Which statement concerning cell division and cancer is incorrect?
A) Normal cells are limited in how many times they can divide.
B) Cancerous cells can become immortal.
C) Oncogenes protect against cancer.
D) Apoptosis can be used to kill cancerous cells in the body.
C
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Organisms that can grow in habitats with low water activity by maintaining a high internal salt concentration are called ________ organisms.
Fill in the blank(s) with the appropriate word(s).
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
Lymphocytes ignore which of the following in most
instances? a. cells coated with complement proteins b. cells with antigens on their surface c. “self” cells with MHC markers d. cells with both antigen and self-MHC markers e. cells with damaged or mutant self-MHC markers
Identify three reproductive isolating mechanisms and briefly outline how each may contribute to the formation of new
species. What will be an ideal response?