Chum salmon (Oncorhynchus keta) are born in freshwater environments and then migrate to the sea. Near the end of their lives, they return to the freshwater stream where they were born to spawn
In freshwater, water constantly diffuses into the body and ions are lost from the body. In salt water, body water diffuses out of the body and excess ions are gained from the water. A salmon's gills have special cells to pump salt in or out of the body to maintain homeostasis. In response to the salmon's moves between freshwater and salt water, some cells in the gills are produced and others are destroyed. These changes made in the cells of the gills during the lifetime of an individual salmon are an example of which of the following? A) evolution
B) trade-off
C) acclimatization
D) adaptation
C
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Is produced along with water at the end of normal cellular respiration.
A) Cristae B) Electron transport chain C) Microtubules D) Glycolysis E) Flagella F) Plasma membrane G) Citric acid cycle H) ATP
Tissues present during organ development that are not found in the fully formed organ are removed by ____
a. apoptosis only b. differentiation only c. induction only d. apoptosis and differentiation e. apoptosis, differentiation, and induction
In female mammals, most genes on one of the two X chromosomes are permanently inaccessible, a phenomenon is
called __________. Fill in the blank(s) with the appropriate word(s).
The duplication of a cell's DNA is called
A) Mitosis B) Translation C) Replication D) Mutation E) Transcription