Virtually all enzymes are:
A) carbohydrates.
B) nucleic acids.
C) proteins.
D) substrates.
C) proteins.
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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
Describe reproduction in the sea star.
What will be an ideal response?
Animals that possess homologous structures probably __________.
Fill in the blank(s) with the appropriate word(s).
The body loses fluids by four of the following means. Which is the exception?
a. urine b. evaporation from lungs c. retention of salts d. sweating e. elimination of feces