If 20% of the air is composed of O2, the partial pressure of oxygen at sea level where atmospheric pressure is 760 mm Hg is
a. 20 mm Hg.
b. 760 mm Hg.
c. 70 mm Hg.
d. 350 mm Hg.
e. 152 mm Hg.
E
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Proteins that assist the movement of a substance across the membrane are called _________ proteins
A. catalytic B. cytoskeleton C. transport D. identification E. intercellular attachment
Paralysis of which of the following would make an individual unable to flex the thigh?
A) biceps B) vastus medialis C) soleus D) iliopsoas and rectus femoris
Once the promoter region of a gene is activated, ________ unwinds the DNA of the downstream gene and begins the process of ________. What is the molecule generated by this process? How does the cell control the amount of this molecule released from the nucleus?
What will be an ideal response?
Which of the following occurs in intramembranous ossification?
A) Hyaline cartilage model forms. B) Periosteum forms a collar around the cartilage. C) Fibrous connective tissue is converted to bone tissue, which first resembles spongy bone. D) As the bone enlarges, osteoclasts break down some of the spongy bone and create a marrow cavity. E) Ossification centers are formed as blood vessels and osteoblasts enter the centers of the epiphyses.