Answer the following question given this paragraph: Arterioles An arteriole is a very small artery that leads to a capillary. Arterioles have the same three tunics as the larger vessels, but the thickness of each is greatly diminished. The critical endothelial lining of the tunica intima is intact. The tunica media is restricted to one or two smooth muscle cell layers in thickness. The tunica externa remains but is very thin (see Figure 20.4). With a lumen averaging 30 micrometers or less in diameter, arterioles are critical in slowing downor resistingblood flow and, thus, causing a substantial drop in blood pressure. Because of this, you may see them referred to as resistance vessels. The muscle fibers in arterioles are normally slightly contracted, causing arterioles to maintain a consistent muscle tonein this case referred to as vascular tonein a similar manner to the muscular tone of skeletal muscle. In reality, all blood vessels exhibit vascular tone due to the partial contraction of smooth muscle. The importance of the arterioles is that they will be the primary site of both resistance and regulation of blood pressure. The precise diameter of the lumen of an arteriole at any given moment is determined by neural and chemical controls, and vasoconstriction and vasodilation in the arterioles are the primary mechanisms for distribution of blood flow. Q: A very small artery that leads to a capillary is known as what? Choices: - capillary junction - vein - arterium - arteriole A:
arteriole
(Question)
Answer the following question given this paragraph: The only difference between each nucleotide is the identity of the base. There are only four possible bases that make up each DNA nucleotide: adenine (A), guanine (G), thymine (T), and cytosine (C). Q: There are only four possible bases that make up each dna nucleotide: adenine, guanine, thymine, and? Choices: - taurine - phenylalanine - guarine - cytosine A:
(Answer)
cytosine
Ques: Answer the following question given this paragraph: Forms of radiation that cause cancer include ultraviolet (UV) radiation and radon ( Figure below ). UV radiation is part of sunlight. It is the leading cause of skin cancer. Radon is a natural radioactive gas that seeps into buildings from the ground. It can cause lung cancer. Q: What is the leading cause of skin cancer? Choices: - artificial light - dehydration - smoking - sunlight A:
Ans: sunlight
(Q).
Answer the following question given this paragraph: Q: What is the change frogs and butterflies go through? Choices: - transformation - hiatus - parthenogenesis - metamorphosis A:
(A).
metamorphosis
Ques:Answer the following question given this paragraph: Types of mutagens include radiation, chemicals, and infectious agents. Q: Radiation, chemicals, and infectious agents are types of what? Choices: - mutations - endogenous - dioxins - mutagens A:

Ans:mutagens
Answer the following question given this paragraph: Delocalization of the electrons makes for a more stable molecule than a similar molecule that does not have delocalized electrons. Benzene is a more stable and less reactive compound than straight-chain hexenes. The sp 2 hybridization of the carbon atoms results in a planar molecule as opposed to the puckered structure of cyclohexane. Benzene rings are common in a great number of natural substances and biomolecules. The figure below shows the structural formulas for vanilla and naphthalene. Naphthalens is a chemical which is commonly used in mothballs. Q: Naphthalens is a chemical which is commonly used in what? Choices: - shampoo - fertilizers - inhalers - mothballs A:
mothballs