Archives

Which of the following is a population? A) the termites infesting your house along with the microorganisms living in their guts B) all of the termites that have ever lived C) all organisms living in your house D) the termites […]

You encounter an insect with small eyes, long sensory antennae, and a long mouthpart shaped like a sword. What can you conclude about the environment in which it lives? A) The environment is dark and has many plants. B) The […]

In bacteria, what name is given to a cluster of genes with related functions, along with their DNA control sequences? A) operon B) operator C) promoter D) exon Which of the following is produced during the light reactions of photosynthesis? […]

Which is the most abundant kind of tissue in most animals? A) connective B) epithelial C) blood D) muscle What name is given to the region where sea meets land? A) pelagic realm B) intertidal zone C) benthic realm D) […]

Which of the following best describes the role of plant root nodules in plants such as peas and beans? A) They house nitrogen-fixing bacteria. B) They help absorb nutrients from the soil. C) They house mycorrhizae. D) They store nutrients. […]

White blood cells play a particularly important role in ________. A) fighting infections B) supporting the activity of red blood cells C) carrying carbon dioxide D) blood clotting Which of the following is an example that results from directional selection? […]

The stomach mixes food with the secretions of the stomach wall to form ________. A) gastric juice B) a food ball C) chyme D) acid gastrin Please read the following paragraph and then answer the following questions. Birth control methods […]

Which one of the following is most similar to the mechanism of an enzyme inhibitor? A) keeping someone from parking by parking in their designated spot B) driving the wrong way on a one-way street C) forgetting to put a […]

Which one of the following statements is TRUE? A) Cones are more sensitive to light than rods. B) Rods can distinguish color. C) There are three different types of cones in the human eye. D) The human retina is completely […]

Plant viruses ________. A) often use RNA, rather than DNA, as their genetic material B) benefit plants, rather than causing disease C) cause diseases that can be easily cured D) do not exist, as viruses attack only animals Read the […]

Which of the following is hydrophilic? A) cellulose B) testosterone C) butter D) cholesterol Seeds develop from ________. A) carpels B) anthers C) ovules D) ovaries Answer: C The sum total of all the chemical reactions that occur in organisms […]

Diffusion ________. A) is the result of the potential energy of atoms B) requires an input of cellular energy C) occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated D) proceeds […]

Which of the following have thick secondary cell walls strengthened with lignin, and support plants like steel beams in a building? A) parenchyma cells B) collenchyma cells C) sclerenchyma cells D) water-conducting cells What type of reproductive isolating mechanism is […]

A cell that neither gains nor loses a net amount of water at equilibrium when it is immersed in a solution is ________. A) isotonic to its environment B) hypertonic to its environment C) hypotonic to its environment D) metabolically […]

A DNA fragment with a sticky end that reads -ATTCG will bind with another DNA fragment with a sticky end that reads ________. A) TAAGC- B) CGGAT- C) GCCTA- D) ATTGC- What type of symmetry does this organism exhibit? A) […]

The principle that energy cannot be created or destroyed is known as ________. A) cellular respiration B) conservation of energy C) conservation of heat D) entropy A protist that contains contractile vacuoles most likely lives ________. A) in a marine […]

Read the following scenario to answer the following questions. As part of a semester-long biology field research course, you are studying reproductive barriers among four different frog species. Your goal is to determine what type of reproductive barrier likely causes […]

One problem with eradicating invasive species is that sometimes the disturbed area is unable to be colonized by native species. For example, in forests where the invasive plant garlic mustard has been removed, native plants and animals do not recolonize […]

Use the following information to answer the following questions. Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic organisms are transmitted from one person to another by the female Anopheles mosquito […]

Which of the following would likely be the most difficult to kill if you were you to can your own food? A) streptococci B) endospores C) biofilms D) staphylococci The Antarctic icefishes are the only known vertebrates to lack hemoglobin. […]

Menstruation ________. A) involves the breakdown of the endometrium B) is stimulated by HCG C) occurs after ovulation but prior to degeneration of the follicle D) is triggered by an LH surge Read the following scenario to answer the following […]

How does Helicobacter pylori cause gastric ulcers in humans? A) It neutralizes the acids of the stomach. B) It causes the production of excess acid in the stomach. C) It damages the stomach’s mucus coat. D) It causes the stomach […]

Which of the following is an aspect of asexual reproduction that is sometimes disadvantageous? A) It allows animals that do not move around to produce offspring without finding mates. B) It allows an animal to produce many offspring quickly. C) […]

How can bacteriophage DNA be spread from cell to cell without causing cell death? A) by altering the way a cell splices its RNA B) via a lytic cycle C) via a lysogenic cycle D) by changing the length of […]

Which of the following best describes transpiration? A) the loss of oxygen from a plant B) evaporation from a plant’s roots C) the bulk flow movement of water in a plant D) the loss of water from plant leaves through […]

On average, what percentage of the energy in one trophic level becomes incorporated into the next higher trophic level? A) 10% B) 30% C) 50% D) 90% Please read the following scenario to answer the following question. The parents of […]

The four most common elements found in living organisms are ________. A) nitrogen, oxygen, phosphorus, and carbon B) carbon, oxygen, nitrogen, and hydrogen C) carbon, oxygen, potassium, and calcium D) oxygen, calcium, hydrogen, and carbon The tendency of molecules of […]

If your blood pressure were 120/70, it would mean that ________. A) your blood pressure during systole is 120 and your blood pressure during diastole is 70 B) you have high blood pressure C) you have low blood pressure D) […]

Which of these techniques could tell you how gene expression differs between individuals with and without cystic fibrosis? A) therapeutic cloning B) DNA microarray C) reproductive cloning D) karyotyping The type of reproductive barrier that occurs when two species mate […]

Examine the figure below. If blood glucose levels decline, ________. A) the pancreas releases more glucagon, which causes glucose to be released into the blood B) the pancreas releases more insulin, which causes glucose to be released into the blood […]

Please read the following scenario to answer the following questions. Michigan’s Isle Royale is an island located in Lake Superior that is 45 miles long and 9 miles wide. Ecologists estimate that the moose population on the island has been […]

The ________ help(s) plants retain water. A) hypha B) cuticle C) mycorrhiza D) lignin Why is RNA thought to have been the first genetic material? A) RNA is structurally simpler than DNA. B) RNA has been found on meteorites. C) […]

Which of the following form tubes and are alive when mature? A) parenchyma cells B) collenchyma cells C) water-conducting cells D) food-conducting cells In Texas, a man showed up at a medical facility claiming that he felt drunk when he […]

What was the first stage of the process that led to the abiotic origin of life? A) synthesis of monomers, such as amino acids and nucleotides B) origin of self-replicating molecules C) synthesis of polymers, such as proteins and nucleic […]

Which one of the following is TRUE? A) An enzyme’s function depends on its three-dimensional shape. B) Enzymes work generally on a broad range of substrates. C) Enzymes are used up in chemical reactions. D) Enzymes emerge changed from the […]

Which of the following is a colonial form of green algae? A) Volvox B) Giardia C) Paramecium D) Plasmodium Examine the figure below. According to the figure, cladistic analysis indicates that crocodiles are more closely related to ________ than to […]

The figure below illustrates ________. A) transcription factors B) activators C) alternative RNA splicing D) protein activation Digestion begins in the ________. A) oral cavity B) esophagus C) pharynx D) stomach Answer: Answer: C Sustainable development ________. I) will require […]

Read the following scenario to answer the following question(s). Endotoxins are commonly found in the air, both inside and outside our homes. These “air endotoxins” can come from sources that include house dust mites, agricultural and industrial dust, and dust […]

This graph represents three different populations. Use it to answer the following questions. If all populations occupy different areas that are approximately the same size, which population will have the lowest density after 3 years? A) Population A B) Population […]

The 2n number for the cell depicted here is ________. A) one B) two C) four D) eight Some friends are trying to make wine in their basement. They’ve added yeast to a sweet grape juice mixture and have allowed […]

Functionally, what is the muscle fiber’s fundamental unit of contraction? A) thick filament B) thin filament C) myofibril D) sarcomere Anaphase II is essentially the same as mitotic anaphase except that in anaphase II ________ and in mitotic anaphase ________. […]

Which group of fishes includes a lineage that migrated out of fresh water and adapted to life on land? A) ray-finned fishes B) jawless fishes C) lobe-finned fishes D) cartilaginous fishes The shared genetic code of all life on Earth […]

Which of the following equations best summarizes photosynthesis? A) 6 CO2 + 6 H2O + 6 O2 → C6H12O6 B) 6 CO2 + 6 H2O → C6H12O6 + 6 O2 C) 6 CO2 + 6 O2 → C6H12O6 + 6 […]

What name is given to the food-trapping cells of sponges? A) cnidocytes B) amoebocytes C) skeletal fibers D) choanocytes Why are most food chains limited to three to five trophic levels? A) The higher the trophic level, the larger the […]

The stomach’s gastric juice consists of ________. A) digestive enzymes only B) hydrochloric acid only C) digestive enzymes and hydrochloric acid only D) mucus, digestive enzymes, and hydrochloric acid What is the key to the recognition of codominance? A) The […]

Which of the following is a component of the fossil record? A) the distribution of murid rodents in Australia and Asia B) the similarity of the forelimbs of cats and bats C) molecular sequences D) bones of extinct whales Natalie […]

After replication, ________. A) each new DNA double helix consists of two old strands B) each new DNA double helix consists of one old strand and one new strand C) each new DNA double helix consists of two new strands […]