Biology A 2021 - Unit 1 Exam Questions and Answers (2023/2024) Graded A

Biology A 2021 - Unit 1 Exam Questions and Answers (2023/2024) Graded A Two particles, a neutron and an electron, are to be added to this model. In what location should each be added? neutron: inside the nucleus electron: on the circle What element is the central part of all the different substances found in living things, such as carbohydrates and proteins? Carbon This element makes teeth strong. It is also needed for nerve function. calcium What is the space-filling model of this molecule? Which of the following is formed by an atom that has gained an electron? ion Which is true about water molecules? XXX Water molecules are polar, meaning they have a net partial negative charge. Read the passage. Oceans and seas can act as a heat reservoir to regulate climates. They can absorb great quantities of heat in the summer, with very little temperature change. In the winter, oceans and seas release the heat. This is the main reason why coastal climates are milder compared to inland climates. Which choice correctly explains this phenomenon? the high specific heat of water caused by hydrogen bonding How do biological systems respond when acids or bases are added? They have substances that counteract acids or bases to prevent the pH from changing Lipids and proteins can be formed from carbohydrates. Which elements do these molecules have in common that help form different molecules? carbon hydrogen oxygen What is the main role of the carbohydrate glycogen? It stores glucose in the body of animals. Which quality of lipids does it demonstrate? XXX ability to form chains of nucleotides (Might be 'ability to provide structural support') Is an omega-3 fatty acid a saturated or unsaturated fatty acid and why? Omega-3 fatty acids are unsaturated; they have a double bond at the 3rd carbon from the tail end of the molecule. Complete the following sentence. Antibodies are _ molecules, they function to _ in the body. Protein, identify foreign bodies like bacteria and viruses Proteins are made up of polypeptides. Polypeptides are chains made of what? amino acids Which of the following is a function of nucleic acids? transmitting genetic information