Which of the following kinds of information can be revealed through a family pedigree analysis?
a. the chromosomal location of disease-related allele
b. sex linkage
c. the DNA sequence of disease-related allele
d. the source of the original mutation in the disease-related allele
Ans: b. sex linkage
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The cytoskeleton has several primary functions. The first and most obvious is that it acts as an interior skeleton that supports the rest of the cell. What is another function of the cytoskeleton?
A. It connects one cell to another. B. It creates a durable outer covering to increase the strength and rigidity of the cell. C. It provides a communication network whereby chemo-electrical signals can be sent from one area of the cell to another. D. It provides a series of tracks along which vesicles can move throughout the cell.
Which of the following is a FALSE statement about prokaryotes?
A) Prokaryotic cells contain ribosomes. B) Prokaryotes are so small that they can be seen only with a high-power electron microscope. C) Prokaryotes may contain extra genes in plasmids. D) Prokaryotes have a plasma membrane, similar to that of eukaryotes.
A growth-producing region of cell division, known as a/an ________, is found near the tips of stems and roots
A) sporangium B) cuticle C) apical meristem D) lignin
A keystone species that is a predator will
A) maintain the species diversity in a community. B) harvest prey species to extinction. C) help many of its prey reproduce. D) reduce the diversity of the community.