Ruminants digest bacterial cells as a primary source of
A) carbohydrates.
B) vitamins and proteins.
C) proteins.
D) vitamins.
Answer: B
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The sickle-cell allele is pleiotropic (that is, it affects more than one phenotypic trait). Specifically, this allele affects oxygen delivery to tissues and affects one's susceptibility to malaria. Under conditions of low atmospheric oxygen availability,
individuals heterozygous for this allele can experience life-threatening sickle-cell "crises." Such individuals remain less susceptible to malaria. Thus, pleiotropic genes/alleles reveal that _____. A) new advantageous alleles do not arise on demand B) evolution is limited by historical constraints C) adaptations are often compromises D) chance events can affect the evolutionary history of populations
Interbreeding groups of organisms of the same species living in the same geographical area are called ____
Fill in the blank with the appropriate word.
The reproductive organ in the human female that is responsible for egg production is the ____
a. uterus b. ovary c. vagina d. clitoris e. oviduct
After responding to complement, the main function of dendritic cells is to present antigen to which cells in an adaptive immune response?
A. Mast cells B. Basophil C. B cells D. NK cells E. T cells