Combinatorial control of gene expression __________________________
(a) involves every gene using a different combination of transcriptional regulators for its proper expression.
(b) involves groups of transcriptional regulators working together to determine the expression of a gene.
(c) involves only the use of gene activators used together to regulate genes appropriately.
(d) is seen only when genes are arranged in operons.
(b)
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Consider the phylogeny (Fig. 34.15) below. Imagine that the trait "complex multicellular fruiting bodies" actually was present in the common ancestor indicated by the arrow
What would its presence in the common ancestor mean for the evolution of fruiting bodies in the group Dikarya? A. The Glomeromycetes lost complex multicellular fruiting bodies. B. The group Dikarya has members that didn't evolve complex multicellular fruiting bodies. C. The group Dikarya has members that lost the trait of complex multicellular fruiting bodies. D. Because only one trait can evolve at a node, regular septa would have evolved at some other place on the phylogeny.
The average adult carries 10 times more microbial cells (1014) than human cells (average about 1013).
Answer the following statement true (T) or false (F)
Gamma globulin can be given as immunotherapy to confer artificial passive immunity.
Answer the following statement true (T) or false (F)
In the accompanying figure, fertilization occurs within which of the labeled structures?
a. 1 b. 2 c. 4 d. 7 e. 8