Answer the following statements true (T) or false (F)
1. When lactose becomes available the genes encoding ?-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. Bacteria can regulate gene expression by controlling the rate at which mRNA is translated into protein.
4. Small effector molecules directly bind the DNA they regulate.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
You might also like to view...
What enzyme catalyzes the attachment of amino acids to tRNA molecules?
A. helicase B. topoisomerase C. aminoacyl-tRNA synthetase D. ribosome E. translation factor
Which of the following is common to both meiosis and mitosis?
a. DNA replication must occur prior to these divisions. b. Homologous pairs must form. c. Cytokinesis occurs twice. d. The chromosome number does not change
Stephanie is infected with a pathogen. How might it be determined if the pathogen is a virus
or a bacterium?
a. A virus does not have genetic material such as DNA or RNA. b. A bacterium has ribosomes, but a virus does not. c. A virus does not have an outer covering or capsule. d. Bacteria are eukaryotes, and viruses are prokaryotes.
Refer to the accompanying figure with the lateral line organs of fishes. The structures indicated by label 3 are:a
hair cells. b. cupula. c. stereocilia. d. sensory neurons. e. supporting cells.