In a food web, which of the following organisms would be considered heterotrophs? Select all that apply
A. decomposers
B. consumers
C. primary producers
D. secondary consumers
A,B,D
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Describe the various structures on the aboral “spiny skin” of a sea star and discuss their functions.
What will be an ideal response?
Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
CO2 and H2O will not form glucose on their
own because a. CO2 does not contain sufficient energy. b. H2O does not contain sufficient energy. c. neither CO2 nor H2O contain sufficient energy. d. the concentration of CO2 is too low in the atmosphere. e. the bonds of CO2 and H2O are too stable to be broken without an input of energy.
How many carbon dioxide molecules are produced by the complete aerobic breakdown of one glucose molecule via glycolysis and the Krebs cycle?
a) 2 b) 3 c) 4 d) 5 e) 6