Threadlike and bloblike structures containing DNA and other organic molecules enclosed in a
membrane are
a. protocells.
b. nanobots.
c. nanobes.
d. chimera.
e. blebs.
C
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Bioluminescence, as seen in squids, is possible because:
A. specialized cellular organelles of squids carry out a chemical reaction that results in light production. B. symbiotic bacteria housed in specialized organs of the squid are capable of generating light. C. squids produce a fluorescent product during cellular respiration. D. squids produce a mucous layer that reflects light energy.
Place the processes occurring in the digestive tract in the correct order.
I-Peristaltic waves of contraction propel the food along the esophagus. II-Gastric juices are secreted with the arrival of food into the duodenum. III-The acidic chyme is transferred through the pyloric sphincter. IV-HCl and pepsin begin digestion of proteins into shorter polypeptides. A. II, IV, and III B. IV, III, and II C. II, III, and IV D. I, II, and IV E. I, II, and III
________ is the ultimate source of genetic variation in populations
A) Natural selection B) Genetic drift C) Gene flow D) Mutation E) Recombination
Peptidoglycan is a polysaccharide found only in bacteria.
a. true b. false