In humans, the embryonic and fetal forms of hemoglobin have a higher affinity for oxygen than that of adults. This is due to _____
A) nonidentical genes that produce different versions of globins during development.
B) pseudogenes, which interfere with gene expression in adults.
C) the attachment of methyl groups to cytosine following birth, which changes the type of hemoglobin produced.
D) histone proteins changing shape during embryonic development.
A
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Which of the following does not inhibit protein synthesis?
A. Tetracycline B. Erythromycin C. Streptomycin D. Penicillin E. All of the choices inhibit protein synthesis.
When compared to the leg muscles of an Olympic sprinter, the muscles of an Olympic marathoner would likely show a greater proportion of slow-twitch fibers
A. true B. false
Which of the following cells can serve as antigen-presenting cells?
a. macrophages, basophils, and B cells b. dendritic cells, B cells, and T cells c. macrophages, dendritic cells, and B cells d. B cells, T cells, and basophils e. macrophages, T cells, and basophils
Evolution allows us to explain:
A) only the diversity of life. B) both the diversity of life and how all living things are related. C) only the unity of life. D) only the origin of life.