The leukocytes that are involved in nonspecifically killing altered self-cells, such as tumor cells and
virus infected cells, are the __________.
a. monocytes
b. natural killer cells
c. neutrophils
d. B cells
e. eosinophils
B
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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.
In land plants, what is the waterproof covering on the leaves and stems called?
a. stomata b. stroma c. cuticle d. pellicle
An egg's polarity determines the orientation of body axes
Indicate whether the statement is true or false.
Prokaryotes may use several different terminal oxidases for the electron transport system.
Answer the following statement true (T) or false (F)