Which type of microscopy has the greatest resolving power?
A) electron
B) phase-contrast
C) fluorescence
D) digital video
E) confocal scanning
A) electron
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A ______ is a regulatory molecule that is secreted into the blood by an endocrine gland.
A. metabolite B. hormone C. peptide D. G protein E. neurotransmitter
What can you conclude from these data?
Consider the pathway for the synthesis of the amino acid arginine in Neurospora:
Mutant strains of Neurospora may carry one or more mutations. Neurospora mutant strain b is grown on minimal media plus supplements as shown. Growth is shown by (+) and no growth is shown by (o).
A) Strain a has only one mutation and it is in ARG-E.
B) Strain b has only one mutation and it is in ARG-H.
C) Strain a has a mutation in ARG-F and strain b has a mutation in ARG-E.
D) Strain b has mutations in ARG-E, ARG-F, and ARG-H.
In which of the following ways do cycads and
ginkgos differ from conifers?
a. cycads and ginkgos have flagellated sperm; conifers do not have flagellated sperm b. conifers have microspores and megaspores; cycads and ginkgos have only one type of spore c. cycads and ginkgos form fruits; conifers do not d. conifers form seeds on the surface of the ovules; cycads and ginkgos form seeds in enclosed structures e. conifer form seeds from female gametophytes; cycads and ginkgos form seeds from male gametophytes
Gap junctions in plant cells can close
a. true b. false