Which of these is the correct explanation of mass change in developing eggs as illustrated in the graph?
A) A is the correct representation of mass change because as the baby bird develops inside the egg, it grows new parts.
B) B is the correct representation of mass change because the baby bird uses cellular respiration to fuel the biosynthesis of new parts and gives off mass as CO2.
C) C is the correct representation showing that nothing new comes into the egg and nothing leaves the egg, so it retains the same mass.
Answer: B
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A. capable of independent reproduction. B. obligate intracellular parasites. C. interdependent with one another for reproduction. D. larger than most bacteria in size.
What step occurred first in the evolution of life?
a. formation of DNA b. formation of protein-RNA systems c. formation of membrane-bound proto-cells d. spontaneous formation of organic compounds under abiotic conditions e. formation of ATP
A human cell containing 22 autosomes and a Y chromosome is
A) a somatic cell of a male. B) a zygote. C) a somatic cell of a female. D) a sperm cell. E) an ovum
Which of the following enzymes and their functions is mismatched
A. Helicase-unwinds the supercoiled DNA B. DNA ligase--joins nucleic acids together C. DNA polymerase-removes bases from DNA D. RNA polymerase-synthesizes primer E. RNA polymerase-synthesizes okazaki fragments