Answer the following statements true (T) or false (F)
1. When lactose becomes available the genes encoding b-galactosidase and lactose permease are upregulated in E. coli.
2. Different globin polypeptides are expressed at similar levels during the embryonic and fetal stages of mammalian development.
3. Small effector molecules directly bind the DNA they regulate.
4. Both eukaryotes and prokaryotes require a promoter region for gene transcription.
5. A cis-effect is a form of gene regulation that can occur between two DNA segments that are not physically adjacent.
1. TRUE
2. FALSE
3. FALSE
4. TRUE
5. FALSE
You might also like to view...
Which of the following is a difference between chlorophyll a and chlorophyll b?
A) Chlorophyll a is a pigment, and chlorophyll b is the enzyme that transfers excited electrons from chlorophyll a to electron carriers of the thylakoid membrane. B) Chlorophyll a absorbs yellow light, and chlorophyll b absorbs green. C) Chlorophyll a contains magnesium in its ring structure, whereas chlorophyll b contains iron. D) Chlorophyll a and b absorb light energy at slightly different wavelengths.
Examples of mollusks that live on land are the
A. earthworms. B. land crabs. C. mussels. D. scorpions. E. snails and slugs.
Halophytic plants have adapted to the constantly changing salinity in _______ by developing filters in their roots that remove salts.
a. coral reefs b. rivers and streams c. lakes and ponds d. estuaries
The semilunar valves are located between the
a. left and right atria. b. left ventricle and left atrium. c. both ventricles and the arteries that lead away from them. d. right atrium and right ventricle. e. left and right ventricles.