The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds in ________.
A. carbohydrate
B. lipid
C. DNA
D. protein
Answer: D
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Cells that have a crawling movement include (select all correct choices):
A. amoebas foraging for food. B. white blood cells in pursuit of invading pathogens. C. migrating embryonic cells. D. nerve cells transporting neurotransmitters. E. contracting muscle cells.
All CpG sites located near the promoter region of protein coding genes are methylated
A. true B. false
What causes the large majority of errors in DNA replication?
1.chemical carcinogens 2.the speed of the replication process 3.the complexity of the replication machinery 4.mutations in proofreading and repair genes
The same procedure was repeated with a second protein (protein Y). If the function of Y is protein processing and packaging, the most radioactivity would be found in the
a. Golgi apparatus b. Nucleus c. Mitochondria d. Lysosomes e. Cytoplasm