Practice Quiz

MCAT Biology - Question List

Select how would you like to study

Study Mode Free Daily Question Test Mode
36. Which of the following statements best describes why the change in only one DNA base of the hemoglobin gene results in a different protein product of the gene?
  1. The change prevents mRNA from being made.
  2. The change alters the amino acid sequence of the protein.
  3. The change causes the blood cells to divide in an uncontrolled way
  4. The change creates a second strand of mRNA for each RNA molecule.
See answer
37. Which of the following cell structures carries out the process represented by the arrows labeled “2” in the diagrams?
  1. mitochondrion
  2. nucleus
  3. ribosome
  4. vacuole
See answer
38. Which of the following statements best summarizes a change that is represented by the arrows labeled “3” in the diagrams?
  1. A nucleus is formed in each cell.
  2. Each cell divides to form two daughter cells.
  3. A chain of amino acids is folded to form a protein in each cell.
  4. Proteins are transported through the plasma membrane of each cell.
See answer
39. Which of the following statements best compares individual Y and individual Z in terms of genotype and phenotype?
  1. The individuals have the same genotype and the same phenotype.
  2. The individuals have the same genotype but different phenotypes.
  3. The individuals have different genotypes but the same phenotype.
  4. The individuals have different genotypes and different phenotypes.
See answer
40. About 70 years ago, cane toads were introduced to Australia. The toads are toxic to some species of snakes, such as Dendrelaphis punctulatus. The longer an individual snake is, the greater its chance of survival after eating a cane toad. Which of the following did scientists most likely observe in the D. punctulatussnake population as a result of the presence of the cane toads?
  1. The entire population was killed by the toads.
  2. The entire population became resistant to the toads.
  3. The average body length in the population increased.
  4. The average body length in the population decreased.
See answer

Select how would you like to study

Study Mode Free Daily Question Test Mode