Which disease is caused by an exotoxin released by the gram-positive, endospore-forming bacteria, often because food
was not heated sufficiently to kill the endospores?
a. cholera
b. botulism
c. diphtheria
d. salmonella
e. travelers’ diarrhea
b
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Answer the following statements true (T) or false (F)
1. A gene is any DNA sequence that is transcribed to any type of RNA. 2. In eukaryotic cells, a poly-A tail helps attach the ribosome to the mRNA molecule and may also determine how long the mRNA is retained within the cell. 3. Cystic fibrosis may be caused by a protein that does not fold correctly into its final form. 4. Because cells are very efficient in the processes that they carry out, very little energy is needed for the cell to make proteins. 5. In eukaryotic cells, an mRNA molecule can only be translated by one ribosome at a time.
The activation energy for a reaction
a. is less when enzymes are present. b. allows greater interaction of substrate with the active site. c. is needed to begin a reaction. d. puts the substrate at its transition state. e. is all of these.
Hyperthermophilic Archaea have been found to contain dibiphytanyl tetraether lipids. Why are these lipids different from lipids present in non-hyperthermophiles? What special properties and structures do they confer?
What will be an ideal response?
Which of the following geographical areas
offers the most suitable environment for development of life?
a. tropical regions b. temperate regions c. desert regions d. equatorial regions e. polar regions