The organism recorded in this 2.1-billion-year-old fossil is almost certainly a eukaryote; no prokaryote has been observed to be multicellular with such relatively large cells.
Definitions:
Signaling Molecules
Chemicals that transmit information between cells in the body, facilitating various physiological processes such as growth, inflammation, and neural communication.
Callus
Undifferentiated tissue formed on an explant (excised tissue or organ) in plant tissue culture.
Trichomes
Small hair-like outgrowths on plants that serve various functions including protection against herbivores and minimizing water loss.
Parenchyma
A type of plant tissue composed of living cells that are often spacious and used for functions such as photosynthesis, storage, and tissue repair.
Q3: _ regulates the maturation of the mammary
Q16: In photosynthesis, the carbon used to make
Q28: Elevated HDL (high-density lipoprotein)levels seem to provide
Q32: Which of the following statements is true?<br>A)All
Q46: Gap junctions allow large molecules to move
Q51: Channel proteins require energy for transporting molecules
Q57: An organ is defined as a body
Q58: Prokaryotes obtain their nutrition in a variety
Q59: The most ancient eukaryotic fossils are similar
Q59: The science of biological classification is used