What is the letter associated with the dark bands in a sarcomere?
A. I
B. A
C. Z
D. M
E. H
B
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One example of a membrane-bound organelle is a ribosome
Indicate whether this statement is true or false.
Bones continue to increase in length even after an animal reaches maturity
Indicate whether the statement is true or false
All of the following are true of the pigment melanin except that it
A) decreases in concentration within cells during exposure to the sun. B) is usually some shade of brown or black. C) protects DNA from the damaging effects of UV radiation. D) is released through melanosomes. E) is produced by cells called melanocytes.
Non-REM sleep
A. is a time when the brain is very active. B. is characterized by movements of the eyes. C. is where we have our most memorable dreams. D. comprises most of our sleep time.