What are spiracles?
A) Openings between the gills of a frog tadpole
B) Openings to the parabronchi
C) Openings into the tracheae of insects
D) Openings to the bronchi
E) Openings into the alveoli of the lungs
C
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Cytoplasmic division in oogenesis is unusual in that ________
a. the cytoplasm is not equally distributed to each daughter cell b. a cell called a polar body, which lacks any DNA, is produced c. the secondary oocyte is diploid d. mitochondria are selectively degraded by lysosomes before cell division is complete
Because embryonic stem cells can form any tissue in the human body, they are termed
_____________; adult stem cells, on the other hand, are termed ______________. Fill in the blank(s) with the appropriate word(s).
The atoms that make up the molecules in our bodies
A) will be lost back to space soon after we die. B) have nearly all been on Earth throughout its entire history. C) were once part of a dinosaur. D) were all formed recently by nuclear fusion on the sun. E) came from a wooly mammoth.
Around hydrothermal vents at depths of more than 2,500 m, scientists have found colonies of giant tube-dwelling worms. The worms contain symbiotic prokaryotes that are able to use hydrogen sulfide as an energy source for the synthesis of organic matter from carbon dioxide. The bacteria are _____.
Fill in the blank(s) with the appropriate word(s).