All of the following statements about the endocrine system are TRUE EXCEPT which one?
A) Many hormones are not able to cross the blood-brain barrier.
B) Hormones are distributed via the circulatory system.
C) Hormones exert their effects on cells that have the specific hormone receptor.
D) Hormones act more quickly than the nervous system.
E) The endocrine system and the nervous system frequently interact.
D
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To see if a growth-promoting factor was released from blood platelets, cells called fibroblasts were placed in a dish containing liquid cell culture medium
The medium was supplemented with either serum (collected from blood that had been allowed to clot) or plasma from blood in which the platelets had not been activated during the clotting process. The number of cells in each culture is shown in the graph. Reference: Ref 9-2 How many cells are there on Day 3 in the culture that contains serum? A. 80,000 B. 800,000 C. 40,000 D. 400,000
Which of the following enzymes unwinds the DNA helix during replication in E. coli?
A. primase B. DNA Pol I C. gyrase D. helicase E. SSB
Viruses constitute the fourth domain of life in current biological classification schemes.
Answer the following statement true (T) or false (F)
Although the cells of a multicellular organism are specialized for certain functions, those cells must also be integrated and organized in order to work together to benefit the organism
Indicate whether the statement is true or false