Cell movement involves the coordination of many events in the cell. Which of the following phenomena is not required for cell motility?
(a) Myosin-mediated contraction at the rear of the moving cell.
(b) Integrin association with the extracellular environment.
(c) Nucleation of new actin filaments.
(d) Release of Ca2+ from the sarcoplasmic reticulum.
(d) The release of Ca2+ from the sarcoplasmic reticulum is important for muscle contraction, not cell motility.
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Segmentation is the subdivision of the body into segments or metameres. True segmentation is found in which of the following phyla?
A. Annelida, Mollusca, Arthropoda B. Echinodermata, Platyhelminthes, Cnidaria C. Mollusca, Chordata, Annelida D. Arthropoda, Chordata, Porifera E. Arthropoda, Annelida, Chordata
Nematodes have an outer nonliving layer called a cuticle that must shed as the animal passes
from one juvenile stage to the next. This cuticle is produced by the epidermal cells that originate from which germ layer?
a. endoderm b. mesoderm c. ectoderm d. epiderm
Which of the following is/are TRUE?
What will be an ideal response?
Rennin is added to cheese to help preserve it.
Answer the following statement true (T) or false (F)