Question

multiple choice 20 marks select the letter that best completes the statement or answers each of the questions and place it on the answer sheet. 1. what is the proper order for the stages of mitosis, from earliest to latest? a. prophase, prophase, anaphase, telophase b. prophase, metaphase, anaphase, telophase c. telophase, metaphase, anaphase, prophase d. prophase, metaphase, telophase, anaphase 2. which phase of the cell cycle is depicted in the diagram below? a. metaphase ⑤ telophase b. anaphase d. prophase diagram of a cell with spindle fibers and chromosomes 3. which of the following statements is false regarding embryonic stem cells? a. the embryo must be destroyed in order to obtain large numbers of embryonic stem cells. b. the embryo must be created and incubated in a laboratory setting. c. they specialize to become cells from their tissue of origin. d. they can undergo differentiation to become any type of human cell. 4. many chemicals in cigarette smoke are carcinogenic. what does this mean? a. the chemicals are found in cigarettes as well as in many other artificial sources. b. the chemicals are toxic to cells they come into contact with. c. the chemicals are found in cigarettes as well as in many other natural sources. d. the chemicals can cause cancer in cells they come in contact with. 5. the cell theory is a list of ideas that describe the functions and importance of cells in living organisms. which of the following statements is not a part of the cell theory? a. cells can form from non - living matter. b. cells are the smallest unit of life. c. all living things are made of one or more cells. d. cells divide to make copies of themselves.

Explanation:

1. The stages of mitosis in order are prophase (chromosomes condense), metaphase (chromosomes align at equator), anaphase (sister chromatids separate), telophase (nuclei reform).
2. The diagram shows chromosomes aligned at the cell's equator, a key feature of metaphase.
3. Embryonic stem cells are pluripotent (can differentiate into any cell type), require embryo destruction for large-scale extraction, and are created in labs; they do not specialize in their tissue of origin (that describes adult stem cells).
4. Carcinogenic substances are defined as those that cause cancer.
5. Cell theory states cells come from pre-existing cells, not non-living matter.

Answer:

1. B. prophase, metaphase, anaphase, telophase
2. A. metaphase
3. C. They specialize to become cells from their tissue of origin.
4. D. The chemicals can cause cancer in cells they come in contact with.
5. A. Cells can form from non-living matter.