The ________ is the first embryonic membrane to appear, and it is the first site of ________.
A. yolk sac, blood cell formation
B. allantois, amniotic fluid formation
C. yolk sac, placenta development
D. amnion, umbilical cord formation
E. chorion, neural system development
Answer: A
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To determine the specific growth rate of a bacterial population, it is essential to know
A) cell concentrations at varied time points. B) total number of cells in the population at varied time points. C) cell concentrations at varied time points or the generation time. D) turbidity measurements and the total number of cells in the population at varied time points.
Methanogens may contribute to the greenhouse effect and global warming due to methane production.
Answer the following statement true (T) or false (F)
The full chemical name of DNA is
A) derived nucleic acid. B) dideoxyribonucleic acid. C) denatured ribonucleic acid. D) deoxyribonucleic acid.
Refer to Figure 7-2. The line on the graph labeled B represents the:
a. activation energy with an enzyme.
b. activation energy without an enzyme.
c. free energy of the reactants.
d. change in entropy.
e. change in enthalpy