Read the two experiments below.

experiment 1: a group of students tested to see if the acidity of water affected pea plant growth. the students followed a logical method and performed their experiment once, using control and experimental groups. their results supported their hypothesis.

experiment 2: a group of students tested to see if bacteria growth in water was affected by acidity. the students used control and experimental groups. they repeated their experiment several times and found the results were the same.
which experiment most likely has greater reliability?

a. number 1 because it follows a logical method
b. number 2 because the experiment was repeated
c. number 2 because the experiment was repeated and the results
were always the same
d. number 1 because it has control groups

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

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)

How does friction with the atmosphere affect the speed of an artificial satellite