clep 2

In fish of the species perissodus microlepis, some individuals have mouths that open to the right and some individuals have mouths that open to the left. The direction of the mouth opening is a genetic trait controlled by a single gene. The allele for a right opening mouth ® is dominant to the allele for a left opening mouth ®. If two fish heterogeneous for the mouth trait are crossed, what is the expected ratio of phenotype in the offspring?

• 1 right opening mouth : 3 left opening mouth

• 2 right opening mouth: 2 left opening mouth

• 3 right opening mouth: 1 left opening mouth

• 4 right opening mouth : 0 left opening mouth

Which of the following is incapable of reproducing outside of a host cell?

• Alga

• Mold

• Moss

• Virus

The nose serves all the following functions except…

• Proves an airway

• Moistening inhaled air

• Filtering dust and particles from the inhaled air

• Transferring oxygen from the air to the bloodstream

Hemoglobin is a protein that carries oxygen in red blood cells. The hemoglobin molecules produced by some have one specific amino acid that is different from the one at that position in normal hemoglobin. Which if the following is the most likely cause of this amino acid variation?

• The hemoglobin gene contains a mutation.

• An error occurs during the folding of the hemoglobin protein.

• Enzymes replace the amino acid once the hemoglobin is produced.

• An additional amino acid is mistakenly inserted into the hemoglobin during translation.

An invasive species of green algae has become established along the coasts of the Mediterranean Sea. Which of the following statements best explains why this species of algae has been so successful in the Mediterranean Sea?

• It is not a good competitor.

• It is not eaten by many animals.

• It reproducer slowly in warm waters.

• It requires more nutrients than most other algae.

Every year, monarch butterflies from Canada and the United States spend the winder of central Mexico. The dry and mild climate in Mexico allows the monarch butterflies to survive the winter. One winter, a week of storms caused freezing temperatures and 43 cm of snow in Mexico. What was the most likely impact of these storms of the monarch butterflies?

• Monarch butterflies died in large numbers.

• Monarch butterflies immediately migrated back to the United States.

• Monarch butterflies did not migrate from Canada and the United States next year.

• Monarch butterflies evolved several new adaptations to survive the winter in Mexico.

Which of the following best describes the formation of a zygote?

• A sperm cell nucleus and an egg cell nucleus fuse.

• A cell’s DNA replication and mitosis are accelerated.

• A succession of cell divisions produces a solid mass of the cells.

• A cell with 46 chromosomes divides to form cells with 23 chromosomes each.

A researcher is studying a particular disease-causing agent. The agent has a protein coat, but it lacks a nucleus, contains no other organelles, and can reproduce only when it is inside an animal cell. The researcher should classify the agent as which of the following?

• a bacterium

• a fungus

• a protist

• a virus

Which of the following normally results from meiosis in a human cell that contains 46 chromosomes?

• an egg cell with 46 chromosomes.

• a liver cell with 23 chromosomes.

• a blood cell with 46 chromosomes.

• a sperm cell with 23 chromosomes.

The bones that make up the forelimbs of monkeys, cats, whales, and birds are similar. Which of the following statements best supports the evolutionary relationship of these animals?

• The animals have different ancestries but have adapted to similar environments.

• The animals share a common ancestry but have adapted to different environments.

• The animals at one time lived in different environments but now share an environment.

• The animals use their forelimbs for identical activities but live in different environments.