In eukaryotic cells,
a. the bulk of the control of gene expression is at the level of transcription just like in
prokaryotes
b. mRNAs tend to remain stable for about the same length of time
c. mRNAs can have their activities altered through modifications such as phosphorylation
d. promoters of genes that are transcribed remain part of heterochromatin
e. genes that are involved in similar processes are clustered together in operons
A
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A population of mosquitoes is exposed to the pesticide DDT for several generations. At the end of that time, most individuals in the population are resistant to DDT. The most likely reason is that:
A. DDT caused the mutations that lead to resistance. B. some individuals in the original population had the mutations that lead to resistance. C. by chance, new mutations that lead to DDT resistance arose after DDT was used. D. somatic mutations in the original population were passed on to subsequent generations. E. random mutations in each generation made mosquitoes resistant to DDT.
Island biogeography predicts that a single large area would have higher biodiversity than several small areas. However, in practice, several small areas could have an advantage for what reason(s)? Check all that apply.
_____ Facilitating the spread of disease _____ Decreasing extinction risk from natural disasters _____ Being less expensive _____ Containing more habitat types _____ Minimizing edge effects
The apple maggot was used as an example of allopatric speciation
Indicate whether the statement is true or false.
Some organisms are capable of orchestrating alterations that are collectively termed antigenic variation. This allows the organism to __________.
A) rapidly move through the host's tissues B) drastically decrease its ID50 C) enter the host's body through more than one portal of entry D) evade the host's immune system