A student is sitting in his canoe on a lake and wants to move the canoe forward. He moves his arms front and back on the handle of the paddle to propel the canoe forward. Then the
student wants to stop the canoe. He stops paddling and the canoe slows. He takes his
paddle and drives it in the shallow bed of the lake to anchor the paddle which stop the
canoe from moving.
Which of these best identifies a pathway of systems in the rider’s body, as described in this
scenario?
A. nervous system → musculoskeletal system → circulatory system → nervous system
B. nervous system → musculoskeletal system → nervous system → musculoskeletal system
C. musculoskeletal system → circulatory system → musculoskeletal system → nervous system.
D. musculoskeletal system → nervous system → circulatory system → musculoskeletal system

Which codon is the code for the amino acid histidine (his)?

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime