Bacteria causes acne by
a. infecting the epidermis.
b. infecting the ducts of sweat glands.
c. infecting hair follicles.
d. infecting subcutaneous tissue.
e. infecting the ducts of oil glands.
E
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The movement of substances to regions of lower concentration is called
A. active transport. B. diffusion. C. pinocytosis. D. pumping. E. exocytosis.
Which of the following could possibly account for an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body. B. Hox genes duplicated once during animal evolution. C. Duplication of Hox genes and duplication of Hox gene clusters throughout animal evolution. D. Inversion of Hox genes about 600 million years ago. E. The creation of Hox gene clusters through inversion and uncontrolled replication.
Infective and non-infective viruses may be distinguished by growth on MacConkey's agar
Indicate whether this statement is true or false.
What are mycelia?
a. a network of microscopic interwoven filaments b. a strand of walled cells arranged end to end c. composite organisms consisting of a fungus and a single-celled photosynthetic species d. aquatic fungi that produce flagellated spores e. mutually beneficial relationships between fungi and plant roots