Which of the following statements about species, as defined by the biological species concept, is (are) correct? I. Biological species are defined by a group of organisms that can successfully interbreed with each other.II. Biological species are the model used for grouping extinct forms of life.III. The biological species is the largest unit of population in which homologous structures can be identified.
a. II only
b. I only
c. II and III
d. I, II, and III
e. III only
Answer: b. I only
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Place the following cell types in the correct order during the differentiation of a hematopoetic stem cell (HSC) into a macrophage. Some may be used once or not at all.
I. megakaryocyte II. lymphoid progenitor III. macrophage IV. hematopoetic progenitor V. myeloid progenitor VI. monocyte VII. hematopoetic stem cell A. VII, IV, V, VI, III B. IV, VII, V, VI, III C. IV, VII, II, VI, III D. VII, IV, V, II, III E. VII, IV, II, IV, III
HIV uses which of the following processes to synthesize a DNA strand using its RNA genome as a template?
a) conjugation b) reverse translation c) reverse transcription d) transcription e) translation
Based on the number of species, the most successful extant phylum of plants is the
A. Coniferophyta. B. Hepaticophyta. C. Charophyta. D. Pterophyta. E. Gnetophyta. F. Anthophyta.
Subacute bacterial endocarditis is commonly the result of infections initially focused on the oral cavity.
Indicate whether the statement is true or false.