Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

22 Cards in this Set

  • Front
  • Back
All the elements in the Periodic Table are formed in the star. Briefly describe the steps in the process of creating these elements.
1. Stars obtain its energy by the fusion of hydrogen to form helium
2. As hydrogen is gradually exhausted, helium is fused to form carbon, oxygen, nitrogen, and other heavier elements
3. When iron is formed, the star has no more fuel to burn and begins to die
4. The dying star first collapses before turning into a super nova and explodes
5. The energy of the super nova breaks through the iron barrier to form the remaining elements in the periodic table
In 1978 the first "test tube" baby was born and since then, in virto fertilization (IVF) has become a mainstream procedure. Explain how IVF works in detail. Discuss 2 reasons why this procedure was so important.
A) First the female's ovaries are stimulated by hormones, which causes the release of multiple eggs. The eggs are then collected using an ultrasonic needle that pierces the vaginal wall. Each egg is then incubated in a Petri dish with growth media in a ratio of 1:75,000 sperm cells that have been collected from the male. Once fertilized the zygote begins to divide. In 3 days they become tiny embryos consisting of 6-9 cells and are ready to be transferred to the female's uterus.
B) It demonstrates how human life originates and provides an example of how nature can be manipulated by technology.
What is the general chemical composition of living organisms?
The primary elements that make up living organisms are hydrogen, oxygen and carbon, combining for 75 percent of all atoms. Other elements such as nitrogen, phosphorus and sulfur are also found in living organisms. These elemental concentrations vary from the compositions of both the Earth itself and from the compositions of the universe as a whole.
What is the evidence in support of the Big Band?
A first line of evidence came from Edwin Hubble who noticed that galazies are moving away from one another at very rapid speed. This would correspond with a small point of mass and energy exploding all of the matter is still moving away from that point. Einstein's E=mc2 also supports the theory. This equation allows for a very small point to contain huge amounts of mass and energy, which could be released in a Big Band like event.
Name three sources of organic material from space that have contributed to the building blocks of life on Earth.
Meteorites: The chemical compositions of some meteorites are rich in organic materials, including 70 different kinds of amino acids. This finding raised the possibility that during the heavy bombardment of the infant Earth, meteorites, comets, and asteroids played a significant role in filling the Earth's surface with the organic building blocks that are necessary for life.

Star Dust: In addition to large objects, Earth is showered with small specks of meteorites measuring less than 1mm wide. This idea suggests that the delivery of organic compounds from space has occurred throughout the entire history of the Earth. This material is a rich mixture of organic compounds.

Comets: The collision of meteorite impact with the Earth could elad to the formation of organic compounds. These collisions could produce amino acids and complex peptides, which when joined together form proteins.
The technique called ____ fertilization has been used for about 30 years to assist couples who have had difficulties in having children of their own.
The vitro fertilization is when the ___ is fertilized ouside of the _____.
egg, uterus
The _____ experiment was conducted by a graduate student in 1953 who demonstrated that the early Earth could have produced compounds, like amino acids, necessary for life.
The collisions of _____ with Earth have been shown to cause the formation of peptides, the chemicals which make up proteins.
Three basic characteristics of life include the abilities to ___, ___, and ___.
use energy, reproduce, evolve
The formation of _____, which surround all cells and act as a container for life, has been accomplished by scientists interested in the formation of early life on Earth.
Once all elements in the center of a star have been utilized for energy, the star reaches the _____ barrier.
In order for heavy elements to be produced, a star must _____, which generates tremendous heat allowing for the formation of many of the elements found in the universe.
A ___ can be made by stringing together the correct sequence of nucleoties together.
The 3 requirements of life include energy for growth and change, to _____ & _____.
reproduce, evolve
Stars are formed by the fusion of 3 _____ nuclei to produce carbon.
A star explosion, known as _____ _____, occurs when _____ cannot be further fused.
super nova, iron
All of the hydrogen, oxygen, carbon, nitrogen, calcium, and iron in our body come from _____ _____ that was released by stars upon their death.
star dust
Living organisms are composed of 49% _____, 24% _____ and 24% oxygen.
hydrogen, carbon
The theory that life arose on Earth from organic building blocks that were present in the water on Earth's surfce is known as the _____ hypothesis.
In her experiments, Jennifer Black demonstrated that the intense heat and pressures meteorites experience during entry into Earth's atmosphere actually causes amino acids in a meteorite to form _____.
Energy powers life through the inter-conversion of water and carbon dioxide to form _____.