How do earthworms improve soil conditions?
What will be an ideal response?
Earthworms are scavengers that eat their way through the soil and digest organic debris. The worms improve soil by loosening its particles and by excreting tiny bits of organic matter that decomposers can easily break down. Excreted earthworm "castings" are sold as a natural fertilizer.
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How can two cells in the same complex multicellular organism have different fates?
A. Different genes are activated and repressed in the two cells. B. Different DNA sequences are found in the nuclei of the two cells. C. Different amounts of DNA are found in the nuclei of the two cells. D. Different types of transcription and translation machinery are found in the two cells. E. All of these options are correct.
Synaptic vesicles are synthesized in the nerve ________.
Fill in the blank(s) with the appropriate word(s).
Which of the antibody classes is able to destroy an antigen by activating the nonspecific killing action of the natural killer cells?
A) IgM only B) IgE only C) IgG only D) both IgG and IgM E) both IgM and IgE
Which cardiovascular structures in the fetus shunt blood away from the fetal lungs?
A) foramen ovale and ductus arteriosus B) foramen magnum and ductus venosus C) foramen ovale and ductus venosus D) umbilical artery and umbilical vein E) umbilical artery and ductus venosus