Which was the primary challenge animals faced in adapting to life on land?
a. The presence of new predators
b. Being able to adapt to move on land
c. The need for more oxygen to do work
d. Finding a mate in the new environment
e. The desiccating effect of the atmosphere
e
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Compound D is a ____________________.
Assume that you are taking an organic chemistry class. Your teacher has given you four organic compounds to analyze. She tells you that one is a carbohydrate, one is a hydrocarbon, one is a nucleic acid, and one is a protein. You discover that Compound D contains only carbon, hydrogen, oxygen, nitrogen, and phosphorous. Of the four types of compounds which were given to you to analyze, which one best describes Compound D?
Which of the following play some role in sewage treatment?
A. activated sludge B. trickling filter C. septic tank D. lagooning E. All of the choices are correct.
Nearsightedness is dominant to normal vision and hazel eyes are dominant to blue eyes. A nearsighted woman with hazel eyes who is heterozygous for both traits marries a man with normal vision and hazel eyes. His genotype for eye color is the same as his wife's. Their three children all have blue eyes and normal vision. What is the probability that their next child will have blue eyes and be nearsighted?
A. 1/2 B. 3/8 C. 1/4 D. 5/8 E. 1/8
An elderly patient with no recent hospitalizations presents with shortness of breath, chest pain, a deep productive cough, and evidence of consolidation. Acid-fast and Gram stains are performed on a sputum sample. No acid-fast bacteria are detected but
Gram-negative, non-encapsulated bacteria are observed. A likely diagnosis is A) Legionnaire's disease. B) Streptococcus pneumoniae. C) influenza. D) nontypable Hemophilus influenzae B. E) Mycobacterium avium.