Mitochondrial disorders are probably very rare because
A) people have many mitochondria, so the healthy ones can substitute for the affected ones.
B) the oocytes with harmful mitochondrial mutations do not have sufficient energy to survive.
C) they are difficult to diagnose because most physicians have forgotten what mitochondria are.
D) they are not inherited from the father.
B) the oocytes with harmful mitochondrial mutations do not have sufficient energy to survive.
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In regions where malaria is prevalent, the S allele is beneficial because:
A. it improves the ability of the hemoglobin to carry oxygen. B. it improves the ability of the immune system to fight Plasmodium, the parasite that causes malaria. C. it causes red blood cells to distort, which makes them less hospitable to Plasmodium, the parasite that causes malaria. D. it prevents mosquitoes from releasing Plasmodium, the mosquito that causes malaria, into the blood. E. None of the answer options are correct.
Plasmolysis occurs in plant cells when the soil or water contains low concentration of salts or fertilizers
__________________ Indicate whether the statement is true or false.
Air flow into and out of the lungs is an example of
A) bulk flow. B) facilitated diffusion. C) active transport. D) osmosis. E) diffusion.
The skin plays a key role in thermoregulation, or the regulation of body temperature. Which structures are involved in this process?
The sebaceous glands Dermal blood vessels and sweat glands Melanin, sebum, and keratin All of the above