A tennis player serving the ball uses fast muscle fibers. The ATP needed to accomplish this comes from
A) anaerobic fermentation.
B) aerobic respiration.
C) conversion of lactic acid to ATP.
D) conversion of Ca2+ to ATP.
Answer: A
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The phase at the end of an action potential when the membrane potential becomes more negative than it is at rest is the ________ phase.
A) threshold B) depolarizing C) repolarizing D) hyperpolarizing E) refractory
Which of the following describes a viroid?
a. enveloped viral particle with double-stranded DNA enclosed by a capsid b. infectious proteinaceous particle with no associated nucleic acids c. infectious RNA particle d. a simple prokaryote with only a membrane and a nucleoid region
The type of RNA that directs protein synthesis is referred to as what?
a. ribosomal RNA b. microRNA c. messenger RNA d. transfer RNA e. translation RNA
Which of the following lycophytes is not properly matched to its description?
A. lycopodium: grow low to the ground, have branching stems and leaves that grow in a helical pattern B. selaginella: leaves are held in a single plane giving their branched stems a distinctive appearance; many grow as epiphytes C. quillworts (isoetes): small plants that live along the margins of lakes and streams D. tree-sized lycophytes: possess a vascular cambium; these can still be found today in tropical forests in Africa