During development, ___________________ brings ectodermal cells from the neural tube outward to their final positions throughout the body, such as the neurons of the peripheral nervous systems and melanocytes in skin.
Fill in the blank(s) with the appropriate word(s).
cell migration
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According to the serial endosymbiosis hypothesis, the ancestors of mitochondria are thought to be purple bacteria
____________________ Indicate whether the statement is true or false.
Trichinella spiralis is a/an ________ that invades the ________.
A. roundworm, intestine and muscle B. flatworm, heart C. flagellate, large intestine D. tapeworm, lungs E. ameba, intestine
The net reproductive rate is the sum of what column?
A) lxbx B) bx C) lx D) x
The earliest cells detectable in fossils were different from the cells in animals, plants, fungi, and protists living today. These first prokaryotic cells gave rise to eukaryotic cells approximately 1.7 billion years ago. The structure of eukaryotic cells today suggests how they might have evolved from their prokaryotic ancestors. Scientists examining mitochondria and chloroplasts now think that these organelles were probably free-living prokaryotes before becoming a part of eukaryotic cells long ago. Which of the following is a characteristic of chloroplasts that suggests that they might have evolved from free-living bacteria?
A) Chloroplasts have cell walls. B) Chloroplasts contain pigments. C) Chloroplasts have their own DNA. D) A single, highly folded plasma membrane surrounds chloroplasts.