Which of these best describes the nuclear membrane? Choose the correct answer. It is rigid and impermeable. It is identical in composition to the cell membrane. It allows all molecules to pass across it into the nucleus. It contains pores that allow only certain molecules to pass.

Compare the composition of the moon's surface with the composition of the earth's surface.

Use the above pedigree for questions 1,2, and 3 1. what kind of genetic disorder is represented in the pedigree? a. recessive b. dominate refer to the pedigree in question 1. 2. is the mutated gene in this disorder located on a sex chromosome (x or y) or an autosome? a. sex chromosome b. autosome refer to the pedigree in question 1. 3. which generation has individuals that you are certain are heterozygous for the mutated gene? a. generation 1 b. generation 2 c. generation 3

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?