Which of the following statements about the endoplasmic reticulum (ER) is false?
(a) The ER is the major site for new membrane synthesis in the cell.
(b) Proteins to be delivered to the ER lumen are synthesized on smooth ER.
(c) Steroid hormones are synthesized on the smooth ER.
(d) The ER membrane is contiguous with the outer nuclear membrane.
Choice (b) is false. Proteins to be delivered to the ER lumen are synthesized on roughER; these areas appear "rough" because ribosomes are attached to the cytosolicsurface of these ER regions.
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The presence of a tympanic membrane in insects and vertebrates is an example of:
A. divergent evolution. B. coevolution. C. convergent evolution. D. adaptive radiation.
When fluorescently labeled oligonucleotides that are known to be specific to the microbe of interest are used to label natural samples, the technique is known as ________.
A. fluorescent in situ hybridization (FISH) B. epifluorescence microscopy C. gel electrophoresis D. polymerase chain reaction (FISH)
A road that dichotomizes is
a. an intersection of two crossroads. b. a road that forks into two roads. c. a road that has numerous entrances and exits. d. a road that leads nowhere.
Which sterilization technique involves cutting the vas deferens on each side to prevent sperm from leaving the body?
A) hysterectomy B) tubal ligation C) vasectomy D) testicular deactivation