The embryonic layer found only in bilaterally symmetrical eumetazoans is the ________.
Fill in the blank(s) with the appropriate word(s).
mesoderm
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How does radiometric dating work?
1.Cooling of molten rock produces particular mineral structures that can be used to determine when a crystal formed. 2.Radioisotope decay speeds up over time, so a graph can be made to predict the date. 3.Although ratios of atoms cannot be determined precisely, their half-lives can be used to predict an approximate date that a crystal formed. 4.Fossils older than 60,000 years can only be dated using carbon 14 since all other atoms will have decayed since then.
Which condition shows 100 percent penetrance?
a. sickle cell disease b. cystic fibrosis c. polydactyly d. camptodactyly e. eye color
Which of the following best describes cyanobacteria?
A. They all can use H2S as a source of electrons for photosynthesis. B. They carry out oxygenic photosynthesis. C. They carry out anoxygenic photosynthesis. D. Their photosynthetic pigments are carried in chlorosomes.
The nitrogenous base found in RNA but not DNA is ________
Fill in the blank(s) with correct word