You apply the acid-fast stain method to a patient's specimen, an aspirate from the lungs. Microscopic examination reveals a large number of bright pink-red bacillus-shaped bacteria in the smear. Which statement is true?
A. This is the expected outcome for normal sputum.
B. The patient has tuberculosis.
C. The patient has pneumonia.
D. The patient has an HIV infection.
Answer: B
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Plants and algae contain this organelle not found in heterotrophs:
a. nucleus. b. mitochondria. c. chloroplasts. d. flagella.
The ___ model of human origins is supported
by genetic studies.
a. replacement b. multiregional c. transitional d. relational e. allopatric
Based on the accompanying graph, which statement is accurate?
a. The primary response to the initial injection subsides after seven weeks.
b. The primary response to the initial injection peaks at 102 antibody units.
c. The primary response to the initial injection is faster, but not as intense as the secondary response.
d. The secondary response to the initial antigen is both faster and more intense than the primary response.
e. The primary and secondary responses to the initial antigen are about equal
The sex ratio
A. is typically 1:1 in species where both parents support the raising of young. B. is often dominated by males. C. is never greater than 1 female to 1 male. D. All of these conditions are true.