When a tumor cell breaks off from the initial tumor it invades the ___ before entering the circulatory system.
a. Cytoplasm
b. Signal transduction pathway
c. ECM
d. All of the above
Ans: c. ECM
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A woman goes to the doctor and is diagnosed as having rheumatoid arthritis. What factors led to her development of this disease? Select all correct choices
A. Some of her T cells were not positively selected. B. Some of her T cells were not negatively selected. C. Some of her T cells are recognizing and responding to her normal self antigens. D. Some of her T cells are not recognizing and associating with her MHC proteins.
How is a DNA fragment containing a gene of interest generated for cloning?
a. The gene with a cloning vector is ligated. b. Agarose gel electrophoresis takes place c. The polymerase chain reaction (PCR) amplifies the DNA fragment from the genome d. A DNA polymerase specific for the fragment is used to make copies e. DNA fingerprinting allows the fragment to be copied from the chromosome.
Triglycerides are ____
a. carbohydrates b. nucleotides c. proteins d. neutral fats e. amino acids
Maurice Wilkins and Rosalind Franklin obtained X-ray diffraction photographs that indicted that DNA has a ____________________ shape with a constant diameter Fill in the blank(s) with the appropriate word(s)