Researchers in Alaska were interested in increasing the sockeye salmon (Oncorhynchus nerka) population in three coastal lakes. To accomplish this, the ponds were treated with fertilizers. As a result, zooplankton biomass increased between 40% and 700% in the three lakes. The substantial growth in zooplankton would suggest that prior to these experiments, these lakes were ________.
A. eutrophic
B. oligotrophic
C. subject to low light levels
D. stratified
Answer: B
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The amoebozoa that are parasitic for humans are the
A) gymnamoebas. B) radiolarians. C) entamoebas. D) oomycetes.
The main evolutionary advantage of sexual over asexual reproduction is that it produces _____
a. more offspring per individual b. more variation among offspring c. healthier offspring
Lacunae are
a. spaces inside a bone cell. b. the places where marrow is located. c. the location of the contractile units of muscle. d. spaces within the matrix. e. found only within cartilage.
Some restriction enzymes create blunt DNA ends, without the complementary single-stranded overhangs of sticky ends. What is the advantage of using restriction enzymes that create sticky ends vs. blunt ends for creating recombinant
DNA molecules? What will be an ideal response?