Bacterial cells protect their own DNA from restriction enzymes (endonucleases) by _____
A) adding methyl groups to adenines and cytosines
B) using DNA ligase to seal the bacterial DNA into a closed circle
C) adding histones to protect the double-stranded DNA
D) forming "sticky ends" of bacterial DNA to prevent the enzyme (endonuclease) from attaching
A
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If you want your population of plants to be genetically diverse, you should utilize the process
known as
a. asexual reproduction. b. cloning. c. sexual reproduction. d. vegetative reproduction
What type of molecule can rapidly cross a plasma membrane?
a. large, polar molecules. b. small, polar molecules. c. large, hydrophilic molecules. d. small, hydrophilic molecules. e. small, hydrophobic molecules.
Microtubules are present in
What will be an ideal response?
A demonstration of the second law of thermodynamics is
A. the amount of energy coming from the sun. B. that carnivores require more energy than herbivores. C. that there is more producer biomass than herbivore biomass in an ecosystem. D. the high proportion of protein in the diets of Americans.