes in their somatic cells. In which part of the cell are these chromosomes replicated during the cell cycle?

• Nucleus

• Cytoplasm

• Cell membrane

• Mitochondria

Tags

NGSS.HS-LS1-4

As unspecialized cells mature, what controls their development into specific cell types?

• The rate at which the cells grow

• The genes expressed within the cells

• The nutrients available to the cells

• The age of neighboring cells

Tags

NGSS.HS-LS1-4

Which statement explains how the different cell types in the image are formed?

• Each cell type uses its own unique replication process.

• Each cell type expresses different genes at different times.

• Each cell type contains a different part of the original DNA.

• Each cell type has different enzymes to replicate genetic material.

Tags

NGSS.HS-LS1-4

NGSS.HS-LS1-1

Scientists have reported that more than 95% of the factors that lead to some types of cancers are caused by random DNA-copying errors. During which phase of the cell cycle do these DNA-copying errors most likely occur?

• S phase

• G₁ phase

• G₂ phase

• M phase

Which of these properties is found only in cancer cells?

• Unregulated cell division

• Regulated gene expression

• Response to signals outside of the cell

• Presence of mitochondria