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

Biology & Microbiology

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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.

Biology & Microbiology

In land plants, what is the waterproof covering on the leaves and stems called?

a. stomata b. stroma c. cuticle d. pellicle

Biology & Microbiology

An egg's polarity determines the orientation of body axes

Indicate whether the statement is true or false.

Biology & Microbiology

Prokaryotes may use several different terminal oxidases for the electron transport system.

Answer the following statement true (T) or false (F)

Biology & Microbiology