What field of study uses geographic distribution of extinct and living species to determine patterns of evolution?
A. Biogeography.
B. Geology.
C. Biology.
D. Geneology.
E. Palentology.
Answer: A
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Describe the makeup of the phospholipid bilayer. Include molecular orientation and proteins as well
What will be an ideal response?
Hydrolysis requires __________ to break down macromolecules
a. hydrogen b. nitrogen c. oxygen d. water
Acacia trees often have ants that live on them. The ants feed on materials produced by special structures called nectaries, which the tree produces. The ants will attack other animals that begin to feed on the tree and will even cut off small branches of other trees that come in contact with "their" tree. The relationship between Acacia trees and ants is called
A. mutualism. B. competition. C. predator/prey. D. parasite/host.
PCR involves a heating step, followed by a cooling step, and then DNA synthesis. What is the primary reason for why this cooling step is necessary?
(a) Cooling the reaction ensures the integrity of the covalent bonds holding the nucleotides together in the DNA strand. (b) Cooling the reaction gives the DNA polymerase an opportunity to rest from the previous cycle so that it will be ready for the next round of synthesis. (c) Transcription takes place during the cooling step. (d) Cooling the reaction brings the temperature down to a level that is compatible with the short primers forming stable hydrogen bonds with the DNA to be amplified.