A membrane that allows only certain molecules to pass through it is called ________.
A. permeable
B. countertransport
C. selectively permeable
D. porous
Answer: C
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Bile salts function as digestive enzymes to break down fatty acids.
Answer the following statement true (T) or false (F)
The _________________ is unique to eukaryotes
a. plasma membrane b. cytoplasm c. ribosomes d. nucleus e. genetic material
How do keratinocytes acquire melanin?
a. Keratinocytes acquire melanin precursors (e.g., tyrosine) from melanocytes via plasma membrane amino acid transporter proteins b. Keratinocytes phagocytize cytoplasmic processes of melanocytes that contain melanosomes c. mRNA molecules that code for melanin proteins are exported from melanocytes to keratinocytes d. Melanocytes synthesize melanocyte-stimulating hormone., which binds to recep-tors on keratinocytes e. Melanocytes undergo apoptosis and export melanosomes via a holocrine mode of secretion
The AV valve that is located on the same side of the heart as the origin of the aorta is the
A. bicuspid or mitral valve. B. tricuspid valve. C. aortic semilunar valve. D. pulmonary semilunar valve. E. coronary sinus valve.