Which best explains why the crossing over of two homologous chromosomes occurs?
A. Sister chromatids are replicated in mitosis.
B. Sister chromatids are replicated in meiosis.
C. Chromosomes align closely together in tetrads during meiosis.
D. Chromosomes align closely together in tetrads during mitosis.
Ans: C. Chromosomes align closely together in tetrads during meiosis.
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The ribonucleoprotein, RNase P, catalyzes the:
A. exonucleolytic removal of the 3' end of tRNA molecules. B. endonucleolytic removal of the 5' end of tRNA molecules. C. ATP-independent removal of tRNA introns. D. degradation of the poly(A) tail.
____ are involved in all aspects of growth, development, and function in plants. They often work together, with synergistic or opposing effects on cells
a. Enzymes b. Starches c. Sugars d. Peptides e. Hormones
In the analysis of quantitative traits, positions on chromosomes called quantitative trait loci (QTLs) are often discussed. In the same context, restriction fragment length polymorphisms (RFLPs) are also discussed
What is the relationship between QTLs and RFLPs?
A photosystem is _____.
a) the innermost portion of the mitochondria b) the portion of the enzyme to which the activator molecule binds c) a collection of pigment and protein molecules that absorbs solar energy d) the central, semi-fluid compartment of the choloroplast