Researchers Tilman and Downing have demonstrated which of the following?
A) more stable biomass production during drought in high-diversity systems
B) more stable biomass production during winter in high-diversity systems
C) more stable biomass production under fertilization in high-diversity systems
D) more stable biomass production under pesticide application in high-diversity systems
Ans: A) more stable biomass production during drought in high-diversity systems
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NOTE: The following questions with Punnet squares reflect on a consistent observation that students can commonly use Punnet squares easily, but frequently make mistakes setting them up
STEM/DATA In a population of wild-caught flies, you are focusing on the trait of bristle length. You find that the trait varies between two phenotypes where some flies have long bristles while others have very short bristles. You set up several matings between individual flies from this mixed population and observe the following results in the offspring: Mating # male parent female parent offspring phenotypes 1. long long all long 2. long long all long 3. short short some long, some short 4. short short all short 5. long short all short 6. long short some long, some short 7. short long some long, some short 8. short long all short The male and female offspring have the same chance of having either long or short bristles in each cross. Which phenotype is recessive? A. long B. short
If a eukaryote cell contains a non-functional mutated form of RNA polymerase II, what result is most likely?
a. The cell will be unable to assemble ribosomes. b. The cell will synthesize non-functional tRNAs. c. The cell will be unable to transcribe most genes. d. The cell will only be impacted during mitosis.
Sponges biggest hardship is being in constant competition with ________
a. sunlight b. food c. calcium carbonate d. space on solid materials
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