The MONOPTEROUS gene in Arabidopsis encodes a protein that is similar in its function to which animal protein?
A) MyoD in frog embryos
B) Bicoid in fruit-fly embryos
C) keratin in human embryos
Answer: B
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Which of the following correctly describes the path of a drop of blood leaving the human heart?
A. heart arteries arterioles capillaries venules veins heart B. heart veins venules capillaries arterioles arteries heart C. heart arterioles arteries capillaries veins venules heart D. heart venules veins capillaries arteries arterioles heart E. heart arteries veins capillaries arterioles venules heart
If necessary, our muscles can rely upon an anaerobic (fermentative) pathway to metabolize glucose, but this can only last a short period of time. Why can't our cells survive very long under such anaerobic conditions?
A) Fermentation doesn't extract enough ATP from glucose to sustain our energy-craving cells. B) Anaerobic conditions create a "carbon dioxide debt" that must be repaid before cells die. C) The ethyl alcohol that builds up in muscles as a result of fermentation is a toxin. D) Lactic acid causes the cell to die when it's exposed to even lower concentrations.
Frameshift mutation nearly always results in a nonfunctional protein because every amino acid after the mutation is different from what was coded for in the original DNA.
a. true b. false
Ciliate sexual reproduction by conjugation differs from sexual reproduction in most animals in that ________.
A. cell fusion occurs during fertilization B. the zygotic nucleus is diploid C. meiosis occurs in both partners D. both parents are converted into zygotes