DNA replication is said to be semiconservative because
a. the number of nucleotides within genes remains constant.
b. half of the DNA in a cell comes from one parent and the other half from the other parent.
c. the same process of DNA replication is used by all organisms.
d. the total amount of DNA within an individual remains the same.
e. each new DNA molecule is composed of one old strand and one new strand.
E
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What are vascular bundles that are strengthened with sclerenchyma fibers called in leaves?
a. veins b. vessels c. xylem d. phloem e. sclerenchyma
Cloned B cells which produce antibodies that are specific to a particular antigen are called _______ cells.
Fill in the blank(s) with the appropriate word(s).
Parkinson disease (PD) is a neurodegenerative disease that has been associated with a significant number of different genes, therefore showing it to be genetically heterogenic
One recent study in 278 families found evidence of two such possible loci. Evidence for linkage to chromosome 18q11 was presented by Gao et al. in 2009. Which of the following would be considered reputable evidence for this? A) lack of quantitative difference for the occurrence of both loci in individuals B) use of persons from multiple ethnic and geographic backgrounds in the study C) finding the locus to be in Hardy-Weinberg equilibrium in the population D) finding the lod score for association between the chromosomal location and PD to be 4.1 E) analysis of all other possible SNPs with no such association to chromosome 18
The major function of the protonephridia in the flatworm is to:
a. conserve water. b. conserve salts. c. eliminate waste materials such as ammonia and urea. d. eliminate excess water. e. regulate the pH of the gastrovascular cavity.