In which year was the density of birds greatest?
a. 20
b. 100
c. 105
d. 160
e. cannot be determined from this graph
Ans: c. 105
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What is the selective advantage of a mature red blood cell being flat rather than a sphere?
A. It maximizes the relative surface area available to exchange gases. B. It provides more sites for the membrane-bound hemoglobin molecules which transport oxygen. C. It saves energy by making more membrane relative to the volume of the cell. D. It provides more membrane for the electron transport chains where oxygen is consumed. E. The cell's surface area to volume will decrease, making it easier for the cell to fit through arteries and veins.
Transfer RNA (tRNA) molecules are called "connectors" because they bind
A. promoters at one end and terminators at the other end. B. promoters at one end and amino acids at the other end. C. DNA at one end and mRNA codons at the other end. D. codons of mRNA at one end and amino acids at the other end. E. amino acids at one end and DNA at the other end.
The smaller a homeotherm, the ________ the loss of heat to the surrounding environment
Fill in the blank(s) with correct word
Formation of NADP When NADPH _____ electrons and hydrogen ions in the carbon reactions, NADP+ is formed through _____.
a) accepts, reduction b) donates, oxidation c) accepts, oxidation d) donates, reduction