Pathogenicity islands are discrete genetic elements that encode virulence factors, such as toxins, adhesins, secretion systems, and iron transport proteins. These islands can be horizontally transferred between bacteria, resulting in enhanced virulence and fitness in the recipient.
a. true
b. false
Ans: a. true
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Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote
cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered a cofactor of Kinase 1? A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A
Nerve impulses coming into the spinal cord
enter via a. intervertebral disks. b. neuroglia. c. the dorsal roots. d. Broca's area. e. ventral roots
Why is the biodiversity of a tropical rain forest very high?
Which of the following is an appropriate feeding philosophy for children?
Select one: a. Parents should be responsible for choosing how much and when the child should eat. b. Parents should present a variety of nutritious food choices and avoid making the dinner table into a battleground. c. Children should be forced to eat what is good for them. d. Parents should present nutritious food choices and not worry about their own eating habits.