A flower that lacks one or more of the four types of modified leaves is referred to as ____
a. perfect
b. imperfect
c. complete
d. incomplete
e. irregular
ANSWER: d
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A gene that, when mutated, leads to organisms with structures in abnormal places is termed
A. vestigial. B. dominant. C. homeotic. D. parsimonious. E. homologous.
In genomic libraries, DNA fragments are stored in ______________ chromosomes. Fill in the blank(s) with the appropriate word(s)
Which of the following series of events is associated with the formation of cancer?
A. The oncogenes mutate and become proto-oncogenes which are continuously active. There is also an associated loss of tumor suppressor gene activity allowing uncontrolled growth of cells. B. The proto-oncogenes mutate and become oncogenes which are continuously active. There is also an associated loss of tumor suppressor gene activity allowing uncontrolled growth of cells. C. The proto-oncogenes mutate and become oncogenes which stop functioning altogether. There is also an associated increase in the tumor suppressor gene activity allowing uncontrolled growth of cells. D. The oncogenes mutate and become proto-oncogenes which stop functioning altogether. There is also an associated increase in the tumor suppressor gene activity allowing uncontrolled growth of cells.
Place the following events in the order in which they occur when cells stop dividing at a G1 checkpoint after the cells have been irradiated.
1. Production of p21. 2. DNA damage. 3. Inactivation of cyclin-Cdk complex. 4. Activation of p53. 5. Activation of ATM/ATR A. 1-2-3-4-5 B. 2-5-4-1-3 C. 2-5-1-3-4 D. 5-4-3-2-1