Which statement correctly describes how the first life on earth could have occurred by spontaneous generation?
In an environment with a high concentration of methane, a carbon-based
molecule, carbon chains of increasing length could have formed. Because life is
carbon-based, life could have resulted from this process.
In an environment without free oxygen, amino acids, nucleic acids, and lipids
were able to increase in number. In large amounts, these molecules could have
formed simple life forms.
The energy from lightning striking the ocean caused free elements to fuse
together in a permanent bond. Eventually, the combination of these molecules
over time formed primitive life.
In an environment that contained ammonia, the nitrogen became part of amino
acid, nucleic acid, and lipid molecules. These are the components of life forms.

Match the descriptions / definitions with the term they best describe 1. three dimensional relationship of the different polypeptide chains in a multisubunit protein or protein complex 2. common folding pattern in proteins in which a linear sequence of amino acids folds into a right-handed coil stabilized by internal hydrogen-bonding between polypeptide backbone atoms. 3. the amino acid sequence of a protein 4. a region on the surface of a protein that can interact with another molecule through noncovalent bonding. 5. three-dimensional arrangement of alpha-helices and beta-sheets within a single polypeptide, typically stabilized by a variety of noncovalent bonds, including ionic and hydrogen bonds, and nonpolar interactions / hydrophobic force. 6. the chain of repeating carbon and nitrogen atoms, linked by peptide bonds, in a protein. 7. common structural motif in proteins in which different sections of the polypeptide chain run alongside each other and are joined together by hydrogen bonding between atoms of the polypeptide backbone. 8. portion of a polypeptide chain that has a discrete tertiary structure of its own and can often fold independently of the rest of the chain 9. regular local folding patterns in a protein, including alpha-helix and beta-sheet a. primary structure b. beta-sheet c. protein d. coiled-coil e. polypeptide backbone f. secondary structure g. side chain h. tertiary structure i. binding site j. alpha-helix k. quaternary structure l. protein domain

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism