Senescence in plants usually involves
A) the presence of cytokinins.
B) the development of photosynthetic enzymes.
C) the formation of an abscission layer.
D) shade from other plants.
E) apical dominance.
C
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What molecules in the spliceosome catalyze the intron removal reactions?
A) RNA polymerases B) ribozymes C) tRNA D) introns
Which event can introduce a protein domain into a pre-existing protein?
a. gene alignment b. intron shuffling c. exon shuffling d. peptide shuffling e. exon splicing
A sensillum is
a. a hollow hair-like tube characterized by a pore on the end and multiple chemoreceptor cells inside. b. located on the antennae, foot, or mouthparts of aquatic insects. c. a specialized smell receptor in invertebrates. d. common to earthworms, insects, and cnidarians. e. a type of taste receptor in vertebrates.
Based on what we know today, what is the best explanation for why the emu, ostrich, and rhea are so
similar despite being geographically separated? What will be an ideal response?