Viruses completely lack the genes for synthesis of
A) metabolic enzymes.
B) proteins in the capsid.
C) lipids in the envelope.
D) nucleic acids in the core.
Ans: A) metabolic enzymes.
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Animals with a body cavity located between the mesoderm and endoderm are _____.
Fill in the blank(s) with the appropriate word(s).
Salmonella enteritidis causes a food-borne illness that kills 400 to 600 Americans each year. It is found mainly in poultry products
Rather than give large doses of antibiotics to poultry, some poultry producers infect the intestinal tract of hens with a harmless bacteria, resulting in a dramatic decrease of S. enteritidis found in the chickens. In this case, what principle did the producers use? A) mutualism B) predation C) competitive exclusion D) parasitism
All the following are found in both plant and animal cells, except
a. cell wall b. cell membrane c. mitochondria
Gamete formation results in __________________________.
A. offspring that are genetic clones of the parent B. the pairing of homologous chromosomes C. offspring that are genetically distinct from each other D. the fusion of gametes. E. asexual reproduction