Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H2S will _____
A) have greater cohesion to other molecules of H2S
B) have a greater tendency to form hydrogen bonds with each other
C) have a higher capacity to absorb heat for the same change in temperature
D) not form hydrogen bonds with each other
D
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A controlled experiment is one that _____
A) proceeds slowly enough that a scientist can make careful records of the results B) tests experimental and control groups in parallel C) is repeated many times to make sure the results are accurate D) controls all variables E) is supervised by an experienced scientist
Contrary to popular belief, stress is not usually the primary cause of ulcers, and many patients with ulcers do not over-produce acid. What Nobel prize-winning discovery demonstrated a previously unknown cause of ulcers?
A. greater acid concentrations in the stomach, lower esophagus, and duodenum B. the eroding effect of certain spicy foods on the lining of the esophagus C. the existence of a bacterial infection in the stomachs of most patients with ulcers D. genetically predetermined weakness in the walls of the intestinal tract
A population ecologist is studying the demographics of American bison living on a grassland in North Dakota. She
captures, marks, and releases 100 bison. Later, she recaptures 100 bison and discovers that 50 were previously marked and half of those marked are of reproductive age. What is the population ecologist’s estimate of how many bison in the total population are of reproductive age?
a. 200 b. 50 c. 100 d. 20 e. 10
Which is a result of severely restricting calories to lose weight?
A) a successful weight management outcome B) a loss of body fat only C) the body increasing its metabolic rate to burn more fat D) the body slowing its metabolism to conserve energy