The high variability of the types of G protein-coupled receptors allows for:
A. different types of cells to respond to
different types of signals.
B. different types of signal-transduction
pathways to respond to signals.
C. a rapid response to cell signals.
D. a sensitive response to cell signals.
E. All of these choices are correct.
A
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How can the preservation of biological diversity be justified? Check all that apply.
_____ ethical grounds. _____ supernatural responsibility. _____ economic value. _____ ecological value. _____ exploitative value.
Barringer Crater in Arizona was formed when a 300,000-ton asteroid slammed into Earth 50,000 years ago. Which
statement accurately depicts this event? a. The asteroid hit so early that it had little influence on the history of life. b. The asteroid produced about 150 times the energy of the bomb that hit Hiroshima. c. The impact of the asteroid resulted in a minor crater. d. The cause of the crater has been determined by examining fossils found at the site. e. The impact of the asteroid released only minor amounts of energy
Which of the following statements about mitochondria is false?
A) Because of the role of the mitochondria in producing cellular energy, mitochondrial diseases often affect the muscles and nervous system. B) Because mitochondria are present in the cytoplasm, mitochondrial diseases are transmitted maternally. C) Like nuclear genes, mitochondrial genes usually follow Mendelian patterns of inheritance. D) Mitochondria contain circular DNA molecules that code for proteins and RNAs. E) Many mitochondrial genes encode proteins that play roles in the electron transport chain and ATP synthesis
The inflammatory response associated with certain allergies is a result of ________ degranulation
a. neutrophil b. mast cell c. lymphocyte d. monocyte