In eukaryotic cells, which of the following organelles contain DNA?
A. Nucleus, mitochondria, and Golgi apparatus
B. Nucleus, endoplasmic reticulum, and Golgi apparatus
C. Nucleus, chloroplast, and peroxisome
D. Nucleus, chloroplast, and mitochondrion
E. Nucleus, nucleolus, and Golgi apparatus
Answer: D
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Which factor is responsible for reductions in population size?
a. immigration b. death
c. birth d. reproduction e. dispersion
Describe the docking and fusion of synaptic vesicles with the cell membrane. Describe the mechanisms by which tetanus toxin and botulinum toxin interfere with this process
What will be an ideal response?
Two sea urchin proteins were named cyclin A and B because, during the embryonic cell cycle, they were periodically
a. activated and inactivated by phosphorylation and dephosphorylation. b. synthesized and degraded. c. bound and released by another protein. d. ubiquitylated and non-ubiquitylated.
Components of the first line of defense include all the following, except
A. nasal hairs. B. phagocytic white blood cells. C. flushing action of tears and blinking. D. flushing action of urine. E. the tough cell sheet of the upper epidermis of the skin.