Eukaryotic chromosomes are composed of:
a. proteins only.
b. chromatin.
c. DNA only.
d. circular chromatin.
e. karyotypes.
b
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Rickettsias are ________ intracellular bacteria.
Fill in the blank(s) with the appropriate word(s).
Birth control injection (e.g. Depo-Provera) is __________.
[A] effective for 3 months [B] obtained without a prescription [C] given in the arm [D] a way of preventing STDs
Mitochondria are proposed to have evolved before chloroplasts based on which observation?
A. All organisms have mitochondria and conduct cell respiration. B. Mitochondria are larger, with more complex structures than chloroplasts. C. Mitochondria produced the oxygen found in the atmosphere. D. All eukaryotes have mitochondria, but not all eukaryotes have chloroplasts. E. All prokaryotes have mitochondria, but not all prokaryotes have chloroplasts.
Why is it important that a few ?-galactosidase molecules be present in E. coli even if these cells have been growing on
a lactose-free medium? What will be an ideal response?