Vector-borne transmission can be either external or internal. In external (mechanical) transmission, the pathogen is carried
A. on a fomite.
B. within the vector.
C. on the body surface of a vector.
D. All of the choices are correct.
Answer: C
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Answer the following statements true (T) or false (F)
1. The processes of transcription and translation occur almost simultaneously in prokaryotic organisms. 2. Gel electrophoresis allows biologists to study the exact base pair sequence of a genetic fragment. 3. Gene therapy in humans is a common procedure to treat and prevent genetic diseases. 4. Animals such as mice and fruit flies have enough similarities to humans to be used as model organisms, leading to key life-saving medical discoveries. 5. Darwin’s theory of evolution was heavily influenced by the genetic studies by Mendel, which had been published right before Darwin set sail for the Galapagos on the HMS Beagle.
Explain how a benign growth in the colon can become a malignant tumor. What will be an ideal response?
Darwin’s primary contribution to biological theory was
a. the methods for estimating the age of fossils b. the concept that organisms change over time and form new species c. the mechanism by which mutations come about d. the concept of gene pools and changes in allele frequencies e. the mechanism by which populations of organisms change over time
The envelope of enveloped viruses
A. does not contain spikes. B. is identical to the host plasma membrane. C. is only composed of host endomembrane. D. makes the virus very susceptible to drug therapy. E. is obtained by viral budding or exocytosis.