Ricin is toxic because
a. it binds to eukaryotic DNA.
b. it binds to eukaryotic mRNA.
c. it blocks food from entering the cell.
d. it inactivates ribosomes.
e. it binds to nerve tissue and causes paralysis.
Answer: d
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The thin horizontal arrows in the figure above show that the _____
A) warmer arterial blood can bypass the legs as needed, when the legs are too cold to function well B) warmer venous blood transfers heat to the cooler arterial blood C) warmer arterial blood transfers heat to the cooler venous blood D) arterial blood is always cooler in the abdomen, compared to the temperature of the venous blood in the feet of the goose E) goose's legs get progressively warmer as the blood moves away from the abdomen towards the feet
Which of the following glandular secretions involved in digestion would be most likely to be released initially as zymogens?
A. protein-digesting enzymes B. fat-solubilizing bile salts C. acid-neutralizing bicarbonate D. carbohydrate-digesting enzymes
Which aspect(s) of chromosome behavior is/are primarily responsible for the tremendous amount of genetic variability associated with sexual reproduction?
A) segregation of sister chromatids at anaphase II of meiosis B) segregation of homologous chromosomes at anaphase I of meiosis C) crossing-over between homologous chromosomes during prophase I of meiosis D) independent alignment of different homologous pairs on the metaphase I spindle E) both crossing-over between homologous chromosomes during prophase I of meiosis and independent alignment of different homologous pairs on the metaphase I spindle
Which term can be applied to all of the vertebrates except for the jawless fish?
A. Endothermic B. Amniotes C. Tetrapods D. Gnathostomes