Which statement about amoebas is false?
a. Most amoebas are predators in freshwater habitats
b. Some amoebas live in the guts of animals.
c. Amoebas live as single cells.
d. No species of amoeba is pathogenic.
d
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What do you know about signaling involved in cancer growth? What other information is related to the question?
What will be an ideal response?
Fifteen different strains of bacteria are auxotrophic for maltose and their mutations do not complement each other. The mutations in these bacteria map to the same DNA region using transformation of random fragments of genomic DNA. Only two different enzymes participate in the maltose biosynthetic pathway, and the genes for both are within a single operon. What does this data suggest?
A) There are fifteen enzymes in maltose metabolism. B) All the strains have mutations that prevent transcription of the operon. C) Fifteen genes encode maltose biosynthesis enzymes, but only two genes are crucial. D) Maltose is the preferred sugar source for the mutant bacteria.
The respiratory surface of an earthworm is
found in the
a. lungs. b. gills. c. skin. d. gastrovascular cavities. e. trachaea
The binding signal recognition particle to the nascent peptide______ protein synthesis
Fill in the blank(s) with the appropriate word(s).