How does the location of DNA in animal cells compare to DNA's location in plant cells?
What will be an ideal response?
Animal cells have DNA in their nuclei and mitochondria, while plant cells have it in their nuclei, mitochondria, and chloroplasts.
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Taste buds are
a. really just modified sensilla. b. found only on the tongue. c. collections of papilla that each respond to different stimuli. d. small capsules of cells, each with a pore at the top though which sensory hairs project and interact with environmental molecules. e. EACH able to respond to sweet, sour, salty, bitter, and savory (umami) stimuli.
Gangrene is often caused by anaerobic bacteria deep in tissues that lack adequate blood flow and adequate oxygen supply. Many times, gangrene can be treated by putting the patient into a hyperbaric chamber. Which statement best describes why this type of therapy is effective?
A) The increased pressure drives nitrogen into the system and nitrogen gas poisons the bacteria. B) The increased pressure drives more oxygen into the bloodstream and, therefore, anaerobic bacteria cannot survive in the presence of oxygen. C) The increased pressure creates a higher pressure in the capillaries of the tissue and drives the toxin produced by the bacteria into the bloodstream, where it is diluted. D) The increased pressure destroys the cell wall of the bacteria. E) When the patient is brought back to normal atmospheric pressure, carbon dioxide comes out of solution at high concentrations, which poisons the bacteria.
A series of enzyme-mediated reactions by which cells build, remodel, or break down organic molecules is known as ____.
a. energy carriers
b. metabolic pathways
c. the induced-fit model
d. intermediary compounds
e. activation
?
What is the item labeled "C" in the accompanying figure?
A. The reactant B. The substrate C. The active site D. The transition state E. The product