A promoter and a set of operators that control access to two or more genes is a(n) _____
a. lactose molecule
b. operon
c. dosage compensator
d. knockout
B
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As shown in Figure 25.1 (and reproduced here), atmospheric CO2 levels oscillate over the course of the year. What season would you expect oxygen levels to be highest?
A. summer B. fall C. winter D. spring
There are exceptions to the general rule that amphibians lay eggs that develop in the water. These exceptions showed extreme variation but they do have one thing in common. What is it?
A. They all develop in some sort of pouch. B. They all develop in desert environments. C. They all develop in habitats with adequate humidity. D. They all develop in a camouflaged environment. E. They all develop more slowly than eggs developed in water.
The principle of independent assortment states that
a. one allele is always dominant to another. b. hereditary units from the male and female parents are blended in the offspring. c. the two hereditary units that influence a certain trait segregate during gamete formation. d. each hereditary unit on one chromosome is inherited separately from hereditary units on other chromosomes. e. genes on the same chromosome travel separately.
Myelogenous leukemia is caused by a mutant tumor-suppressing gene. Indicate whether the statement is true or false