The condition of having no sperm in the semen is called ____________________. Fill in the blank(s) with the appropriate word(s)
azoospermia
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Najash is an extinct fossil species that has distinct functional pelvis and hindlimbs. Choose the best answer which explains this in evolutionary theory.
A. Najash hindlimbs and pelvis bones represent vestigial structures in that species.
B. Najash was an evolutionary dead end, since no other snake species has anything but vestigial structures.
C. Najash shares homologous features with other vertebrates, such as reptiles.
D. Najash is a transitional species, that has not yet lost its pelvis and hindlimbs.
E. Najash is both a transitional species, and shares homologous structures with other vertebrates, such as reptiles.
A bacterium that you isolated from pond water appears to use light for energy. Based upon this information, you inoculate the organism into fresh media, infused with lots of carbon dioxide. Even after incubation at the correct temperature (of pond water), the organism is not growing. Your best explanation of what might have happened is
A. there was no sulfur compound added to the medium, that could be used as an electron donor. B. there is some inhibitory chemical that is preventing the growth of the bacterium. C. you were using the wrong type of sunlight as the energy source for the bacterium. D. no oxygen was added to the medium so the organism died.
In mitosis, _____
a. the chromosome number is halved b. the chromosome number is doubled c. the chromosome number stays the same d. the chromosome number may double or be halved depending on the species e. gametes are formed
The Pacinian corpuscle is used in detecting ____
a. sound b. hard pressure c. chemicals d. light touch e. chemical differences