The time it takes for half of a quantity of a radioisotope to decay into a more stable isotope is
a. the same for all elements.
b. decay time.
c. half-life.
d. disintegration time.
e. dependent on temperature.
C
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Answer the following statements true (T) or false (F)
1. Mammalian eggs like those of humans undergo holoblastic cleavage and compaction during development. 2. The neural tube or spinal chord is derived from mesoderm. 3. The endoderm is a germ cell layer that tends to cover the embryo. 4. Fate mapping is a valuable tool to establish the type of cells derived from certain undifferentiated cells within an early embryo.
What is the key concept addressed by the question?
What will be an ideal response?
Testosterone is made in the testes, where it stimulates sperm development. Additionally, testosterone is carried in the blood throughout the body, stimulating the growth of facial hair and muscles. Therefore, testosterone is
A) an endocrine hormone. B) both a local and an endocrine hormone. C) a local hormone. D) both a neurotransmitter and an endocrine hormone. E) a neurotransmitter.
When a person's blood pH is too low, the kidneys will restore a healthier balance by ________
A) reabsorbing more hydrogen ions from the filtrate B) slowing ventilation C) secreting excess hydrogen ions into urine D) secreting more sodium ions into the urine