Cell Cycle Regulators & Tumor Suppressor Genes | Proto-oncogenes & Oncogenes

The video tutorial explains the differences between proto-oncogenes and oncogenes, highlighting how oncogenes can lead to cancer. It covers the transcription of DNA to mRNA and the translation into proteins, focusing on cell cycle regulators. The tutorial discusses the cell cycle phases, checkpoints, and the consequences of mutations in cell cycle regulators, leading to uncontrolled cell division and cancer. It also differentiates between proto-oncogenes and oncogenes, and explains the role of tumor suppressor genes and proteins in preventing uncontrolled cell growth.

What is the primary function of proto-oncogenes in a healthy cell?

• To repair DNA mutations

• To cause cancer

• To regulate the cell cycle

• To encode defective proteins

Which phase of the cell cycle is primarily responsible for DNA replication?

• S phase

• Mitosis

• G2 phase

• G1 phase

What happens when cell cycle regulators are defective?

• Cells become smaller

• Cell division slows down

• Uncontrolled cell division occurs

• DNA replication stops

How does a proto-oncogene become an oncogene?

• By repairing DNA

• By undergoing a mutation

• Through protein synthesis

• Through normal cell division

What is the role of tumor suppressor proteins in a cell?

• To enhance protein synthesis

• To block uncontrolled cell processes

• To mutate DNA

• To accelerate cell growth

What is a potential consequence of a mutation in a tumor suppressor gene?

• Enhanced DNA repair

• Uncontrolled cell growth

• Decreased cell size

• Increased cell cycle checkpoints

Which of the following is NOT a characteristic of cancer cells?

• Uncontrollability

• Controlled growth

• Abnormality

• Invasiveness