Homoplastic structures are a result of ____ evolution
a. derived
b. divergent
c. convergent
d. multiphyletic
e. the absence of
c
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The heritability of a trait is the ____
a. sum of all phenotypic variation in a population b. average amount of genetic variation in each individual c. proportion of phenotypic variation that is caused by different genotypes d. absolute measurement of genotypic variation in a population e. proportion of phenotypic variation that is caused by the environment
If IP3 binds a Ca2+ ligand-gated ion channel in the endoplasmic reticulum, then cytosolic Ca2+ levels will rise in the cell.
Answer the following statement true (T) or false (F)
How do birth control pills prevent fertilization?
A. They alter the uterine environment so that sperm cannot survive. B. They prevent implantation. C. They inhibit menstruation. D. They prevent follicle development and ovulation. E. The provide hCG, indicating that fertilization has already occurred.
Methylene blue can be used to stain DNA because it
A) forms ionic bonds with DNA. B) changes the pH and therefore the structure of DNA. C) covalently bonds with DNA. D) makes DNA electron dense. E) is an effective fixing agent for nucleic acids.