When compared to each other, the two replication forks that form at an origin of replication move in which direction?
A. in the 3'-to-5' direction
B. in the 5'-to-3' direction
C. toward the template strand
D. toward the origin
E. in opposite directions
Ans: E. in opposite directions
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A colleague has been attempting to use hydrolysis to decompose large polymers into his constituent monomers, but after each batch, he transfers the product to the scale using an iron spoon, weighs the product, and throws it away. When you ask why he does this, your colleague tells you that each time he’s weighed the reactants before hydrolysis and the products afterward and has found a slight increase in mass, indicative of a contaminant among the monomers that would render them unusable. What mistake has your colleague made?
a. He doesn’t wait for the products of the hydrolysis reaction to cool off before weighing them; hot monomers weigh more than cool monomers. b. He has been using an iron spoon to stir his solutions, which results in iron oxide contamination. c. He has forgotten that hydrolysis bonds hydrogen and hydroxyl groups to the monomers, which would increase their mass proportionally. d. Hydrolysis reactions bond monomers together; he has been inadvertently creating more massive polymers instead.
Independent assortment occurs during which of the following stages?
a) prophase I b) interphase c) metaphase d) metaphase I e) prophase I and prophase II
Which structure is the first to emerge from the germinating seed of a eudicot such as the garden bean?
A) the shoot hook B) cotyledons C) the embryonic root D) the ovary
A(n) ________ ecologist would be interested in how biological communities interact with their physical environment.
Fill in the blank(s) with the appropriate word(s).