Why would a scientist trying to isolate osteoblasts look between the periosteum and the bone in a young animal to find them?
What will be an ideal response?
In growing bones, new bone tissue is deposited more heavily on the outside, or periosteal surface, of a bone. Since it is the osteoblasts that add bone tissue, they are found in higher proportions on the periosteal surface of the bone.
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Adaptive radiation is best described as the
A. existence of groups of closely related species recently evolved from a common ancestor. B. existence of groups of distantly related species recently evolved from a common ancestor. C. existence of groups of closely related species recently evolved from different ancestors through hybridization. D. existence of individuals of closely related species that originated in different areas within diverse habitats, but that have rejoined as a single species.
The cytoskeleton
a. extends between the nucleus and the plasma membrane. b. is found within the nucleus. c. is associated with only certain cell structures. d. is found within organelles. e. is found in all animal cells but not in cells with cell walls.
Making a protein from mRNA is known as ____
a. translation b. transcription c. polymerase d. replication e. promoter
Choose the correct order of the chambers through which oxygen-poor blood flows in an amphibian heart
a. atrium ? ventricle ? sinus venosus ? conus arteriosus b. atrium ? conus arteriosus ? ventricle ? sinus venosus c. sinus venosus ? atrium ? ventricle ? conus arteriosus d. conus arteriosus ? atrium ? sinus venosus ? ventricle e. ventricle ? atrium ? conus arteriosus ? sinus venosus