A (an) __________ occurs when a disease spreads
fast through a part of a population, then subsides.
a. infectious disease
b. chronic disease
c. pandemic
d. epidemic
e. pathogen
Answer: d
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What makes phospholipids good at forming cellular membranes?
A. Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer. B. The polar and non-polar regions create an amphipathic bilayer of phospholipids. C. Covalent and ionic bonds between glycerols create a tight seal around the cell. D. The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape.
A tube foot of a sea star moves when the small muscular bulb called the ____ contracts, forcing fluid into the tube foot
a. ampulla b. ossicle c. radial canal d. ring canal e. madreporite
Why do scientists hypothesize that RNA was the first form of genetic material?
A. RNA can store genetic information and form membranes. B. RNA can store genetic information. C. RNA can catalyze reactions. D. RNA can catalyze reactions and store genetic information. E. RNA can catalyze reactions and form membranes.
Put the following terms in order from first to last in development.
A. zygote ? morula ? blastula ? gastrula B. morula ? blastula ? gastrula ? zygote C. blastula ? zygote ? gastrula ? morula D. zygote ? morula ? gastrula ? blastula