Coastal regions where seawater mixes with fresh water from rivers, streams, and runoff are called
____.
a. neritic zones
b. estuaries
c. benthos
d. wetlands
e. intertidal zones
B
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Eukaryotic genes are organized into operons
Indicate whether the statement is true or false.
What is the first step of DNA replication?
a. The DNA helix unwinds. b. The DNA polymerase adds nucleotides. c. RNA primers are removed. d. DNA fragments join ligase.
Steroids
a. have no fatty-acid component. b. consist of four rings. c. may have different numbers, types, and positions of functional groups attached to them. d. are a specialized type of lipid. e. are described by all of these
A protein that is normally localized in the cytoplasm has been engineered so that it will be secreted from the cell instead. Which of the following represents the most likely pathway for the protein after it has been completely synthesized?
A) rER ? Golgi ? secretory vesicle ? environment B) rER ? Golgi ? sER ? cytoplasm ? environment C) cytoplasm ? rER ? Golgi ? secretory vesicle ? environment D) sER ? Golgi ? secretory vesicle ? environment E) rER ? secretory vesicle ? Golgi ? environment