Data from the Human Genome Project revealed that humans, considered among the most complex of all organisms,
have fewer genes and less DNA than some "simpler" organisms. Explain how a species can be more complex than
another even though it possesses fewer genes. What will be an ideal response?
ANSWER: Not all the genes in the human genome have been identified, but the 20,000 genes is far
fewer than the predicted number of 80,000 to 100,000. In addition, there are many more
different proteins in the human body than there are genes. This discrepancy is explained by
the fact that the mRNAs from over 90% of our genes are processed in several ways so that a
genome with 20,000 to 25,000 genes can produce several hundred thousand different
proteins.
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The ability of some organisms to alter their membrane lipid composition in response to temperature is known as ________.
Fill in the blank(s) with the appropriate word(s).
The Five I's of studying microorganisms include all of the following except ________.
A. isolation B. incubation C. inoculation D. identification E. infection
A tissue consists of interacting cells and
a. blood cells. b. pigmented skin cells. c. extracellular substances. d. nerve cells. e. none of these.
A newly discovered unicellular microbe has a nucleus containing linear chromosomes and surrounded by a membrane. It has mitochondria, 80s ribosomes, and is covered by cilia. There is no cell wall external to the plasma membrane. This organism most likely would be a/an ________.
A. protozoan B. fungus C. algae D. bacterium E. archaeon