Which of the following protein families are not involved in directing transport vesicles to the target membrane?
(a) SNAREs
(b) Rabs
(c) tethering proteins
(d) adaptins
(d) Adaptins are involved in vesicle budding and are removed during the uncoating process, and thus should not be present when the vesicle reaches its target.
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J. H. Connell proposed that competition occurred between barnacle species; he based that on:
a. the observed distribution of the species and environmental measurements. b. laboratory test he had concluded. c. a conversation with other scientists. d. the observation that they were in the rocky intertidal. e. laboratory observations of their fighting behavior.
The cuticle of a plant functions primarily for ____
a. retention of water b. conduction of water and minerals c. absorption of oxygen d. photosynthesis e. structural support
Which of these is NOT one of the characteristics of a vertebrate?
A. closed circulation B. segmentation C. extreme cephalization D. radial symmetry E. coelom
This cellular structure lacks a membrane:
endoplasmic reticulum chloroplast nucleus nucleoid Golgi body