The transformation frequency of very competent cells is about 10-6, or about 1 in 1,000,000 when an excess of DNA is used.
Answer the following statement true (T) or false (F)
False
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Does the average mutation rate in humans accurately describe the pattern of mutations across the genome? Select all that apply
A. No. Some sites (hotspots) are more mutable than others. B. No. Mutation rates differ between males and females. C. No. Mutation rates differ between germ cells and somatic cells. D. No. Mutations rate vary with age. E. No. Mutation rates vary with location - they are higher in some parts of the world than in others.
Female fireflies identify males by their flashing patterns, which are often so complicated that signals sent by one
species cannot be understood by another species. This reproductive isolating mechanism is called ____.v
a. ecological isolation b. gametic isolation c. temporal isolation d. behavioral isolation e. mechanical isolation
Which fungal lineage is the oldest?
a. Deuteromycetes b. Chytrids c. Glomeromycetes d. Zygomycetes e. Ascomycetes
Which structure conducts electrical signals from the apex of the heart to the ventricular myocardium, causing the ventricles to contract?
a. arterioles b. sinoatrial node c. Purkinje fibers d. atrioventricular node