The movement of water through a membrane is dependent on
a. the concentration of solute.
b. channel proteins.
c. the extent of packing of the phospholipids.
d. active transport.
e. endocytosis.
A
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About 10?15% of African Americans are carriers for ____, an autosomal recessive genetic disorder
where a defective version of hemoglobin is produced.
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell disease e. cystic fibrosis
All of the following are consistent with the law of conservation of matter EXCEPT:
a. there is no such thing as waste. b. matter is neither created nor destroyed but it can change form. c. any matter that is dangerous to living things is quickly biodegraded into a harmless form. d. one organism's waste matter is taken up by another organism and reused.
Skin is sometimes referred to as the largest organ of the body. Why is skin considered to be an organ and not a tissue or some other structure?
A) Skin consists of multiple cell types functioning as a single integrated unit. B) Skin consists of multiple tissue types that cooperate to perform a specific task. C) Skin is a vital component of multiple organ systems. D) Skin consists of a single cell type.
A flower's parts are modified ____ that develop from a receptacle.
A. epidermal cells B. asexual organs C. regions of a stem D. leaves E. ovaries