The smooth endoplasmic reticulum
a. is most abundant in cells specialized for protein secretion.
b. gives rise to transport vesicles containing newly synthesized molecules wrapped in a layer of smooth ER membrane.
c. consists of stacks of relatively flattened sacs called cisternae.
d. has many ribosomes.
e. all of these answers.
B
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__________ cells, which migrate to the skin from bone marrow, are dendritic cells that serve as antigen-presenting cells
Fill in the blank(s) with correct word
Ribosomal RNA is synthesized in the region of the nucleus called the ______
Fill in the blank(s) with the appropriate word(s).
When ligands bind to them, ________ receptors directly phosphorylate enzymes within the cell.
A. enzymatic B. G protein-coupled C. channel-linked D. phosphatase
The subunits of ribosomes are exported outside the nucleus into the cytoplasm, where they are assembled into their finished product.
Answer the following statement true (T) or false (F)