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BIOS 1404 Chapter 16
- Muscle cells differ from nerve cells mainly because::
Answer they express different genes
- Cell differentiation always involves::
Answer the production of tissue-specific proteins
3. Apoptosis does not involve?:
Answer lysis of the cell
- Absence of bicoid mRNA from Drosophila egg leads to the absence of anterior larval body
parts and mirror-image duplication of posterior parts. This is evidence that the product of the
bicoid gene:
Answer normally leads to the formation of head structures
- Proto-oncogenes can change into oncogenes that cause cancer. Which of the following
best explains the presence of these potential time bombs in eukaryotic cells?:
Answer Proto-oncogenes normally help regulate cell division
- What does the development of a fertilized egg to turn into an adult require?-
Answer a precisely regulated program of gene expression
7. What are key to developmental process?:
Answer Stem cells
8. Class of undifferentiated cells that differentiate into specialized cells:
Answer Stem cells
- The developmental programs of animals are orchestrated by::
Answer gene expres- sion
- Process by which cells become specialized in structure and function:: 1 / 2
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Answer cell differentiation
11. What is the physical process that gives an organism its shape?:
Answer Morpho- genesis
12. Differential gene expression results from...:
Answer genes being regulated differently in each cell type
13. What does an egg cytoplasm contain?:
Answer -RNA
-PROTEINS
-OTHER SUBSTANCES that are distributed unevenly throughout the unfertilized egg cell
14. Maternal substances in the eggs that influence early development are:
Answer cy- toplasmic determinants
- When a zygote divides by mitosis, the resulting cells contain different cytoplasmic
determinants, this leads to::
Answer different gene expression
16. What is the main source of developmental information?:
Answer the environment around the cell
- What type of molecules cause transcriptional changes in nearby target cells?:
Answer induction-signal molecules from embryonic cells
18. Determination in terms of molecular changes:
Answer is the expression of genes for tissue-specific proteins
19. first evidence of differentiation is:
Answer the production of mRNAs for these proteins
20. How is differentiation observed?:
- / 2