Q: Where in the cell does transcription occur? Read this paragraph and choose the correct option from the provided answers: Transcription is the DNA RNA part of the central dogma of molecular biology. It occurs in the nucleus. During transcription, a copy of mRNA is made that is complementary to a strand of DNA. In eukaryotes, mRNA may be modified before it leaves the nucleus. Choices: - protoplasm - epidermis - cell wall - nucleus A:
nucleus

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Q: Potential differences from various voltage sources are necessary in order to create electrical fields, which result in what flow of charge? Read this paragraph and choose the correct option from the provided answers: 20.2 Ohm's Law: Resistance and Simple Circuits What drives current? We can think of various devicessuch as batteries, generators, wall outlets, and so onwhich are necessary to maintain a current. All such devices create a potential difference and are loosely referred to as voltage sources. When a voltage source is connected to a conductor, it applies a potential difference V that creates an electric field. The electric field in turn exerts force on charges, causing current. Choices: - voltage - output - wattage - current A:
(Answer)
current

Ques: Q: What are chemical bonds between atoms of nonmetals that share valence electrons called? Read this paragraph and choose the correct option from the provided answers: Covalent bonds are chemical bonds between atoms of nonmetals that share valence electrons. In some covalent bonds, electrons are not shared equally between the two atoms. These are called polar covalent bonds. The Figure below shows the polar bonds in a water molecule (H 2 O). The oxygen atom attracts the shared electrons more strongly than the hydrogen atoms do because the nucleus of the oxygen atom has more positively charged protons. As a result, the oxygen atom becomes slightly negative in charge, and the hydrogen atoms become slightly positive in charge. For another example of polar bonds, see the video at this URL: http://www. youtube. com/watch?v=1lnjg81daBs. Choices: - electron bonds - ionic bonds - gravitational bonds - covalent bonds A:
Ans: covalent bonds

(Q).
Q: As roots grow longer they will always do what? Read this paragraph and choose the correct option from the provided answers: Roots have primary and secondary meristems for growth in length and width. As roots grow longer, they always grow down into the ground. Even if you turn a plant upside down, its roots will try to grow downward. How do roots "know" which way to grow? How can they tell down from up? Specialized cells in root caps are able to detect gravity. The cells direct meristem in the tips of roots to grow downward toward the center of Earth. This is generally adaptive for land plants. Can you explain why?. Choices: - change direction - get larger - get thicker - grow downward A:
(A).
grow downward

Ques:Q: In humans, each set of chromosomes contains 22 of these and 1 sex chromosome? Read this paragraph and choose the correct option from the provided answers: In humans, each set of chromosomes contains 22 autosomes and 1 sex chromosome . Autosomes are chromosomes that are not directly involved in determining the sex of an individual. The sex chromosomes contain genes that determine the sex of an individual. Choices: - centrosomes - chromatids - genes - autosomes A:

Ans:autosomes

Q: What happens to charges whenever they are accelerated? Read this paragraph and choose the correct option from the provided answers: Receiving Electromagnetic Waves Electromagnetic waves carry energy away from their source, similar to a sound wave carrying energy away from a standing wave on a guitar string. An antenna for receiving EM signals works in reverse. And like antennas that produce EM waves, receiver antennas are specially designed to resonate at particular frequencies. An incoming electromagnetic wave accelerates electrons in the antenna, setting up a standing wave. If the radio or TV is switched on, electrical components pick up and amplify the signal formed by the accelerating electrons. The signal is then converted to audio and/or video format. Sometimes big receiver dishes are used to focus the signal onto an antenna. In fact, charges radiate whenever they are accelerated. When designing circuits, we often assume that energy does not quickly escape AC circuits, and mostly this is true. A broadcast antenna is specially designed to enhance the rate of electromagnetic radiation, and shielding is necessary to keep the radiation close to zero. Some familiar phenomena are based on the production of electromagnetic waves by varying currents. Your microwave oven, for example, sends electromagnetic waves, called microwaves, from a concealed antenna that has an oscillating current imposed on it. Choices: - they fuse - they darken - they die - they radiate A:
they radiate