A2.2.9 - Atypical Cell Structure in Eukaryotes Flashcards
Use numbers of nuclei to illustrate one type of atypical cell structure in aseptate fungal hyphae, skeletal muscle, red blood cells and phloem sieve tube elements.
1
Q
Atypical Structure in Red Blood Cells
Mature red blood cells
A
- anucleate - no nucleus
→ greater haemoglobin capacity
→ does contain one when being made in the bone marrow but it travels to the edge and gets pinched off by a phagocyte
2
Q
Atypical Structure in Phloem Sieve Tube Elements
Phloem sieve tube elements
A
- anucleate - no nucleus
→ helps transport dissolved substances in plants
→ no nucleus causes low resistance for substances moving thru a sieve tube element
→ lacks many cell organelles (i.e. nuclei, mitchondri, ribosomes)
→ lack of cell organelles make them dependent on companion cells to survive; companion cells help maintain the cytoplasm of the sieve tubes
3
Q
Atypical Structure in Skeletal Muscle
Skeletal muscle
A
- multinucleated
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