In cell fractionation, which cellular structure or molecule is isolated in a pellet after the first centrifugation?
a. nuclei
b. mitochondria
c. ribosomes
d. proteins
e. nucleic acids
ANSWER: a
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Despite oomycetes being called "water molds," they are phylogenetically distant from most other fungi
Indicate whether the statement is true or false.
Which of the following is not true of the imprinting of the mammalian gene for insulin growth factor-2 (IGF-2)?
A. CTCF binds to the methylated IGF2 gene insulator. B. IGF2 gene is activated when the insulator is methylated. C. The maternally inherited copy of IGF2 is normally repressed in egg cells. D. The insulator of both the paternal and maternal IGF2 alleles lies between the promoter and the enhancer.
What factor allows the dominant mutant allele for Huntington's disease to persist in human populations
despite its devastating effects? a. Heterozygote advantage. b. The fact that its symptoms do not typically show until after the individual has had children. c. Its effects are not expressed in heterozygous individuals. d. Its effects are only expressed in homozygous recessive individuals. e. Its effects are only expressed in homozygous dominant individuals
Cartilage, bone, and blood are examples of ________ tissue
A) connective B) epithelial C) nerve D) muscle E) undifferentiated