Which of the following ecosystem services is considered indirect and dependent more on maintenance of intact ecosystems and less on availability of particular species?
A) production of food
B) production of fiber
C) production of medicines
D) production of clean air and water
E) all of the above
Ans: D) production of clean air and water
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Match each of the proteins involved in DNA replication with its function
a. DNA helicase b. Topoisomerase II c. Single-stranded binding proteins d. DNA polymerase _____ Attaches DNA nucleotides to an RNA primer _____ Unwinds the DNA duplex _____ Relieves the stress on the replication fork caused by unwinding _____ Proofreads the growing DNA strands and replaces mismatched nucleotides _____ Prevents strands of DNA from rejoining after being unwound What will be an ideal response?
Bacteria reproduce
A. Asexually and sexually B. By binary fission C. Sexually only D. By conjugation E. Spore Formation
In some genetically engineered tomatoes, fruit ripening was delayed by crippling the gene that produces which hormone?
A. cytokinin B. gibberellin C. abscisic acid D. ethylene E. auxin
When the glottis becomes narrower,
A. the volume of sound decreases. B. the volume of sound increases. C. the pitch of sound goes up. D. the pitch of sound goes down. E. all sound ceases completely.