Which of the following is NOT an example of a heterotroph?
a) mushroom.
b) leopard.
c) grass.
d) human.
Ans: a) mushroom.
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All of the following are respiratory structures associated with the exchange of gases EXCEPT
a. the tracheal system. b. lungs. c. gills. d. villi.
In humans, many types of cancers are associated with chromosomal mutations
Indicate whether the statement is true or false
What stage is it when replication occurs in a cell?
What will be an ideal response?
Which of the following statements is TRUE regarding tuberculosis?
A) It occurs only in the lungs. B) Several hundred cells are required for infection. C) It remains viable in dried aerosol droplets for up to eight months. D) Only virulent strains of Mycobacterium tuberculosis produce mycolic acid. E) The immune system is not affected by the infection.