Gram-positive bacteria would stain ____ in a gram stain because of a thick layer of ____ in their cell walls
a. green; cellulose
b. red; polysaccharides
c. green; peptidoglycan
d. purple; peptidoglycan
e. purple; polysaccharides
d
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In the ABC model of floral development, flower development in Arabidopsis is regulated by _____ activities controlled by ____ genes
A. 3; 3 B. 3; 4 C. 4; 3 D. 4; 4 E. 3; 5
There are three alleles controlling the ABO blood types. IA and IB are codominant genes so that the
combination IAIB produces the AB blood type. The third allele, IO, is recessive to the other two alleles. Indicate which of these parents could produce the given child:Parents Child Yes or No (a) A ? AB B (b) A ? O A (c) A ? B O (d) A ? AB O (e) A ? AB B (f) B ? B O Observing Patterns in Inherited Traits 115 (g) AB ? AB A What will be an ideal response?
The “leaves” of ferns are known as
a. rhizomes. b. rhizoids. c. fronds. d. sori. e. none of these.
Celiac disease (CD) is a common, usually inherited human disorder of intestinal inflammation that is triggered by eating gluten, a major protein in wheat and other cereal grains. It is the most frequent food intolerance
One of the three genes involved is for SH2B3, a protein involved in innate, nonspecific immune response to bacterial pathogens. Celiac sufferers frequently have a particular allele of this gene. It is so common that which of the following might be hypothesized? A) The gene must be common to all primate genomes. B) The gene must be common in most mammalian genomes. C) The allele must have been positively selected for during a period of especially frequent bacterial infections. D) The wild-type allele must have been selected against during periods of frequent bacterial infections. E) The gene must code for a T-cell receptor for a common bacterial component.