Which of the following represents a pair of homologous structures?
A) the wing of a bat and the scales of a fish
B) the wing of a bird and the front legs of a horse
C) the antennae of an insect and the eyes of a bird
D) the wing of a bat and the wing of a butterfly
Answer: B
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The ovary is most often located in the _____
A) stamen B) carpel C) petals D) sepals E) receptacle
To promote the translational activity of ribosomes in human cells for synthesizing viral proteins during viral infection, viruses
A) chemically modify (e.g., cap and methylate) the transcripts. B) keep a ribosome binding site specific to human ribosomes on their genome. C) maintain introns and sometimes extrons in their genomes to appear as eukaryotic mRNA. D) only adhere to and infect metabolically active host cells where protein synthesis is high.
Which of the following functional groups form symbiotic relationships with Eukaryotes in deep sea environments?
A) dissimilatory iron-oxidizers B) methanotrophs C) sulfide-oxidizers D) methanotrophs and sulfide-oxidizers
The unequal distribution of acid rain over the United States is closely correlated with
a. per capita energy use. b. fertilizer use. c. burning fossil fuels for energy production. d. average summer temperatures. e. mountain ranges.