10,000 kcal of producer could support approximately how many kcal of tertiary consumer?
a. 1,000
b. 100
c. 10
d. 1
e. 0
Ans: c. 10
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The directional growth response of plants to touch is called
A. phototropism. B. gravitropism. C. thigmotropism. D. photoperiodism. E. thermotropism.
Using the genetic code shown here, predict what type of mutation has occurred in the hemoglobin sickle-cell anemia allele.
Normal allele 5'–GGAAUGAAACAGGAACCC–3'
Mutant allele 5'–GGAAUGAAACAGGUACCC–3'
A. a point mutation, Val to Glu
B. addition of a new stop codon
C. a frameshift mutation
D. a point mutation, Glu to Val
E. a silent mutation
If the codon is CCA, what is the anticodon and what amino acid will be inserted?
A. ACC, threonine B. CCA, proline C. GGU, proline D. UGG, tryptophan E. GGT, glycine
Which of the following statements about xylem is incorrect?
A) It conducts material from root tips to leaves. B) The conducting cells are part of the apoplast. C) It transports mainly sugars and amino acids. D) It typically has a lower water potential than is found in soil. E) No energy input is required for transport.