What were the genotypes of the sinistral female and dextral male that were initially chosen?
A) dd female and Dd male
B) Dd female and dd male
C) dd female and DD male
D) DD female and dd male
E) Dd female and Dd male
B
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Suppose that frog embryos were genetically manipulated so that the epidermal cells expressed both E-cadherin and N-cadherin on their cell surface
The neuronal tissue and epidermal tissues were collected from the embryos and treated as illustrated in Figure 10.15b. Which of the following would you predict would happen now that N-cadherin is also present on the surface of the epidermal cells? A. The modified epidermal cells would adhere to each other and to neuronal cells. B. The genetically modified epidermal cells would adhere to neuronal cells and would no longer adhere to epidermal cells. C. The epidermal cells would adhere to each other, and not to the neuronal cells, because they would still be epidermal cells regardless of the presence of an additional cell adhesion protein on their surface.
Toxic dinoflagellates can directly harm other organisms during bloom periods by secreting their toxins in the water or by being consumed and concentrated in the tissues of filter-feeding organisms. Can you think of ways in which blooms of non-toxic dinoflagellates may harm other organisms in the water?
What will be an ideal response?
A molecule whose concentration determines the developmental fate of a cell is called
A) monomorphic. B) a maternal effect gene. C) a signaling molecule. D) a morphogen.
Which organelle deals with the reproduction of the protist?
A. Macronucleus B. Contractile Vacuole C. Oral Groove D. Micronucleus