Exam 1: Biology

In the human body, fibrinogen is necessary for sealing cuts and stopping the loss of blood. Since fibrinogen is made of chains of amino acids, it is an example of which type of organic molecule?

A species of parasitic fly follows the sounds that male crickets make with their wings. The flies deposit their larvae in the crickets' bodies. As the larvae develop and emerge from the crickets' bodies, the crickets die.Researchers have discovered a genetic mutation in some crickets that changes their wing structure and makes them silent. The crickets with silent wings are found among crickets with normal wings when it is time to mate.According to evolution by natural selection, which of the following will most likely occur in the cricket population, based on the selection pressure from the flies?

Scientists have concluded that snakes evolved from an ancestor with legs. Which of the following statements provides the best evidence for this conclusion?

The water cycle would not occur if which of the following were missing?

Which of the following provides the most conclusive evidence that organisms of two different species share a common ancestor?

Which of the following is the basic structural unit of the nervous system?

High levels of carbon dioxide in the blood trigger which of the following responses in the body?

Which of the following would most likely happen if grasses and shrubs were removed from a rural Massachusetts ecosystem?

Which of the following statements best compares sensory neuron function and motor neuron function in the human body?

Unlike dairy milk, soymilk provides some of the body's daily requirement for iron. In which of the following functions of the human body does iron serve a primary role?

An endangered species is most vulnerable to extinction when it has which of the following characteristics?

All organisms have ways to produce ATP. Which of the following statements describes why ATP is a critical compound for all cells?

Which of the following best explains how the fossil record provides evidence that evolution has occurred?

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 (R) is dominant to the allele for a left-opening mouth (r). If two fish heterozygous for the mouth trait are crossed, what is the expected ratio of phenotypes in the offspring?

Frogs, lizards, and birds all have a similar arrangement of bones in their limbs. Which of the following does this similarity most likely indicate about these animals?

A pedigree is a diagram that traces the inheritance of a trait through a family. Which of the following patterns is typical in a pedigree for an autosomal dominant trait?

Some willow trees alter the chemical composition of their leaves when attacked by caterpillars. Compared to normal leaves,the chemically altered leaves are less nutritious and are more difficult for caterpillars to digest.Which of the following is a likely effect of this ability to alter leaf composition?

Why is the particular sequence of bases in a segment of DNA important to cells?

Which of the following best explains why enzymes are necessary for many cellular reactions?

Lobsters and spiders are both classified in the phylum Arthropoda. Lobsters and spiders are therefore also classified in the same