Which best describes functions of the smooth (agranular) endoplasmic reticulum?
A. Generation of ATP
B. Digestion of engulfed bacteria and cellular debris
C. Synthesis of lipids and intracellular storage of calcium ions
D. Synthesis and packaging of proteins for secretion from the cell or export to other organelles
E. Transcription of DNA into RNA
Answer: C
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Achalasia
a. is a condition in which the lower esophageal sphincter closes more tightly during swallowing. b. is a condition in the ruminant stomach which prevents the pyloric sphincter from opening and closing properly. c. refers to the incomplete digestion of protein by ruminants. d. is the protection from ingested toxins provided by the epithelium lining of the intestinal tract. e. none of these.
Which of the following bone belongs to the appendicular skeleton?
A) vertebrae B) cranium C) ribs D) clavicle
Fertilization can only occur
A. when a sperm cell penetrates a secondary oocyte. B. when there is no menstrual flow. C. if orgasms occur in both the male and female. D. after oxytocin is released from the hypothalamus. E. on day 14 of the cycle.
Which of the following basal nuclei is located in the cerebrum?
A. subthalamic nucleus B. red nucleus C. caudate nucleus D. substantia nigra E. habenular nuclei