Q26 An example of a receptor in a negative feedback loop controlling body temperature would be regulatory centers that send commands to an effector temperature sensors on the skin that detect a stimulus. sweat glands that increase secretion. effectors that cause blood vessels to dilate sweat glands that act like effectors. QUESTION 14 Q48 An activated protein can trigger the opening of calcium ion channels in the membrane the activation of adenyl cyclase. the release of calcium ions from intracellular stores a fall in CAMP levels All of the answers are correct. QUESTION 15 049 The link between a first messenger and a second messenger in a cell that responds to peptide hormones is usually protein CMP adenyl cyclase calcium ion levels CAMP
Q26 An example of a receptor in a negative feedback loop controlling body temperature would be regulatory centers that send commands to an effector temperature sensors on the skin that detect a stimulus. sweat glands that increase secretion. effectors that cause blood vessels to dilate sweat glands that act like effectors. QUESTION 14 Q48 An activated protein can trigger the opening of calcium ion channels in the membrane the activation of adenyl cyclase. the release of calcium ions from intracellular stores a fall in CAMP levels All of the answers are correct. QUESTION 15 049 The link between a first messenger and a second messenger in a cell that responds to peptide hormones is usually protein CMP adenyl cyclase calcium ion levels CAMP
Answer
13.
ANSWER : OPTION 2.
The temperature receptors located in the skin detects the
changes in the temperature and they send signals to the temperature
regulator center which is located in the hypothalamus which further
gives a to regulate the temperature.
14.
ANSWER : OPTION B
When G protein is activated,aplha subunit detaches by binding
with GTP.Now, both aplha GTP unit and beta-gamma dimer,activate
second messenger pathways.ie. they activte adenyl cyclase which is
an enzyme present in the cell membrane.
Activated G protien does not open calcium channels.so option A,C
are wrong.
Activated adenyl cyclase further convert cytoplasmic ATP into
cyclicAMP OR cAMP.Hence,activation of G protein increases the level
of cAMP.So, option D is wrong.
15.
ANSWER : OPTION A
G protien act as a link between the first messenger (the
hormone) and the second messenger(cAMP).Hormone comes and binds to
the G protein complex which is located in the cell membrane,and it
produces cAMP by activating adenyl cyclase.
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