If the flow of energy in an arctic ecosystem goes through a simple food chain, perhaps involving humans, starting from phytoplankton to zooplankton to fish to seals to polar bears, then which of the following could be true?
A) Polar bears can provide more food for humans than seals can.
B) The total biomass of the fish is lower than that of the seals.
C) Seal meat probably contains the lowest concentrations of fat-soluble toxins.
D) Seal populations are larger than fish populations.
E) Fish can potentially provide more food for humans than seal meat.
Answer: E
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A) chloroplasts in algae / chloroplasts in plants B) mitochondria in eukaryotes / chloroplasts in eukaryotes C) chloroplasts and mitochondria in plants and red and green algae / chloroplasts in other eukaryotes D) chloroplasts and mitochondria in green and red algae / chloroplasts and mitochondria in diatoms
In their experiments to identify the transforming principle, Avery, MacLeod, and McCarty used enzymes that break
down ____.
a. protein, DNA, and RNA b. protein and RNA only c. DNA only d. protein, lipids, and RNA
e. lipids and DNA onlyWhich single event is probably common to all occurrences of speciation?
What will be an ideal response?
How does the speed of division in normal cells and blastema cells differ?
a. Blastema cells divide 50 times faster than normal cells. b. Blastema cells divide 40 times faster than normal cells. c. Blastema cells divide 20 times faster than normal cells. d. Blastema cells divide at the same speed as normal cells.