A scientist is examining the function of macromolecules in a cell. She notices that movement of large molecules into and out of the cell is disrupted when she damages one specific type of macromolecule. Which macromolecule has she most likely damaged?
a carbohydrate
a steroid
a nucleic acid
a protein

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Which locations on the map are low-pressure areas? a b c d e

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons