An identifying structural characteristic of phloem is ________
a. mesophyll
b. vessels of dead cells
c. tracheids
d. sieve tubes
d
Biology & Microbiology
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Researchers have found that mixtures of phospholipids placed in water or salt solutions tend to spontaneously form:
A. RNA molecules. B. DNA molecules. C. ATP. D. small spherical units that resemble living cells.
Biology & Microbiology
Hagfishes have three-chambered hearts, which improve gas exchange with the lungs
Indicate whether the statement is true or false
Biology & Microbiology
Inhibition of an enzyme is irreversible when
A) a competitive inhibitor is involved. B) a noncompetitive inhibitor is involved. C) there is an abundance of substrate. D) covalent bonds form between inhibitor and enzyme.
Biology & Microbiology
Homologous genes in different species are called
A. analogs. B. dialogs. C. monologs. D. paralogs. E. orthologs.
Biology & Microbiology