A cell in the pancreas that secretes an enzyme to hydrolyzes lipids would be expected to have
a. a larger-than-normal nucleus
b. an extensive rough ER
c. a greater-than-normal number of free ribsomes
d. an extensive smooth ER
e. a and d
B
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Explain why a pseudostratified epithelium is not truly stratified
A) All the cells do not contain a nucleus. B) All the cells are not columnar. C) All the cells form a single layer and contact the basement membrane. D) All the cells' nuclei are round instead of elongated. E) All the cells are not linked by tight junctions.
What is a gene?
A) A gene is a sequence of three nitrogenous bases along a DNA strand. B) A gene is a polypeptide formed by linked amino acids. C) A gene is a sequence of three nitrogenous bases along an RNA strand. D) A gene is a portion of a DNA strand that functions as a hereditary unit and codes for a specific protein. E) A gene is the sequence of tRNAs needed to form a polypeptide.
Milk ejection is a neural reflex arc involving afferent input to the hypothalamus from receptors in the nipples and a neural efferent output to the myoepithelial cells in the ducts of the mammary glands
Indicate whether the statement is true or false.
When a cell is placed into a(n) ________ solution, the cell maintains its size.
A. hypertonic B. isotonic C. hypotonic