During endocytosis, if a bacterial cell is not degraded and bacterial DNA is taken up by the eukaryotic cell, what may have occurred?
A. horizontal gene transfer.
B. vertical evolution.
C. vertical exon shuffling.
D. chromosomal duplication and genomic exchange.
E. both chromosomal duplication and vertical evolution.
Answer: A
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Cells taken from a tumor
A. may be used to grow viruses. B. can be cultivated in vitro indefinitely. C. may be used to grow bacteriophages. D. divide 50 times and then die. E. may be used to grow viruses AND can be cultivated in vitro indefinitely.
An example of local control over breathing is ____
a. automated lung ventilation and perfusion adjustments to changing O2 levels in the blood b. the aortic bodies signaling an increase in breathing rate when blood pH is acidic c. refinement by the interneuron groups of the pons of contractions involved in inhalation and exhalation d. the carotid bodies signaling an increase in breathing rate when O2 levels are low e. the ventral group of interneurons signaling an increase in breathing rate and depth during exercise
What enzymes are used to cut DNA molecules? How do they work?
What will be an ideal response?
People with sickle-cell trait
A) are heterozygous for the sickle-cell allele. B) are usually healthy. C) have increased resistance to malaria. D) produce normal and abnormal hemoglobin. E) all of the above