Which of the following organelles sorts, cuts, splices, and packages newly formed proteins into membrane-bound vesicles?
A. Golgi complex
B. Smooth ER
C. Mitochondrion
D. Rough ER
E. Nucleolus
Answer: A
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Filtration occurs because
A. the afferent arteriole is wider in diameter than the efferent arteriole. B. the filtration slits allow materials from the blood plasma to enter the capsular space. C. the capillary wall is not completely ensheathed by the visceral layer of the glomerular capsule. D. the glomerulus is leaky. E. All of the choices are correct.
When the plasma membrane is at rest, activation gates of the voltage-gated Na+ ion channels are __________ and inactivation gates are __________.
A) closed; closed B) closed; open C) open; closed D) open; open
The ________ nervous system regulates motility of esophagus, stomach, and intestines without input from brain or spinal cord.
Fill in the blank(s) with the appropriate word(s).
Which statement is true concerning the genetic code?
A)Protein synthesis plays a small but important part in the metabolic machinery of the cell. B)DNA serves as the master blueprint for the synthesis of carbohydrates, lipids and proteins. C)DNA is said to specify only the structure of protein. D)The chemical structure of cells is primarily determined by lipids while the physical nature of cells is determined by proteins.