A microbiologist explains to one of her biology classes that her research focuses on the nucleoid region of the cholera bacteria. This means that she is studying a region within the bacterium that contains the
A. peptidoglycan.
B. nuclear membrane.
C. nucleic acids.
D. R plasmids.
Answer: C
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Secondary cell walls are stronger than primary cell walls because secondary cell walls contain
a. more pectin. b. less lignin. c. more chitin d. more lignin e. layers of cellulose fibrils at various orientations to one another.
The human kidney has an outer cortex, an inner medulla, and a renal pelvis that collects and stores urine before it leaves the kidney.
Answer the following statement true (T) or false (F)
You are doing field study work with a scientist studying spiders in the Amazon rainforest. You come across a previously undiscovered species of spider and set up a video camera with a zoom lens to observe it closely without disturbing it. You see the
female spider lay two eggs, kill an ant that tried to eat one of the eggs, and preserve the ant to feed the hatchlings the next day. She lays two more eggs as soon as the two offspring grow larger and leave. When your mentor asks for a monthly update, what exciting news do you have for her about this species? A) It exhibits unusual zero population growth tendencies. B) It exhibits unusual K-selected tendencies. C) It exhibits unusual intelligent learning tendencies. D) It exhibits unusual r-selected tendencies.
The three domains proposed by Carl Woese and George Fox are the Archaea, the Eukarya, and the Protista.
Answer the following statement true (T) or false (F)