The ultimate source of energy for humans comes from what source?
A. air
B. water
C. the sun
D. plants
E. animals
Answer: C
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Bacteria in the phylum ________ occur as elementary or reticulate bodies depending on their life cycle stage, are obligate intracellular parasites, and also have relatively small genomes
A) Bacteroidetes B) Chlamydiae C) Planctomycetes D) Rickettsia
Which one of the following can lead to changes in chromatin structure and is often associated with activation of transcription?
A. methylation of RNA polymerase B. addition of methyl or acetyl groups to lysines located in the histone tail C. methylation or acetylation of the phosphodiester link between cytosine and guanine D. addition of lysine to CpG sites along the histone tail E. the presence of cytosine and guanine in a repeating sequence in the histone tail
Human males and females are roughly equivalent in terms of gene expression from the X chromosome because
A) one of a female's two X chromosomes is inactivated. B) males only have one X chromosome. C) one X chromosome is inactive in male cells. D) males are hemizygous.
What invention about 11,000 years ago led to a
boom in the human population?
a. the wheel b. agriculture c. the printing press d. the steam engine e. all of these