In trisomy 21, while all genetic information is intact, a(n) abnormal copy of this chromosome creates a genetic
imbalance which causes abnormal physical and mental development.
_________________ Indicate whether the statement is true or false.
False - extra
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Sympatric populations are able to coexist without competing for resources due to morphological differences known as
____.
a. niches b. character displacements c. resource partitions d. mimics e. parasitoids
Aging may be attributed to
a. genetics. b. free radical damage. c. a decline in DNA repair mechanisms. d. changes in structural proteins. e. all of these.
Which of the following is the correct sequence in a cyclin-Cdk pathway?
A) Receptor ? cyclin ? Cdk ? growth factor ? DNA replication B) Growth factor ? receptor ? cyclin ? Cdk ? DNA replication C) Growth factor ? cyclin ? Cdk ? receptor ? DNA replication D) Growth factor ? receptor ? Cdk ? cyclin ? DNA replication
In the human genetic disease sickle cell anemia, a single change in the genetic sequence of the hemoglobin-beta gene results in the amino acid valine being substituted for the amino acid glutamic acid in the beta chain of the hemoglobin protein. Which
level(s) of the protein structure will be affected? A) primary structure B) secondary structure C) tertiary structure D) quaternary structure E) primary, secondary, tertiary, and quaternary structures