California's native golden trout declined after European brown trout and eastern brook trout were introduced into California's mountain streams for sport fishing. This is an example of what type of threat?
a. overharvesting
b. commercial sporting
c. invasive species
d. endemic species
e. habitat destruction
c
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Polyploid plants tend to produce fewer fruits and flowers, be smaller in size, and not adapt as well to extreme environmental conditions as normal varieties
Indicate whether the statement is true or false
Which codons are synonymous?
A) CAC and CAG B) CAC and CAU C) ACA and AGC D) UCC and GAC
Which sequences would likely have both a nucleosome-depleted region (NDR) and a poly A/T tract to attract transcriptional activators to a transcription start sequence?
A) chromatin modifiers B) enhancers C) open promoters D) closed promoters E) insulators
Scientists unearth a Wooly Mammoth from the Siberian Ice Sheath and discover that a eukaryotic "amoeba"-like cell is still alive. Which component of the cell membrane might contribute to maintaining the fluidity of plasma membranes under freezing conditions?
A. high levels of saturated phospholipid tails within the lipid bilayer B. high levels of long phospholipid tails within the lipid bilayer C. absence of cholesterol D. high levels of unsaturated phospholipid tails within the lipid bilayer E. peripheral proteins