Which of the following statements is consistent with the hypothesis that certain eukaryotic organelles originated as prokaryotic endosymbionts?
A) are roughly the same size as bacteria.
B) can be cultured on agar since they make all their own proteins.
C) contain circular DNA molecules.
D) have ribosomes that are similar to those of bacteria.
E) A, C, and D
Ans: E) A, C, and D
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What is the purpose of molecular chaperones?
a. To transfer an amino acid b. To attach a carboxyl group c. To straighten other molecular proteins d. To strengthen the tertiary structure of a protein e. To assist the folding of other molecular proteins
How does the energy of an electron relate with the distance from the nucleus?
A. The closer an electron is from the nucleus, the greater its energy. B. The farther an electron is from the nucleus, the greater its energy. C. The farther a proton is from the nucleus, the greater the electron's energy. D. The closer a proton is from the nucleus, the greater the electron's energy. E. The closer a neutron is from the nucleus, the greater the electron's energy.
The tuberculin response is mediated by
A) memory T cells. B) mast cells. C) B lymphocytes. D) plasma cells. E) eosinophils.
The phenol coefficient is one of the most widely used measurements of an antimicrobial agent's effectiveness
Indicate whether the statement is true or false