Answer the following question given this paragraph: A wobble base pair is a non-Watson Crick base pairing between two nucleotides in RNA molecules. The four main wobble base pairs are guanine-uracil, inocine-uracil, inosine-adenine, and inosine-cytosine. Wobble base pairs are fundamental in RNA secondary structure and are critical for the proper translation of the genetic code. Inosine is a nucleoside that is formed from the hydrolytic deamination of adenine. Structurally, it resembles guanine, but lacks the 2-amino group. This lack of the 2-amino group allows inosine to form base pairs with uracil, cytosine and adenine, making it a particularly wobbly base. Q: Of the four main wobble base pairs, guanine is paired with what? Choices: - thymine - cytosine - adenine - uracil A:
uracil
Answer the following question given this paragraph: There are also six types of leptons, including electrons. Leptons have an electric charge of either -1 or 0. Electrons, for example, have a charge of -1. Leptons have mass, although the mass of electrons is extremely small. Q: How many types of leptons are there? Choices: - nine - two - twelve - six A:
six
Q: Answer the following question given this paragraph: The placenta develops throughout the embryonic period and during the first several weeks of the fetal period; placentation is complete by weeks 1416. As a fully developed organ, the placenta provides nutrition and excretion, respiration, and endocrine function (Table 28.1 and Figure 28.12). It receives blood from the fetus through the umbilical arteries. Capillaries in the chorionic villi filter fetal wastes out of the blood and return clean, oxygenated blood to the fetus through the umbilical vein. Nutrients and oxygen are transferred from maternal blood surrounding the villi through the capillaries and into the fetal bloodstream. Some substances move across the placenta by simple diffusion. Oxygen, carbon dioxide, and any other lipid-soluble substances take this route. Other substances move across by facilitated diffusion. This includes water-soluble glucose. The fetus has a high demand for amino acids and iron, and those substances are moved across the placenta by active transport. Maternal and fetal blood does not commingle because blood cells cannot move across the placenta. This separation prevents the mother's cytotoxic T cells from reaching and subsequently destroying the fetus, which bears "non-self" antigens. Further, it ensures the fetal red blood cells do not enter the mother's circulation and trigger antibody development (if they carry "non-self" antigens)at least until the final stages of pregnancy or birth. This is the reason that, even in the absence of preventive treatment, an Rh mother doesn't develop antibodies that could cause hemolytic disease in her first Rh+ fetus. Although blood cells are not exchanged, the chorionic villi provide ample surface area for the two-way exchange of substances between maternal and fetal blood. The rate of exchange increases throughout gestation as the villi become thinner and increasingly branched. The placenta is permeable to lipid-soluble fetotoxic substances: alcohol, nicotine, barbiturates, antibiotics, certain pathogens, and many other substances... Q: Capillaries in the chorionic villi filter fetal wastes out of the blood and return clean, oxygenated blood to the fetus through what? Choices: - separates vein - Back Vein - skin vein - umbilical vein A:
A: umbilical vein
Question: Answer the following question given this paragraph: Water-soluble carboxylic acids ionize slightly in water to form moderately acidic solutions. Q: Water-soluble carboxylic acids ionize slightly in water to form these? Choices: - solvents - nonacidic solutions - very acidic solutions - moderately acidic solutions A:
Answer: moderately acidic solutions
*Question*
Answer the following question given this paragraph: Compound machines generally have lower efficiency but greater mechanical advantage than simple machines. Q: What type of machines generally have lower efficiency but greater mechanical advantage? Choices: - calculation machines - simple machines - radical machines - compound machines A:
**Answer**
compound machines
(Question)
Answer the following question given this paragraph: Certain indicator compounds, such as litmus, can be used to detect acids. Acids turn blue litmus paper red. Q: Acids turn blue litmus paper which color? Choices: - grey - white - purple - red A:
(Answer)
red