Which of the following represents a cross to determine if an individual is homozygous dominant or heterozygous?
A. Aa x Aa
B. Aa x aa
C. aa x aa
D. Aa x AA
E. AA x AA
Answer: B
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The descriptive term ectotherm, when applied to reptiles, refers to the fact that:
a. they are warm-blooded b. they derive their body heat from outside of their body by certain behaviors c. their central body core works best when its temperature is the same as the ambient temperature d. their optimum temperature for muscle contraction occurs only when the sun provides direct solar heat e. they maintain their temperature by adjusting the production of metabolic heat
B cells have antigen receptors that bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells. T cells have antigen receptors that _____
A) are active only in lymph nodes B) bind only to antigens present on the surface of the invading or foreign cells C) bind only to freely dissolved antigens in the plasma D) bind to antigen fragments presented on major histocompatability (MHC) complexes by host cells E) bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells
True or false: Most proteins will retain metabolic activity when denatured
A. true B. false
The number and variety of species within a community is its:
1.Biodiversity 2.Ecosystem biodiversity 3.Genetic variation 4.Species richness