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TLS Online TPP Program

#Question id: 12095

It is now thought that the atmosphere of the primitive Earth was composed largely of carbon dioxide, nitrogen, and water vapor. The composition of certain iron-containing minerals suggests that the carbon dioxide began to be replaced by oxygen about 2 billion years ago.   Which of the following is the best explanation for the change in atmospheric composition?

#Unit 10. Ecological Principles
  1. Ozone produced in the upper atmosphere by ultraviolet light broke down to oxygen. 
  2. Minerals such as iron oxide released oxygen into the atmosphere.
  3. Oxygen was present in volcanic gases and slowly accumulated with time. 
  4. Photosynthesis was established in primitive bacteria.
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TLS Online TPP Program

#Question id: 20285

#Unit 7. System Physiology – Animal

Which of the following is CORRECT?
TLS Online TPP Program

#Question id: 20284

#Unit 7. System Physiology – Animal

What is the importance of C-peptide in proinsulin?
TLS Online TPP Program

#Question id: 20283

#Unit 7. System Physiology – Animal

The following statements regarding to the pancreas and its function.
a. The pancreas is composed of two major types of tissues, (1) the acini, which secrete digestive juices into the duodenum, and (2) the islets of Langerhans, which secrete insulin and glucagon directly into the blood.
b. The islets contain three major types of cells, alpha, beta, and delta cells
c. The beta cells, constituting about 25 percent of all the cells of the islets, lie mainly in the middle of each islet and secrete insulin and amylin.
d. The alpha cells, about 60 percent of the total, secrete glucagon and the delta cells, about 10 percent of the total, secrete somatostatin.
TLS Online TPP Program

#Question id: 20282

#Unit 7. System Physiology – Animal

Growth hormone secretion is regulated by negative feedback, three feedback loops including both long and short loops are involved,
a.  GHRH inhibits its own secretion from the hypothalamus via an ultrashort-loop feedback.
b. Somatomedins, which are by-products of the growth hormone action on target tissues, inhibit secretion of growth hormone by the anterior pituitary.
c. Both growth hormone and somatomedins stimulate the secretion of somatostatin by the hypothalamus.
d. SRIF is also secreted by the hypothalmus and acts on the somatotrophs to stimulate growth hormone secretion.
Which one of the following represents all correct statements?
TLS Online TPP Program

#Question id: 20281

#Unit 7. System Physiology – Animal

The overproduction of growth hormone in adults leads to
TLS Online TPP Program

#Question id: 20280

#Unit 7. System Physiology – Animal

What stimulates growth hormone release?