PLEASE HELP!! ITS DUE BY 5! Cells of all organisms have various mechanisms to control their metabolism. Some animals go into hibernation in response to changing environmental conditions. Their metabolism slows down to decrease their need for food. Which statement best explains this ability to change metabolism?

Animals that hibernate have genes that code for hibernation.

Phenotypes control the hibernation genotype, determining metabolism regulation.

Genes that regulate metabolism are multi-factorial and adjust to environmental changes.

Genes that regulate metabolism can mutate to adjust to temperature and lack of food.

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

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.

18. which statement about cancer is true?