On a trip to the beach, you find a multicellular organism whose cells have chloroplasts and cell walls. Based on this description, you know that the organism could be a brown alga, a red alga, a green alga, or a land plant washed into the ocean. The presence of which of the following would allow you to definitively identify this organism as a plant?
A) Multicellular embryo
B) Starch
C) Cellulose
D) Alternation of generations
E) Chlorophyll a
A
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What is the nutrient cycle in nitrification?
a. Nitrogen, nitrate, nitrite b. Ammonia, nitrite, nitrate c. Ammonia, nitrate, nitrite d. Ammonia, nitrogen, nitrite
Peptide bond formation is catalyzed by an RNA molecule in
A) prokaryotes. B) eukaryotes. C) viruses. D) archaea. E) both prokaryotes and eukaryotes.
____ is NOT an event of telophase.
A. Uncoiling of chromosomes B. Disappearance of spindles C. Nuclear membranes forming to create daughter nuclei D. Breaking down of nucleoli
What change(s) can have detrimental effects on the human food supply?
a. 10%–35% of all U.S. crops are lost to insect damage each year. b. $10 billion per year are spent on insecticides by American farmers. c. Natural selection can create an "arms race" between pest species that feed on crops and pesti-cides developed by humans. d. All of the above.