Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells.
B. Radioactive substances have the potential to cause damage to living cells.
C. Radioactive substances decay.
D. Radioactive substances will perforate plasma membranes.
B
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How has the avian lung adapted to the metabolic demands of flight?
A) Airflow through the avian lung is bidirectional like in mammals. B) There is more dead space within the avian lung so that oxygen can be stored for future use. C) Countercurrent circulation is present in the avian lung. D) Gas exchange occurs during both inhalation and exhalation.
Discuss the benefits of mate choice.
What will be an ideal response?
You have discovered a new invertebrate species that is slow-moving and widely dispersed. What might you predict about its reproductive system?
A. It is likely to be hermaphroditic. B. It is likely to use internal fertilization and brood care. C. Males are likely to be smaller than females. D. Females are likely to be smaller than males.
Receptors for peptide hormones lie
A. in the cytoplasm. B. in the nucleus of the cell. C. within the cell membrane. D. in association with ribosomes in the cytoplasm.