input: OPTIONS:
- adaptation
- degradation
- radiation
- mutation Now, answer this question: Answer the following question given this paragraph: Mutations have many possible causes. Some mutations occur when a mistake is made during DNA replication or transcription. Other mutations occur because of environmental factors. Anything in the environment that causes a mutation is known as a mutagen . Examples of mutagens are shown in Figure below . They include ultraviolet rays in sunlight, chemicals in cigarette smoke, and certain viruses and bacteria. Q: What is it called when a mistake occurs in dna replication. A:
A:
output: mutation

Answer the following question given this paragraph: Leaves may vary in size, shape, and their arrangement on stems. Nonflowering vascular plants have three basic types of leaves: microphylls ("tiny leaves"), fronds , and needles . Figure below describes each type. Q: Nonflowering vascular plants have how many basic types of leaves? A:

OPTIONS:
- four
- one
- five
- three

Answer: three

Problem: OPTIONS:
- oxygen proteins
- function proteins
- nitrogen proteins
- receptor proteins
Q: Answer the following question given this paragraph: In eukaryotic cells, most of the intracellular proteins that are activated by a ligand binding to a receptor protein are enzymes. Receptor proteins are named after the type of enzyme that they interact with inside the cell. These enzymes include G proteins and protein kinases, likewise there are G-protein-linked receptors and tyrosine kinase receptors. A kinase is a protein involved in phosphorylation. Tyrosine kinase receptors bind many polypeptide growth factors, cytokines, and hormones. Once the ligand is bound, these receptors specifically phosphorylate tyrosine amino acids, activating the signal transduction process inside the cell. Q: What is named after the type of enzyme they interact with in the cell? A:
Answer: receptor proteins

Problem:OPTIONS:
- allergy
- cancer
- anemia
- immunodeficiency

Answer the following question given this paragraph: Immunodeficiency occurs when the immune system is not working properly. As a result, it cannot fight off pathogens that a normal immune system would be able to resist. Rarely, the problem is caused by a defective gene. More often, it is acquired during a person's lifetime. Immunodeficiency may occur for a variety of reasons:. Q: What occurs when the immune system is not working properly? A:
****
A: immunodeficiency

Answer the following question given this paragraph: Sometimes two air masses stop moving when they meet. These stalled air masses create a stationary front . Such a front may bring clouds and precipitation to the same area for many days. Q: What weather phenomenon, which may bring clouds and precipitation, is created by stalled air masses? A:
OPTIONS:
- susceptible front
- cool front
- Horizontal Front
- stationary front
stationary front

Answer the following question given this paragraph: Epithelial tissue is made up of layers of tightly packed cells that line the surfaces of the body. Examples of epithelial tissue include the skin, the lining of the mouth and nose, and the lining of the digestive system. Q: Tissue is made up of layers of tightly packed cells that line the surfaces of the body, such as skin. A:
OPTIONS:
- weak tissue
- neural tissue
- resultant tissue
- epithelial tissue

Answer:
epithelial tissue