In an experiment you observed that norepinephrine binds to their specific plasma membrane receptor. The receptor to which norepinephrine binds and elicits its functional response is generally known as beta-adrenergic receptor. Propranolol is a drug that blocks beta-adrenergic receptors. Norepinephrine and beta-adrenergic receptor interaction finally led to a functional response, such as inhibition of neuronal sodium-potassium ATPase. This neuronal preparation was devoid of nucleus. In another experiment, thyroid hormone also caused inhibition of neuronal sodium-potassium ATPase. Thyroid hormone and its specific receptor interaction also demonstrated increase in membrane adenylate cyclase specific activity and increase in cytosolic cAMP concentration in the neuronal fraction which is devoid of nucleus. Characterize the receptor system activated by thyroid hormones in this experiment and support your answer. Note that the neuronal preparation used for the experiment is devoid of nucleus, but contains membrane preparation.

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal

1. this system transports blood through the body and heart. 2. this system relates to the process by which an organism gets rid of its waste. 3.this system is responsible for movement of bones and fluids throughout the body. 4. this system receives and transmits information and responses. it depends upon electrical impulses created by the movement of charged particles. 5. this system relates to the process by which an organism replicates. sexually reproduction usually involves male cells (sperm) meeting female cells (eggs) to produce a fertilized egg or zygote. 6. this system gets oxygen to the cells of the body and rids the body of waste gases. some organisms use their skin. this is also a cell-level process. 7. this system relates to the structure and support of an organism. it is made of salts and proteins and found in vertebrate animals. 8. this is the system of organs which circulate blood around the body of most animals. 9. this system controls the glands that secrete hormones. 10. this organ system to protect the body from damage. itembank : system circulatory digestive system endocrine system excretory integumentary system muscular system nervous system reproductive system respiratory system skeletal system cardiovascular system