Nonencapsulated bacterial cells appear ______ in a properly prepared capsular stain.
A) Purple
B) Gray
C) Clear
A) Purple
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Why can sickle cell disease cause death?
a. The malformed red blood cells cannot transport oxygen. b. The malformed red blood cells cannot enter capillaries and, in fact, block them. c. The malformed blood cells assume a sickle-shape. d. The patient has two copies of the mutant gene. e. More cells assume the sickle shape as oxygen concentration in the tissues falls.
Which organ system is NOT required for the maintenance of homeostasis within an organism?
a. excretory system b. reproductive system c. skeletal system d. endocrine system e. lymphatic system
__________ is rapid diversification into new species that occupy novel niches. Fill in the blank(s) with the appropriate word(s)
Organisms that are radially symmetrical have ________ embryonic germ layers
A) two B) three C) four D) five E) six