The semipermeable structure controlling the transport of materials between the cell and its external environment is the:
A) cell membrane.
B) cell wall.
C) cytoplasm.
D) nuclear membrane.
A) cell membrane.
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Restriction fragment length polymorphisms are used to
a. test the effectiveness of different restriction enzymes on a sequence of DNA. b. compare the DNA sequences between individuals by looking for changes in restriction enzyme digest patterns. c. compare DNA sequences by determining the full DNA sequence. d. prepare DNA for further sequence analysis. e. treat sickle-cell anemia.
During resting breathing in humans, which of the following is accurate?
a. The diaphragm contracts and the internal intercostal muscles relax. b. The diaphragm relaxes and the internal intercostal muscles contract. c. The diaphragm contracts and the internal intercostal muscles contract. d. The diaphragm relaxes and the external intercostal muscles contract. e. Rib muscles and the diaphragm relax.
What is true about the genus Sphagnum?
A) It is an economically important liverwort. B) It grows in extensive mats in grassland areas. C) It accumulates to form coal and is burned as a fuel. D) It is an important carbon sink, reducing atmospheric carbon dioxide.
In what way are lysosomes and plant vacuoles similar to each other?
a. They are both involved in cell movement. b. They are both involved in cell digestion. c. They are both involved in cell sensitivity. d. They are both involved in cell reproduction.