Explain the classification animals on the basis of the type of body cavity present. Use correct terminology and give an
example of each. What will be an ideal response?
The classification of animals according to body cavity pertains only to triploblastic
organisms. Such animals can be classified as follows:Acoelomate
animals lack a body cavity; an example is a flatworm
Pseudocoelomate animals have a body cavity that is found between tissue that develops
from endoderm and tissue that develops from mesoderm; an example is a nematode.
Coelomate animals have a body cavity that is completely lined with tissue that develops
from mesoderm; an example is a dog.
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The ratio of toxic dose to therapeutic dose is called the
A. therapeutic index. B. phenol coefficient. C. susceptibility quotient. D. toxicity index.
Attributes of Welwitschia mirabilis include
_____ It has only two leaves. _____ It obtains most of its water from seasonal heavy rains. _____ It lives under desert conditions. _____ It is a gnetophyte. _____ Its stems are photosynthetic, but its leaves are not.
The major function of a receptor is to
a. control the autonomic functions of the body. b. stabilize the internal environment to achieve homeostasis. c. produce responses to the various stimuli the body receives. d. give organisms or cells awareness of and sensitivity to their environment. e. do none of these.
The expression of a given gene may be influenced by
a) Activating transcription factors b) Enhancer sequences c) Histone modifications d) All of the above