Which organ is the target for insulin-like growth factors?
a. heart
b. bone marrow
c. gonads
d. most body cells
e. kidney
ANSWER: d
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Which of the following is not a typical occurrence in the history of a transposon's appearance in an organism?
A. Transposons could be dispersed to a new host cell by conjugation, viral infection, or accidental uptake of DNA by the cell. B. After its introduction into the new host cell, the transposon is likely to experience a period of high transposition activity. This activity is unlikely to be detrimental to the host cell. C. After introduction into the new host cell, the transposon is likely to increase its copy number. D. Eventually, the transposon becomes subject to silencing processes including mutations in the transposase gene. E. The host may find a way to shut down transposition. One common method is RNA interference.
Match the following names with the correct phrases.
_______1. Developed vaccines for anthrax and rabies. _______2. Proposed the theory of biogenesis. _______3. Discovered the etiologic agent of plague. _______4. The first person to observe live bacteria and protozoa. _______5. Developed an experimental procedure that could be used to prove that a specific microorganism is the cause of a specific infectious disease. a. Anton van Leeuwenhoek b. Robert Koch c. Louis Pasteur d. Rudolf Virchow e. Alexandre Emil Jean Yersin
Describe the steps of inflammation and how inflammation supports immunity
What will be an ideal response?
What is the role of the enzyme ligase in DNA replication?
A. It matches new bases to the old strand by complementary base-pairing. B. It folds the DNA into a coiled structure. C. It unzips the double-stranded DNA. D. It seals any breaks in the sugar-phosphate backbone. E. It breaks the hydrogen bonds that hold the two strands of the DNA together.