Which type of microscopy has the greatest resolving power?

A) electron
B) phase-contrast
C) fluorescence
D) digital video
E) confocal scanning


A) electron

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Gap junctions in plant cells can close

a. true b. false

Biology & Microbiology