You find a forest with a few different tree species: maple, oak, hickory, and tulip polar. you determine that the maples are abundant in the understory, and the hickories have the largest biomass.
which of the following statements can you make about this forest?

a. the maples and the hickories are possible dominant species, depending on how you are analyzing the structure of the forest.
b. there is not a dominant species in the forest, as there is species diversity, and dominance requires a species diversity of zero with one dominant.
c. the hickories are clearly the only dominant species, as they have the greatest biomass.
d. the maple is clearly the dominant species, as it is the most abundant.
e. the dominance of this forest is four.

Which of the following would be an important part of a multi-step plan to restore the stability of the red-cockaded woodpecker's ecosystem?

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.