14464621
Description
Flashcards by USMLE STEP1, updated more than 1 year ago
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Created by USMLE STEP1
over 7 years ago
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| Question | Answer |
| Gene Expression occurs in the nucleus throughout... | Interphase (There is no Gene Expression during the M Phase) |
| DNA Replication occurs during... | S-phase |
| Nitrogen-containing bases with 2 rings in their structure. | Purines |
| Nucleotides linked by 3′, 5′ phosphodiester bonds | Nucleic Acids |
| A sample of DNA has 35% C; what is the % U? | 15 % |
| Formed when 1 or more phosphate groups is attached to the 5′ carbon | Nucleotide |
| Neurons; Skeletal muscle cells; Cardiac myocyte cells; Liver cells, are cells found in which phase of the Cell Cycle? | G0 phase (Resting Cells) |
| Cells in G0 goes through transcription, translation and replication. T or F ? | FALSE They don't do replication because they don't grow. |
| One nucleotide binds with another nucleotide by... | A phosphodiester bond |
| Complementary bases binds with... | Hydrogen bonds |
| What is the difference of a 30 nm chromatin to a 10 nm chromatin? | The presence of H1 histone (condenses the nucleosomes) |
| Nucleosomes are formed by... | An octomer formed by 2 copies of each histones: H2A, H2b, H3, H4. |
| Barr bodies (inactive X chromosomes) are found in the heterochromatin. T or F ? | TRUE HeteroChromatin = Highly Condensed Inactive Genes |
| Insuline genes are found in the Heterochromatin of β-Pancreatic Cells. T or F ? | FALSE Euchromatin is Expressed. Gene Expression because the DNA is exposed!!! |
| All genes are present in every cell in the body T or F | TRUE |
| Methotrexate (MTX), trimethoprim (TMP), and pyrimethamine interferers with nucleotide synthesis by... (EXTRA) | Disrupting pyrimidine synthesis (S phase) |
| Medicine that acts disrupting purine and pyrimidine synthesis (EXTRA) | Hydroxyurea (S phase) |
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