A hypothesis currently getting a lot of attention concerning the origin of biological molecules is that they originated ____.
A. in hot springs
B. under ice sheets in Antarctica
C. near hydrothermal oceanic vents
D. in salt lakes
E. in tidal pools
Answer: C
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In eucaryotic cells, what are the sites of photosynthesis?
A) mitochondria B) plasmids C) plastids D) ribosomes
Facilitated diffusion is limited by
A. the substrate concentration. B. the size of the cell. C. carrier proteins in the membrane. D. osmotic pressure. E. the size of the pores in the membrane.
The host provides environment. Microorganisms feed on undigested food. Host feeds on digested food by microorganism. This relationship is known as:
A. mutualism B. Disease C. Colonization D. Commensalism E. Parasitism
A friend asks you a question after your biology class. "What's genetic engineering?" What is your answer?
A. "Genetic engineering is moving genes from one organism to another." B. "Genetic engineering is removing structural components, for example a lysosome, from one part of a cell and placing those structures elsewhere in that cell." C. "Genetic engineering is the ability of scientists to remove a nucleus from a cell and place it into another cell." D. "Genetic engineering is taking proteins from one organism and placing them into another organism of a different species."