The nervous system of many species of flatworms
a. consists of a single, large ganglion in the anterior end.
b. is sometimes referred to as tubelike.
c. includes two dorsal nerve cords.
d. is diffuse and netlike.
e. is a “ladder-type.”
e
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The type strain is a well-characterized strain to which other strains are compared for inclusion in or exclusion from a particular species.
Answer the following statement true (T) or false (F)
If a female fruit fly is heterozygous and carries one allele for white eyes and one allele for red eyes, her mutant allele and her nonmutant allele will segregate during meiosis I
A. true B. false
You wanted to test a single fruit fly for the presence of the TOLL protein , so you prick it with a needle coated in fungal spores. The fly dies 2 days later. Which of the following statements is TRUE?
A. This is evidence that the TOLL protein is present. B. This is evidence that the TOLL protein is not present. C. The TOLL protein is only found in humans. D. This is inconclusive evidence.
Which statement about autotrophs is true?
a. Photoautotrophs are the most common ecosystem energy source. b. Chemoautotrophs depend on sunlight to generate energy. c. Photoautotrophs consist primarily of bacteria and archaea. d. Chemoautotrophs are typically found in grazing food webs.