Biology (DOST JLSS Reviewer)

This Biology Practice Test is comprised of 50 random questions from General Biology. It is comprised of questions from topics such as Cell/Cell Cycle/Cell Transport System; Energy Transformation; Organismal Biology; Genetics; and Evolution. Please read the questions carefully and choose the correct answer from the choices below. The correct answer will be marked green; otherwise, it will be marked red. Good luck! 

How is ATP hydrolysis used to power other cellular reactions?
Which of the following is true regarding carrier protein transport?
Some snakes, like boa constrictors, have small non-functional leg bones near their tail ends. What term best describes the leg bones found in these snakes?
Which of the following are roles of amino acids at an enzyme's active site?
The enzyme ptyalin helps digest carbohydrates, while the enzyme pepsin helps digest proteins. What prevents ptyalin and pepsin from digesting the same type of food?
Mumps is a disease caused by:
Amoeba proteus is a species of amoeba that gets its energy by engulfing small, unicellular organisms with its membrane. It then digests these organisms using internal vesicles. What is the name of the process used by Amoeba proteus to get its energy?
Which of the following describes the common ancestor of all eukaryotes, but not the common ancestor of all organisms?
In natural selection, one variation which is present in ALL members of a population is a called a -
During the cell-mediated immune response, killer T-cells target and kill infected cells. This process is shown in the image below. During an experiment, researchers introduced a substance that caused the Class I MHC molecule to break down. Which of the following best describes how the cell-mediated immune response will be affected?
Pepstatin binds to the enzyme pepsin. The substrate is still able to bind to the active site, but the reaction is blocked. What is this an example of?
Most toxins and poisons like cyanide, nerve gas etc. are non-competitive, irreversible inhibitors of key enzymes and are, therefore, lethal. Which type of molecular interaction is likely responsible for their irreversible binding with the enzyme molecules?
A scientist hydrolyzes ATP in a laboratory test tube. He finds that about 3 times as much heat is released than when the same amount of ATP is hydrolyzed in a cell. What best explains the scientist's observation?
What is the primary function of cofactors?
A botanist is studying the genetics of a particular species of plant. She knows that one plant may contain hundreds of individual seeds, each of which is the result of a separate fertilization event. She determines that seed color is controlled by a single gene with two alleles. The dominant allele results in black seeds, and the recessive allele results in brown seeds.
In a follow-up experiment, the botanist crosses a homozygous dominant plant with a heterozygous plant.
Which of the following is the best prediction for the frequency of brown seeds that would result from this cross?
The following is an excerpt from a scientific paper written by Levy et al.
The plant cell wall is a barrier to virus exit from and entry into cells. Thus, successful infection requires that plant viruses encode movement proteins to transport the viral genome locally cell-to-cell within a leaf and on into the vascular system, through which the virus will systematically invade the plant.
Which of the following best predicts how movement proteins help plant viruses travel from one plant cell to another?
During cell communication in the nervous system, chemical messengers called neurotransmitters travel between neurons. As they travel, neurotransmitters send messages from one neuron to another. Which of the following best describes the role of neurotransmitters in neuron-to-neuron communication?
Several genes are responsible for preventing cells from dividing when conditions are not right. Two examples are tumor suppressor genes and proto-oncogenes. Which of the following accurately compares tumor suppressor genes and proto-oncogenes?
Which statement is true regarding catabolic pathways?
Weeds growing among crop plants can cause significant losses in crop yields. One way that farmers can remove weeds from their fields is through the use of herbicides.
One class of herbicides, the acetolactate synthase (ALS)-inhibitors, target the enzyme ALS. Normally, the ALS enzyme carries out the first step of valine, leucine, and isoleucine synthesis. However, when a plant’s ALS enzymes are inhibited, the plant cannot make these amino acids and dies.
Which of the following best predicts what will happen to a weed population in a field that is, over time, consistently sprayed with an ALS-inhibiting herbicide?
Which of the following is true about the kingdom Bacteria?
The following table indicates the presence or absence of selected traits for a set of animal species. The data about which trait provides the strongest evidence that all of the animal species in the table share a common ancestor?
How does an enzyme affect the rate of a reaction?
A group of students are studying flower color inheritance in the garden pea plant (Pisum sativum). They obtain a purple-flowered pea plant of unknown ancestry, allow it to self-pollinate, and collect 60 6060 of its seeds. After planting the seeds, they observe the growth of 42 4242 purple-flowered plants and 18 1818 white-flowered plants.
Which of the following best explains the flower colors seen in the offspring?
Huntington’s disease is a rare inherited disorder caused by an autosomal dominant allele of the huntingtin gene. As individuals with the disease age, their neurons degenerate at an accelerated rate compared to individuals without the disease.
Which of the following pedigrees shows a likely pattern of inheritance in a family with a history of Huntington’s disease?
A genetic mutation causes a snake to have brown skin. After many generations, most of the snake population has the brown skin mutation. Which of the following most likely caused this change?
Which of the following statements is true regarding anabolism?
The U shaped pipe shown in the figure below is divided with a membrane that is only permeable to water. Which of the following best describes how water will flow through the membrane?
Gametogenesis, or the formation of gametes, occurs when diploid germ cells undergo meiosis. In fruit flies (Drosophila melanogaster), diploid germ cells contain eight chromosomes.
Which of the following correctly describes the number of chromosomes in the daughter cells produced during gametogenesis in fruit flies?
The existence of microorganisms in the human gastric system is an example of:
Which of the following statements is true regarding the energy source used in primary vs. secondary active transport?
Which of the following is true regarding the proteins involved in facilitated diffusion?
Ptyalin is an enzyme produced in the:
Which component of a nucleotide contains the information needed to make proteins?
Which of the following choices correctly describes the composition of a ribosome?
Some substances such as sugars, amino acids, and ions move across the cell membrane from an area of high concentration to an area of low concentration using special proteins embedded in the membrane. Which of the following terms applies to this type of cell transport?
The flower of a plant is involved in reproduction. Which parts are male and which are female?
Tahira placed a collection of red blood cells into a container filled with an unknown solution. Once in the container, Tahira noticed that the red blood cells swelled and some of them burst. What type of solution were the red blood cells placed in?
Which of the following are components of adenosine triphospate (ATP)?
Which of the following correctly describes meiosis?
Starch turns a blue-black color in the presence of iodine. Julian decides to use this information to test the permeability of some dialysis tubing. He fills the tubing with a starch solution and places it in a beaker of iodine and water. After two hours, the starch solution in the dialysis tubing turns blue-black. The iodine solution remains the same color (it doesn't change colors). What do Julian's results show about the permeability of the tubing?
What is the relationship between anabolic and catabolic pathways?
What type of microscope would be most effective for studying a living cell?
Which of the following molecules is used as "energy currency" for the cell?
The data above represent the results of three different crosses in which a single gene determines whether a certain organism is blue or yellow.
Which of the following best describes how this gene is inherited from parents to offspring?
The graph below shows a metabolic pathway. Which of the following does the graph most likely represent?
A pigeon zygote contains 80 chromosomes. How many chromosomes did the zygote receive from its mother?
What level does the mice primarily eat in?
Emma believes viruses are not living organisms while Kayla believes viruses are living organisms. Who is correct and why?
Even though humans are approximately 99.9 % 99.9%99, point, 9, percent identical in their genetic makeup, an incredible amount of variation is seen among individuals of the species. This genetic variation is greatly influenced by the process of meiosis. Of the following events that occur during meiosis, which contributes most to genetic diversity in the human population?