A gene can be defined as A A three base triplet that specifi

A gene can be defined as A. A three base triplet that specifies a particular amino acid B. A segment of DNA that carries the instructions for a protein C. An RNA messenger that codes for a particular polypeptide D. Noncoding segments of DNA. In order for a cell to become cancerous, oncogenes must be _____, or tumor suppressors are _____. A inactivated; activated B. activated activated C. inactivated; inactivated D. activated; inactivated In the biology lab, you are shown petri dishes of cheek cell cultures. One set of cells is thin, with individual cells arranged in a single, orderly layer. The other culture shows irregular crowding of cells. The crowding cells are likely cancer cells, showing an absence of A. angiogenesis. B. contact inhibition. C. telomerases. D. Oncogenes Which of the following statements is/are correct about cancerous cells A. Metastasize B. Escape the cell cycle checkpoints C. Arise from an underactive tumor suppressor gene D. All of the above statements are correct Which of the following statements is correct about apoptosis? A. Apoptosis occurs to regulate the number of cells in the body B. Apoptosis is a type of cellular death that does not damage other neighboring cells C. Cells that undergo apoptosis will be eliminated by macrophages or phagocytes D. All of the above are correct The enzyme that builds a short complementary piece of RNA at the start of each DNA segment to be replicated is A. Primase B. DNA polymerase. C. helicase. D. Ligase Which of the following diseases are due to a translocation of a piece of a chromosome from one location to another? A. Acute Myelogenous leukemia B. Down Syndrome C. Cri du chat D. Fragile X syndrome

Solution

8. option B. Gene is the segment of DNA consisting of exons and introns.

9. option D.

10. option B.. Cancer cells do show contact inhibition.

11. option d.

12. D