Which of the following anterior pituitary hormones stimulates the release of hormones by the adrenal glands?
a. Luteinizing hormone (LH)
b. Adrenocorticotropic hormone (ACTH)
c. Thyroid-stimulating hormone (TSH)
d. Follicle-stimulating hormone (FSH)
b
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In a(n) hydrostatic skeleton, the force of muscle contraction is applied against a rigid, external body covering
Indicate whether the statement is true or false.
What glyptodont cross ensures that you will have all yellow offspring?
a. aa x aa b. Aa x aa c. AA x aa d. Aa x aa
Cell surface markers involved in immune reactions
A. participate in communication with other cells of the system. B. are the result of genetic expression. C. function in recognition of self molecules. D. aid in cellular development. E. All of these choices are correct.
Fred Griffith studied two strains of Streptococcus pneumonia, one that causes a lethal infection when injected into mice, and a second that is harmless
He observed that pathogenic bacteria that have been killed by heating can no longer cause an infection. But when these heat-killed bacteria are mixed with live, harmless bacteria, this mixture is capable of infecting and killing a mouse. What did Griffith conclude from this experiment? (a) The infectious strain cannot killedby heating. (b) The heat-killed pathogenic bacteria "transformed" the harmless strain into a lethal one. (c) The harmless strain somehow revived the heat-killed pathogenic bacteria. (d) The mice had lost their immunity to infection with S. pneumoniae.