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CBASE Science Practice Tests & Test Prep by Exam Edge - Features


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** Sample images, content may not apply to your exam **

Ready to start preparing for the CBASE Science exam? Start with an Exam Edge practice test. Our practice exams come with a variety of features to help you get the most out of your exam prep like:

  • Instant access to your online practice exams
  • Unlimited Test Access - available 24/7
  • Timed, untimed, and "study guide" modes
  • Detailed explanations for each question
  • 20 online practice exams
  • 820 unique questions, if you purchase all 20 exams
Read on and check out all the functions that make our CBASE Science practice tests a critical tool for your test prep.

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Features of Exam Edge CBASE Science Practice Tests

Our CBASE Science practice tests offer the following features to give you a comprehensive and customizable exam prep experience:


Accessible CBASE Science Practice Tests

  • Instant online practice tests: Because our practice exams are web-based, there is no need to wait for software to download or physical supplies to arrive in the mail. Once you purchase a bundle of practice tests, you can start using them immediately!
  • Unlimited test access: Our practice tests never expire. You can revisit each test as much as you would like in order to review the questions and answers.
  • Available 24/7: You can pause and resume our practice tests to suit your schedule, at any time of day. Start a practice test in the morning, pause it at noon, and pick it back up at midnight!
  • Access your test from any device: Our practice tests are available across multiple devices. As long as you have an internet connection, you can start a practice test on your desktop computer and continue it on your laptop, tablet, or smartphone for on-the-go flexibility.
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Realistic CBASE Science Practice Exam Questions

  • 41 multiple choice unique questions per exam: Each practice test is unique and matches the length of the real CBASE Science exam so you can practice time management and learn how to maintain focus for the duration of the test.
  • 20 online practice exams: Select our largest test bundle for the ultimate CBASE Science test prep package - 20 practice tests each test contains 41 unique questions that's 820 unique questions to make you incredibly ready for test day.

Helpful CBASE Science Study Guides

  • Detailed explanations for each question: Each CBASE Science practice test question comes with explanations for both correct and incorrect answers to help you understand and learn from your mistakes.
  • Repeated attempts on each practice test: You can take each unique practice test up to 4 times to strengthen your recall, hone your pacing, and build your test-taking stamina.

How CBASE Science Practice Tests Work

Our unique CBASE Science practice test environment is the closest thing you will find to the actual test, with one exception: we tell you which questions you answered correctly and which you answered incorrectly. And most importantly, we explain why! Our practice test questions give you step-by-step explanations in an easy-to-understand format. This opportunity to understand the practice exam questions and review your answers in depth will bolster your test prep and get you ready for success on test day.

** Sample images, content may not apply to your exam **

We also know that everyone likes to study differently, so we offer three different ways to use your CBASE Science practice exams:

  • Timed CBASE Science Practice Test Mode: Timed tests are just like the CBASE Science exam. Our system sets the test time to the same time limit, or time limit per question, that you will experience with the actual exam on test day. This is a great method of practicing your pacing, especially if you're concerned about completing your exam within the time limit.

  • Untimed CBASE Science Practice Test Mode: With this option, you can take your time and thoroughly consider each question before answering. This rush-free mode is recommended for those dipping their toes into exam prep or just starting on their journey to take the CBASE Science. It is a great way to test your knowledge with no time limit and highlight blind spots you will need to come back to in your studies - one of the many advantages of taking CBASE Science practice exams with Exam Edge!

  • CBASE Science Study Guide Mode: Not sure where to even begin with your studying? Try a practice test in explanation mode. The questions act as a study guide, giving you the option to see the answers as you take the test. Study guide mode is an effective way to review the CBASE Science exam subject matter before you take the exam in a timed format. We recommend taking a practice test in explanation mode and taking thorough notes as the best method for beginning your test prep.

Test Prep Beyond CBASE Science Practice Exam Questions

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Learn how to solve the entire test-taking puzzle with Exam Edge's CBASE Science practice tests! Such exams don't just measure what you know -- they are also a test of how well you perform under pressure. The right type of test preparation helps you familiarize yourself not only with the material you are being tested on but also the format of the test, to help you beat test-taking anxiety. That is the kind of valuable experience you will get with our practice tests and exam prep so you can walk into your exam as prepared as possible and feel ready to pass your CBASE Science exam.

CBASE Science - Features Sample Questions

A species was removed from a habitat. As a result, species richness was greatly reduced. This was most likely due to what?

Correct Answer:
the species was a keystone species.


when a species is removed from a habitat and the resulting effect is a significant reduction in species richness, the species in question is likely a keystone species. a keystone species plays a crucial role in maintaining the structure of an ecological community, influencing the types and numbers of various other species in the community. their presence is vital for the ecological balance and biodiversity of their habitats.

the concept of a keystone species was first developed by ecologist robert t. paine in 1969 following his experimental studies of the intertidal ecosystem. in his studies, paine removed the sea star pisaster ochraceus from its natural setting and observed a dramatic decrease in ecological diversity. specifically, the removal of this predatory sea star led to an increase in mussel population, which outcompeted many other species, thereby reducing overall species diversity.

keystone species can affect many ecological interactions and maintain the organization and stability of their communities. they can be predators, like the sea star, but they can also be plants that provide critical resources, or other organisms that have a unique role, such as pollinators or decomposers. the impact of their removal is much larger than would be expected based on their biomass or productivity alone.

in contrast, a strong competitor in an ecosystem typically reduces the species richness by outcompeting other species for resources, rather than maintaining it. resource allocation changes could affect species richness but would not typically have the dramatic effect seen with the loss of a keystone species. similarly, a potential parasite might impact host species negatively, but its removal would generally lead to increased health and possibly an increase in species richness of the affected hosts, rather than a decline.

thus, when a single species' removal leads to a significant decrease in species richness, it indicates that the species had a disproportionately large influence on maintaining the balance and diversity of its ecosystem, a hallmark characteristic of a keystone species.

A mutation that affects just one or a few nucleotides is called what?

Correct Answer:
point mutation.


a mutation that affects just one or a few nucleotides is called a point mutation. point mutations occur when the dna sequence is altered due to changes in a single nucleotide or a small number of nucleotides. these changes can have various consequences depending on their nature and location within the genome.

there are several types of point mutations, each characterized by the specific nature of the nucleotide change. one common type is the base-pair substitution, where one nucleotide is replaced by another. these substitutions can be further classified into transitions (where a purine is replaced with another purine, or a pyrimidine is replaced with another pyrimidine) and transversions (where a purine is replaced with a pyrimidine, or vice versa).

another type of point mutation includes insertions or deletions, often abbreviated as "indels". these mutations involve the addition or loss of nucleotides in a dna sequence. although technically they affect more than one nucleotide, they are still generally categorized under point mutations if only a few nucleotides are involved. insertions and deletions can lead to frameshift mutations if they do not occur in multiples of three nucleotides, since the genetic code is read in triplet codons during translation.

point mutations can also lead to missense or nonsense mutations. a missense mutation occurs when the change in nucleotide sequence results in the incorporation of a different amino acid in the protein being synthesized. this can affect the protein’s function, depending on the role of the substituted amino acid. on the other hand, a nonsense mutation results when a substitution creates a premature stop codon within the coding sequence, potentially leading to a truncated and usually nonfunctional protein.

the impact of point mutations can vary widely. some mutations may have minimal or no discernible effects on the organism, while others can lead to significant physiological changes or diseases. for example, the substitution mutation that causes sickle cell disease changes just one nucleotide in the hemoglobin gene, leading to a single amino acid change that significantly alters the hemoglobin protein’s properties and affects red blood cell function.

in summary, point mutations are changes to the genetic material at a very small scale but can have wide-ranging effects depending on their type and context within the genome. they are a key factor in genetic diversity and evolution, as well as in the etiology of various genetic disorders.
Digital Flashcards

Are you looking to boost your CBASE Science exam preparation? Add a pack of digital flashcards to your study routine. Flashcards offer a unique way to enhance your understanding of the material in several ways:

  • Enhanced Retention: Flashcards reinforce learning from practice tests through active recall and spaced repetition, which improves memory retention.
  • Flexibility: You can use them anytime, anywhere, when you have limited time, and when you cannot complete a practice test.
  • Immediate Feedback: Instant feedback on flashcards helps quickly identify and focus on improvement areas.

Using digital flashcards with practice tests offers you the best chance at passing your CBASE Science exam by improving your understanding and retention.

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