Viruses are classified based on which of the following?
a. nucleic acid content.
b. presence or absence of an envelope.
c. structure of capsid.
d. all of the above.
Ans: d. all of the above.
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________are the most genetically modified organisms used by scientists
a. Bacteria b. Chickens c. Goats d. Cows e. Mice
Gene therapy is:
a. replacing all mutant alleles in body cells. b. replacing poor copies of alleles with normal alleles. c. replacing a mutant allele in certain body cells with a normal allele. d. repairing mutant alleles in certain body cells. e. improving gene expression in key body cells.
Product recalls on frozen hamburger are not uncommon during any given year. The meatpacking industry can experience problems when processing centers accidentally introduce this fecal bacterium into ground meat
Which organism is commonly found to be the culprit? A) Clostridium B) E. coli C) Streptococcus D) Staphylococcus
Figure 53-6 represents the age structure diagram of:
a. the transition stage. b. the preindustrial state. c. a moderately developed country. d. a developing country. e. a highly developed country.