Transformation was discovered by:
a. Francois Jacob.
b. Elie L. Wollman.
c. Gregor Mendel.
d. Joshua Lederberg.
e. Fred Griffith.
E
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Which of these statements INCORRECTLY describes an example of pleiotropy?
A. A mutation in a Cl-transport protein causes infertility and excessive mucus in the lungs. B. A mutation in a gene for microtubule formation causes a defect in sperm motility and cilia movement in the respiratory tract. C. A mutation in a lipid metabolism gene leads to a buildup of lipids in cells, causing blindness and paralysis. D. A mutation in the phenylalanine hydroxylase gene can cause mental retardation and loss of motor skills. E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.
Fragile X syndrome is caused by ____ on the X chromosome in humans
a. the presence of CCG repeats b. mutations within CCG repeats c. deletion of CCG repeats d. overreplication of CCG repeats e. the absence of CCG repeats
Circular DNA that is apart from the chromosome DNA in some prokaryotes is called a(n)
A. endospore. B. nucleoid. C. ribosome. D. plasmid. E. nucleus.
Keratin filaments are found in what cell types?
a. Fibroblasts b. Epithelial cells c. Muscle cells d. Neurons e. All of the above