Biotechnology 2nd Edition by David P. Clark – Test Bank

Chapter 1: Basics of Biotechnology

1. Which of the following statements has no bearing on cancer?
   1. As cancer develops, at least two mutations are required.

*b. Mutations on embryonic development are very deleterious.

1. For microtumors to continue growing, angiogenesis is required.
2. Somatic mutations after the organism reaches maturity may be involved in cancer.

2. Which of the following statements about causes of cancer is NOT true?
   1. Cancer-causing agents are called carcinogens.
   2. Cancers occur more often in tissues that have growing, dividing cells.

*c. Nerves and muscles grow quickly and account for more than half of all cancers.

1. Cigarettes, harmful chemicals, and nuclear radiation may all contribute to cancer.
2. Carcinogens are also usually mutagen

3. Which of the following happens during the G1 phase of the cell cycle?
   1. Externals factors that bind to receptors and promote synthesis of cyclin D
   2. The phase of cell cycle when DNA is replicated and chromosomes are duplicated.

*c. During this phase of cell cycle, the cell increases in size.

1. G1 factors prevent the ending of M phase

4. Which of the following happen during the S phase of the cell cycle?
   1. Externals factors that bind to receptors and promote synthesis of cyclin D

*b.The phase of cell cycle when DNA is replicated and chromosomes are duplicated.

1. During this phase of cell cycle, the cell increases in size.
2. G1 factors prevent the ending of M phase

5. Cyclin-dependent kinases are

*a. Factors that bind to cyclin, and then phosphorylate other proteins to initiate the next phase of the cell cycle

1. External factors that bind to receptors and promote synthesis of cyclin D
2. Proteins that removes phosphates from cyclins and prevents the cell cycle from progressing
3. All of the above are correct