A tracheid is
A. a gametophyte cell.
B. a small branch of an insect trachea.
C. a seed-bearing stem.
D. a specialized vascular cell.
E. a reproductive chamber.
D. a specialized vascular cell.
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Helicobacter pylori is a bacterial organism that causes ulcers and digestive disturbances. How might they survive the acid pH of the stomach?
A) They secrete buffers to neutralize acid. B) They burrow under the mucus layer that covers the stomach epithelium. C) They take over the parietal cells. D) They release chemicals that decrease acid production in the stomach.
What is the path of fluid as it is filtered from the blood and flows through the nephron?
A. Bowman's capsule ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule ? collecting duct B. collecting duct ? Bowman's capsule ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule C. Bowman's capsule ? loop of Henle ? proximal convoluted tubule ? distal convoluted tubule ? collecting duct D. Bowman's capsule? distal convoluted tubule ? loop of Henle ? proximal convoluted tubule ? collecting duct E. collecting duct ? distal convoluted tubule ? loop of Henle ? proximal convoluted tubule ? Bowman's capsule
In a pedigree chart, a female showing the specific trait being studied is indicated by a ____
a. clear square b. darkened square c. clear circle d. darkened diamond e. darkened circle
Suicide genes can be controlled by the fimbriae-gene operator. This would result in the death of
A) All cells. B) Cells making flagella. C) Cells making fimbriae. D) Cells at 37°C. E) Conjugating cells.