Which type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids?
a. ribosome
b. lysosome
c. smooth endoplasmic reticulum
d. mitochondrion
e. contractile vacuole
c. smooth endoplasmic reticulum
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Which type of receptor is involved in rapid responses of muscle cells and neurons? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
In humans the pharyngeal slits mostly disappear during development, except for one pair that in the adults forms:
A. a cleft palate B. the Eustachian tubes C. the thyroid gland D. the glottis E. the opening to the voice box
B and T lymphocytes are specific; they have only a single type of cell marker on their surface.
Answer the following statement true (T) or false (F)
What features of a desert ecosystem control the communities which can survive in a desert?
A. amount of light B. temperature C. amount of water D. All answers are correct. E. amount of usable habitat