What is the major disadvantage of an exoskeleton?
A) It hardens only after an extended exposure to air.
B) It does not provide effective support for muscles.
C) It does not protect the internal organs.
D) It must be periodically shed for growth to occur.
D
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Irises and other ____ plants flower only when the hours of darkness fall below a critical value, typically in summer
a. short-day b. long-day c. annual d. biennial e. perennial
Lichens are symbiotic relationships established
between a. a club fungus and a green alga. b. a club fungus and a cyanobacterium. c. sac fungi and green algae. d. sac fungi and cyanobacteria. e. sac fungi and green algae or cyanobacteria
Which tRNA anticodon sequence is the correct match to the mRNA codon listed below? Note: codon-anticodon base-pairing is antiparallel. 5'-CGA-3'
A) 3'-CGA-5' B) 3'-TCG-5' C) 3'-GCT-5' D) 3'-GCU-5'
The biggest difference in gene functions between unicellular and multicellular eukaryotes is in the proportion of genes for
a. intracellular functions only. b. extracellular functions only. c. transmembrane functions only. d. extracellular and transmembrane functions. e. intracellular, extracellular, and transmembrane functions.