Contractile vacuoles
A) are generally found in protists that inhabit salt water.
B) help in the excretion of excess salt.
C) prevent cells from bursting as a result of the influx of excess water.
D) allow organisms to avoid dehydration by absorbing water from the environment.
Answer: C
You might also like to view...
Where do exocytic secretory vesicles originate?
a. endoplasmic reticulum b. plasma membrane c. the Golgi complex d. lysosomes e. microbodies
For most multicellular eukaryotes, including humans, mitochondria are inherited ____
a. only from the father b. from both the father and the mother c. from the mother for female offspring and from the father for male offspring d. randomly from either the father or the mother e. only from the mother
Which of the following enzymes protect microbes against toxic oxygen (O2) products?
A) Catalase B) Permease C) Hydrolase D) All of the above
Which statement about proto-oncogenes is false?
A) Proto-oncogenes are normal genes with the potential to become oncogenes. B) Many proto-oncogenes code for growth factors. C) A mutation must occur in a cell's DNA for a proto-oncogene to become an oncogene. D) If a proto-oncogene's gene product is produced in smaller quantities, a cell may become cancerous.