The term angiosperm refers to
A. the presence of pollen.
B. the narrow sperm of angiosperms.
C. the presence of endosperm.
D. the branching of vascular veins.
E. the enclosure of the seed within a fruit.
Answer: E
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The persistent survival of microorganisms on a surface of the human body is called a(n):
a. infection. b. colonization. c. nosocomial infection. d. reservoir.
While a eukaryotic pre-mRNA is still being synthesized it is modified on its 5' end when
a. exon shuffling mixes mRNA pieces. b. enzymes recognize a polyadenylation signal in the trailing RNA sequence. c. the RNA introns are cut out by the spliceosome. d. an enzyme adds a guanine-containing cap. e. the RNA exons are spliced together.
The position of mammals in evolution is best described as
A. they dominate life in the sea. B. they arose from mammal-like reptiles in the Jurassic but remained small and insignificant while dinosaurs dominated the land. C. mammals gave rise to birds. D. they were among the first animals to live on land and their diversity is greater than all living things known. E. All of the choices are correct.
The "motor unit" in vertebrate skeletal muscle refers to _____
A) one actin binding site and its myosin partner B) one sarcomere and all of its actin and myosin filaments C) one myofibril and all of its sarcomeres D) one motor neuron and all of the muscle fibers on which it has synapses