BISC 162 • Exam 2 Prep || A+ Graded Already.

In an embryonic sense, cleavage refers to: A) meiosis II occurring within an egg cell followed by the entry of a sperm B) one cell dividing into two C) the rapid division of a zygote into a many celled embryo D) the fusion of the pronuclei E) the differentiation of ectoderm and endoderm correct answers C) the rapid division of a zygote into a many celled embryo Which of the following are the fundamental embryonic tissues called the "germ layers"? A) mesoderm, endoderm, ectoderm B) ectoderm, endoderm, and exoskeleton C) tissues, organs, and organ systems D) mesoderm, muscle, and tissue E) mesoderm, exoderm, and hydroderm correct answers A) mesoderm, endoderm, ectoderm All of the following statements about exoskeletons are correct except A) exoskeletons are made of chitin B) chitin is a polysaccharide C) exoskeletons do not limit growth because they are flexible D) exoskeletons are shed by many arthropods in a process called ecdysis E) muscles are attached to the exoskeleton correct answers C) exoskeletons do not limit growth because they are flexible A tube-within-a-tube digestive system is found in all of the following except A) earthworm B) human C) hydra D) nematode correct answers C) hydra A cell that contains a complete set of genetic instructions to direct normal development is A) meroblastic B) differentiated C) totally awesome D) totipotent E) holoblastic correct answers D) totipotent The _ is a blind pouch just beyond where the small intestine joins the colon. This is a vestigial structure in humans and in some herbivores holds cellulose-digesting bacteria. A) chyme B) lacteal C) appendix D) cecum E) jejunum correct answers D) cecum