Which of the following is a reason to graft
plants?
a. to maintain the quality of a plant
b. to increase the hardiness of a plant
c. to avoid plant diseases
d. to produce seedless fruits
e. all of these are reasons to graft plants
E
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John Bernal suggested that prebiotic synthesis of polymers took place on clay because
A. Clay minerals are known to bind organic molecules. B. Clay is negatively charged and attracts cations. C. Some minerals in clay attract organic monomers and catalyze chemical reactions. D. Clay minerals can attract and bind organic molecules, catalyze chemical reactions and attract cations. E. Clay is positively charged and can bind organic molecules for polymerization.
A bundle of ____ extends from the base to the tip of a eukaryotic flagellum or cilium
a. microtubules b. microfilaments c. actin d. cytokeratin e. intermediate filaments
Aneuploidy is the term for a condition in which cells have ________
a. too few complete sets of chromosomes b. too many or too few copies of a single chromosome c. three or more complete sets of chromosomes d. a translocation resulting in a deletion and a duplication
In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH4 (ammonia) to electrical sparks. A few days later, they found ________________ in their system.
a. cells b. rRNA c. DNA d. tRNA e. amino acids