Prions are created when normal proteins in the body ____
a. combine with large ribosomal subunit and become infectious
b. exchange several long sections of amino acids with other infected proteins
c. refold into a different and infectious three-dimensional shape that kills cells in the brain and nervous system
d. undergo mutation and create hundreds of copies of themselves
e. invade the immune system, causing it to mistakenly destroy the body's healthy tissue
c
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Today, the enrichment culture technique developed over a century ago by Martinus Beijerinck remains a feasible approach to discovering bacteria capable of degrading pollutants
Indicate whether the statement is true or false.
Which of the following is true about the relationship between plectonemic and solenoidal supercoils?
A. Plectonemic supercoils are stabilized by proteins, whereas solenoidal supercoils are not. B. The formation of plectonemic versus solenoidal supercoils is sequence specific. C. Plectonemic supercoils are always left-handed and solenoidal supercoils are always right-handed. D. In underwound DNA, plectonemic supercoils are all right-handed and solenoidal supercoils are all left-handed. E. Plectonemic supercoils compact the DNA to a greater extent than solenoidal supercoils.
Which one of the following is the major energy storage compound of plant seeds?
A. amylose B. glycogen C. cellulose D. lipids E. oils
Innate immunity is a defense system that becomes fully functional after it has undergone a period of exposure to various pathogens.
Answer the following statement true (T) or false (F)