A group consisting of a common ancestor and all of its descendants is a
A. order.
B. phylum.
C. species.
D. clade.
E. genus.
D. clade.
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If both homologous chromosomes of each pair exist in the same nucleus, that nucleus is
(a) diploid. (b) unable to undergo meiosis. (c) haploid. (d) none of the above.
The FtsZ protein is present in prokaryotes and in chloroplasts. The protein is structurally and functionally similar to tubulin proteins of eukaryotic cells. Which of the following is a likely conclusion to draw from this information?
(A) FtsZ and tubulin proteins were both present in a common ancestor. (B) Microtubules are involved in the mechanics of photosynthesis. (C) Tubulin genes are evolutionarily derived from the gene that codes for the FtsZ protein. (D) The sequences of the genes encoding the FtsZ and tubulin proteins are identical.
Property of the plasma membrane that allows some substances to pass, but prohibits the movement of others.
What will be an ideal response?
Cytokines are signaling molecules produced by T lymphocytes.
Answer the following statement true (T) or false (F)