Staphylococcus aureus is a type of bacterium that can cause infections in humans. These bacteria can exist for long periods of time in air, dust, water, and food, as well as on environmental surfaces. Rhinovirus is a type of virus that can cause the common cold in humans. Rhinovirus cannot survive outside of a human host for more than a few hours.
Which of the following best describes a major difference between bacteria and viruses?
A. Viruses can cause infections in the human body, whereas there are no types of bacteria that can cause infections.
B. Bacteria cannot survive without a living host, whereas viruses can often live and grow outside of the human body.
C. Bacteria can cause infections in the human body, whereas there are no types of viruses that can cause infections.
D. Viruses cannot survive without a living host, whereas bacteria can often live and grow outside of the human body.

PLS ALSO EXPLAIN WHY THE OTHER ANSWER CHOICES ARE INCORRECT!

Which of the following structures is not found in both plant and animal cells? a) chloroplast b) cytoskeleton c) ribosomes d) mitochondria

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

Did you know that a blue wales tongue weighs more than an elephant?