Autosomal aneuploidies arise by:
a. chromosome breakage and rejoining.
b. nondisjunction.
c. errors in crossing-over.
d. mistakes in chromosome replication.
e. mutations.
B
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In this figure showing SDS-PAGE of the progressive stages of glycine N-methyltransferase purification, the marker lane indicates that the purified protein:
A. has approximately 32,000 amino acids. B. has a molecular mass of approximately 32,000. C. has a positive charge and a molecular mass of approximately 32,000. D. has a negative charge and a molecular mass of approximately 32,000. E. is only present when cells are induced with glycine.
An approach in which scientists make observations about the natural world, develop tentative
explanations about what they observe, and then test those explanations by collecting more information is referred to as ____.
a. science b. education c. the scientific method d. the method e. the biological method
What is the name for the modified stems that run along the ground and occasionally produce new strawberry plants at irregular intervals?
a. corms b. rhizomes c. runners d. tubers
In meiosis homologous chromosomes align next to one another during
A. interphase I. B. metaphase II. C. prophase I. D. metaphase I. E. prophase II.