Chloroplasts of red algae may have evolved from ancient endosymbiotic ____
a. cyanobacteria
b. dinoflagellates
c. apicomplexans
d. archaeans
e. nitrifying bacteria
ANSWER: a
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Food intoxication usually has a shorter incubation period than food-borne infection.
Answer the following statement true (T) or false (F)
The original impetus to sequence the human genome was to investigate
A) how the four nitrogenous bases encode information. B) how people vary. C) how cancer arises. D) the effects of exposure to low-level radiation on the genetics of populations.
When analyzing octads (ordered tetrads), second-division (MII) segregations result from
A) single crossovers between linked genes. B) double crossovers between linked genes. C) single crossovers between a gene and a centromere. D) independent assortment of unlinked genes. E) nondisjunction of homologs.
The environmental contribution to bipolar disorder is most likely, at least in part, based on
_____________. A. prenatal exposure to toxic chemicals B. overexposure to UV light C. mutagens that damage DNA repair enzymes D. epigenetic changes involving methylation and demethylation E. childhood abuse