Which of the following has the largest genome and the fewest genes per million base pairs?
a) Homo sapiens (human)
b) Haemophilus influenzae (bacterium)
c) Drosophila melanogaster (fruit fly)
d) Arabidopsis thaliana (plant)
e) Saccharomyces cerevisiae (yeast)
Answer: a) Homo sapiens (human)
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The greatest number of pathogens enter the body through the ________.
A. skin B. respiratory system C. gastrointestinal system D. urinary system E. genital system
Why might the sex ratio of bird species in the figure change from as they grow from juveniles to adults?
A) Nesting females are vulnerable to predatory attack. B) Males that are unable to mate die quickly. C) Females are less able to feed effectively as juveniles. D) More females are required to sustain the population.
Identify the organisms that belong to the phylum that are included in the Deuterostomia.
A. tapeworms and mollusks B. sea stars and crocodiles C. octopuses and sea stars D. polychaetes and roundworms E. blood flukes and crustaceans
What initiates the formation of an endospore?
A) stimulus to reproduce B) transfer of genetic material C) injury to the cell D) depletion of nutrients