test

(noun)

the external calciferous shell of a foram

Related Terms

Examples of test in the following topics:

  • test

  • Male Hormones

    • FSH enters the testes, stimulating the Sertoli cells, which help to nourish the sperm cells that the testes produce, to begin facilitating spermatogenesis.
    • LH also enters the testes, stimulating the interstitial cells, called Leydig cells, to make and release testosterone into the testes and the blood.
    • Testosterone, the hormone responsible for the secondary sexual characteristics that develop in the male during adolescence, stimulates spermatogenesis, or the process of sperm production in the testes.
    • GnRH stimulates the production of FSH and LH, which act on the testes to begin spermatogenesis and to develop secondary sex characteristics in the male.
    • In turn, the testes production of testosterone and the hormone inhibin inhibit the release of GnRH, FSH, and LH in a negative feedback loop.

  • The Scientific Method

    • Recall that a hypothesis is an educated guess that can be tested.
    • To test the first hypothesis, the student would find out if drinking milk affects height.
    • To test the second hypothesis, the student could check whether or not his friend has tall parents.
    • Each hypothesis should be tested by carrying out appropriate experiments.
    • The student could then design an experiment with a control to test this hypothesis.

  • Biotechnology in Medicine

    • The process of testing for suspected genetic defects before administering treatment is called genetic diagnosis by genetic testing.
    • Depending on the inheritance patterns of a disease-causing gene, family members are advised to undergo genetic testing.
    • Treatment plans are based on the findings of genetic tests that determine the type of cancer.
    • Genetic testing involves the direct examination of the DNA molecule itself.
    • There are two major types of gene tests.

  • Pineal Gland and Gonads

    • They are the sex organs and include the male testes and female ovaries.
    • The testes produce androgens, which allow for the development of secondary sex characteristics and the production of sperm cells.
    • The testes produce androgens, such as testosterone, which regulate primary sex organ development and function, as well as the development of secondary sex characteristics and the production of sperm cells.
    • Male testes produce androgens, while female ovaries produce estrogen and progesterone.

  • Male Reproductive Anatomy

    • Primitive gonads become testes; other tissues produce a penis and scrotum in males.
    • The testes, a pair of male reproductive organs, produce sperm and male sex hormones, including the steroid testosterone.
    • In land mammals, the pair of testes must be suspended outside the body at about 2° C lower than body temperature to produce viable sperm.
    • Sperm develop in the seminiferous tubules that are coiled inside the testes .
    • This structure lies along the top and posterior portion of the testes; it is the site of sperm maturation.

  • The Punnett Square Approach for a Monohybrid Cross

    • Called the test cross , this technique is still used by plant and animal breeders.
    • In a test cross, the dominant-expressing organism is crossed with an organism that is homozygous recessive for the same characteristic.
    • The test cross further validates Mendel's postulate that pairs of unit factors segregate equally.
    • A test cross can be performed to determine whether an organism expressing a dominant trait is a homozygote or a heterozygote.

  • Scientific Reasoning

    • Science (from the Latin scientia, meaning "knowledge") can be defined as knowledge that covers general truths or the operation of general laws, especially when acquired and tested by the scientific method.
    • The steps of the scientific method will be examined in detail later, but one of the most important aspects of this method is the testing of hypotheses (testable statements) by means of repeatable experiments.
    • A theory is a tested and confirmed explanation for observations or phenomena that is supported by a large body of evidence.
    • These predictions have been written and tested, and many such predicted changes have been observed, such as the modification of arable areas for agriculture correlated with changes in the average temperatures.
    • Descriptive (or discovery) science, which is usually inductive, aims to observe, explore, and discover, while hypothesis-based science, which is usually deductive, begins with a specific question or problem and a potential answer or solution that can be tested.

  • Modern Applications of DNA

    • The acronym "DNA" has become synonymous with solving crimes, testing for paternity, identifying human remains, and genetic testing.
    • DNA testing can also be used to identify pathogens, identify biological remains in archaeological digs, trace disease outbreaks, and study human migration patterns.

  • Rhizaria

    • As a group, the forams exhibit porous shells, called tests, that are built from various organic materials and typically hardened with calcium carbonate.
    • The tests may house photosynthetic algae, which the forams can harvest for nutrition.