Immunity results from the actions of cells that circulate throughout the body, primarily through the blood and lymph
Indicate whether the statement is true or false.
Answer: TRUE
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In animals, one group of homeobox genes, the Hox gene family, regulates the development and location of structures
such as legs and wings along the anterior-posterior axis of the body.
a. True b. False
In Gibson’s experiment with small mammal populations in the tropical forest, ____
a. most species disappeared from small islands within the first 5-7 years after fragmentation b. all species disappeared from small islands within the first 5-7 years after fragmentation c. populations increased 25 years after fragmentation d. most species disappeared from small islands, but quickly recolonized after 5-7 years e. fragmentation had no affect on small mammal species
The Bcl-2 gene product in its normal form can be activated to prevent cells from undergoing apoptosis (programmed cell death) in specific circumstances. It is a carefully regulated gene, being "turned on" only under specific circumstances
A null mutation in Bcl-2 leads to excessive cell loss. Some Bcl-2 mutation can cause a "gain of function" in which the protein is active all the time. a. In the terms used in this chapter, what would the normal version be called? b. What would the gain-of-function mutation be called? c. How would you expect the gain-of-function mutation to be involved in cancer?
The mechanism that allows chromatin exchange during meiosis in eukaryotes is ________
Fill in the blank with correct word.