Written by Merel Dagher (PEACE Advisor)  Press “Read More” to see the answers.  The correct answer is a. Noggin works like a negative inductive signal that inhibits BMP-4 from binding to its receptor. When the levels of Noggin are higher than those of BMP-4, more dorsal structures will be formed. When the levels of...

Written by Merel Dagher (PEACE Advisor)  Press “Read More” to see the answers.  The correct answer is b. The Central Dogma states that DNA is transcribed into mRNA which is then translated into proteins. It clearly shows the purpose of RNA (to make proteins) and DNA (to make RNA). It also explains what is...

Written by Merel Dagher (PEACE Advisor)  The correct answer is b. Food is taken in via the mouth, where amylase is secreted by the salivary glands. Amylase helps the breakdown of sugars. After that, the food travels down to the esophagus, where it eventually enters the stomach. The parietal cells in the stomach secrete...

Written by Merel Dagher (PEACE Advisor)  Click “Read More” to see the answers.  The correct answer is d. Recombination occurs in Meiosis I and allows for the exchange of some DNA between homologous chromosomes – when the meiotic division occurs, the cells, as a result, are different from their parents (potentially) and different from...

Written by Merel Dagher (PEACE Advisor)  Click “Read More” to see the answers.  The correct answer is c. Cholecystokinin is secreted by the duodendum wall and binds to receptors in the gallbladder and pancreas. It causes the secretion of bile from the gallbladder and x-ases from the pancreas. Secretin, on the other hand, is...

Written by Merel Dagher (PEACE Advisor)  Click “Read More” to see the answers.  The correct answer is e. Rapid stress response involves nerve impulses that directly target the spinal cord. From there, the spinal cord sends more nerve impulses to the medulla of the adrenal gland, triggering the production of epinephrine from tyrosine. This...

Written by Merel Dagher (PEACE Advisor)  Click “Read More” to see the answer.  The correct answer is e. Blood becomes oxygenated in the lungs through the gas exchange of carbon dioxide and oxygen. It then travels, via the pulmonary circuit, to the heart. The heart distributes this blood to the rest of the body...

Written by Merel Dagher (PEACE Advisor)  Press “Read More” to see the answers.  The correct answer is e. There is one of two pathways that can be taken, depending on the levels of glucose in the body. If glucose levels are high, the beta-islet cells of the pancreas will secrete insulin which will bind...

Written by Merel Dagher (PEACE Advisor)  Press “Read More” to see the answers.  The correct answer is a. hCG is a hormone secreted by the placenta in order to maintain the activity of the corpus luteum. The corpus luteum is needed for the secretion of estrogen and progesterone, which bind to receptors in the...

Written by Merel Dagher (PEACE Advisor)  Press “Read More” to see the answer.  The correct answer is e. There is one of two pathways that can be taken, depending on the levels of glucose in the body. If glucose levels are high, the beta-islet cells of the pancreas will secrete insulin which will bind...