Oxygen has an atomic number of eight. When two oxygen atoms come together, they form a/an ________ bond.
A. polar covalent
B. Van der Waals
C. ionic
D. nonpolar covalent
E. hydrogen
Answer: D
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The term prone means lying on the abdomen, face downward.
Answer the following statement true (T) or false (F)
Your family has a strong genetic predisposition to abnormal blood clotting and deep vein thrombosis. How does this affect or determine your chances of suffering from the same conditions?
A. You are guaranteed to experience blood clots and deep vein thrombosis, as the genes producing such conditions are definitely in your genome and will become active at some point. B. You have a higher risk of suffering from these conditions, but you can still take preventative steps to reduce the risk if you know about the genetic predisposition. You are not absolutely guaranteed to suffer deep vein thrombosis because environmental factors can be changed. C. You don't have to worry about these conditions because genetic predisposition doesn't at all affect your chances of developing these conditions if you exercise regularly and eat healthy foods. D. You must expect to die from such conditions if more than 4 or 5 of your relatives have also died from them, as medicine does not yet know how to stop genetic conditions from taking their course.
The most crucial factor determining the resting potential of a neuron is the diffusion of
A. potassium out of the cell through leak channels. B. potassium into the cell through gated channels. C. sodium out of the cell through leak channels. D. sodium into the cell through gated channels.
All of the following are a part of the central nervous system except which one?
A. Sensory neurons B. Cerebrum C. Thalamus D. Medulla oblongata