Answer the following question given this paragraph: When a living thing responds to its environment, it is responding to a stimulus. A stimulus ( stimuli, plural ) is something in the environment that causes a reaction in an organism. The reaction a stimulus produces is called a response . Q: What is the term for something in the environment that causes a reaction in an organism? Choices: - pollution - crisis - climate - stimulus A:
stimulus
Answer the following question given this paragraph: The energy produced by a reactor fueled with enriched uranium results from the fission of uranium as well as from the fission of plutonium produced as the reactor operates. As discussed previously, the plutonium forms from the combination of neutrons and the uranium in the fuel. In any nuclear reactor, only about 0.1% of the mass of the fuel is converted into energy. The other 99.9% remains in the fuel rods as fission products and unused fuel. All of the fission products absorb neutrons, and after a period of several months to a few years, depending on the reactor, the fission products must be removed by changing the fuel rods. Otherwise, the concentration of these fission products would increase and absorb more neutrons until the reactor could no longer operate. Spent fuel rods contain a variety of products, consisting of unstable nuclei ranging in atomic number from 25 to 60, some transuranium elements, including plutonium and americium, and unreacted uranium isotopes. The unstable nuclei and the transuranium isotopes give the spent fuel a dangerously high level of radioactivity. The long-lived isotopes require thousands of years to decay to a safe level. The ultimate fate of the nuclear reactor as a significant source of energy in the United States probably rests on whether or not a politically and scientifically satisfactory technique for processing and storing the components of spent fuel rods can be developed. Q: How long do the long-lived isotopes require to decay to a safe level in a nuclear reactor? Choices: - tens of years - millions of years - hundreds of years - thousands of years A:
thousands of years
Q: Answer the following question given this paragraph: Bacterial infections of urinary organs, especially the urinary bladder, are common. They are called urinary tract infections. Generally, they can be cured with antibiotic drugs. However, if they aren't treated, they can lead to more serious infections and damage to the kidneys. Q: Antibiotic drugs are usually effective in treating what kind of infections? Choices: - viral - lethal - biological - bacterial A:
A: bacterial
Question: Answer the following question given this paragraph: Steroids (or sterols) have several functions. Sterols are a subgroup of steroids. The sterol cholesterol is an important part of cell membranes and plays other vital roles in the body. Cholesterol is a precursor to fat-soluble vitamins and steroid hormones. Steroid hormones include the male and female sex hormones. Sterols also have roles as second messengers in signalling pathways. Q: Sterols are a subgroup of what? Choices: - nuclides - nutrients - antibiotics - steroids A:
Answer: steroids
*Question*
Answer the following question given this paragraph: Only certain types of base pairing are allowed. For example, a certain purine can only pair with a certain pyrimidine. This means A can pair with T, and G can pair with C, as shown in Figure 3.33. This is known as the base complementary rule. In other words, the DNA strands are complementary to each other. If the sequence of one strand is AATTGGCC, the complementary strand would have the sequence TTAACCGG. During DNA replication, each strand is copied, resulting in a daughter DNA double helix containing one parental DNA strand and a newly synthesized strand. Q: A, t, g, and c pairs are associated with what substance that is important in genetics? Choices: - plasma - bacteria - blood - dna A:
**Answer**
dna
(Question)
Answer the following question given this paragraph: In the modern periodic table, each element is represented by its chemical symbol. The number above each symbol is its atomic number. Atomic numbers increase from left to right and from top to bottom in the table. Q: What is denoted by the number above the chemical symbol of each element in a modern periodic table? Choices: - metallic number - atomic weight - electron count - atomic number A:
(Answer)
atomic number