How is cell division different in plants versus animal cells?
What will be an ideal response?
1. Unlike animal cells, no centrosome or centrioles are present in most types of plants.
Instead, the spindle forms from microtubules originating from multiple MTOCs
surrounding the nucleus.
2. Cytokinesis occurs by different pathways in plants and animals; animals (including
protists and many fungi) form a cleavage furrow composed of microfilaments of actin,
which surround the cell and gradually deepen until it cuts the cytoplasm in two. In plants,
a new cell wall called the cell plate forms between the daughter nuclei and grows until it
divides the cytoplasm.
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Chargaff's rules for the pairing of nitrogen bases is
A. A = C and G = T. B. A = T and G = C. C. A = G and C = T. D. A+T = G+C.
The binding of one O2 to hemoglobin makes it easier for additional O2 to bind
A. true B. false
Summarize the effects of each of the six classes of plant hormones. What will be an ideal response?
The oldest fossils are about ________ billion years old.
A. 1.8 B. 3.5 C. 13 D. 0.5