WGU C190 Intro to Biology practice test questions

WGU C190 Intro to Biology practice test questions

• studiers today Leave the first rating

Students also studied Terms in this set (71) Western Governors UniversityBIO 5111 Save WGU C190 Intro to Biology 311 terms ellen_nicole_allen Preview C190 Pre-Assessment 70 terms Kelli_Sanchez3 Preview Bio WGU study for OA c190 329 terms sara_rastetter Preview WGU C Teacher lisa Practice questions for this set Learn1 / 7Study using Learn Another type of lipid that composes cells are called phospholipids. Phospholipids differ from other lipids because they Fats and oils are composed ofFatty acids and glycerol Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has .All single covalent bonds Choose an answer 1Contains only hydrophobic ends2Lacks any polar or ionic regions 3Composed entirely of carbon chains4 Contains a hydrophobic and hydrophilic end Don't know?

Triglycerides, a type of fat, are composed of what two subunits?Fatty acids and glycerol What would you have to do to make a fat from the fatty acid shown above?Attach it to a glycerol along with two other fatty acids.If one or more of the fatty acids in a triglyceride include omega-3 fatty acids, what can you predict about this substance at room temperature?It is a liquid oil What kinds of molecules are the major fuel for the salmon's long trip?Triglycerides (fats / oils) Based on your knowledge of the structure of triglycerides, what products would you expect to result from the complete hydrolysis of a fat molecule? More than one is correct.Fatty acids and glycerol The blubber layer helps insulate mammals and birds that live in cold water; fat does not conduct heat very quickly.Applying what you know about lipids, what is the main advantage of covering feathers or fur in oil?Oil sheds water and keeps underlying layers of fur or downy feathers dry.Another type of lipid that composes cells are called phospholipids. Phospholipids differ from other lipids because they Contains a hydrophobic and hydrophilic end Highly simplified diagram of a membrane's structure is made up of Phospholipids Which part of the molecules is hydrophilic?The heads Ions of salt (sodium, NA+, and chloride, Cl−) are highly hydrophilic. Will they easily pass through the layer to enter or leave a cell?No.What are molecules?Molecules are made of atoms

Below is an image of the smallest amino acid: Glycine.

What does each line in the picture of the amino acid represent?A shared pair of electrons in a covalent bond.A peptide is built so that the red amino acid is glutamic acid and the blue amino acid is lysine. How will these amino acids respond to each other?These amino acids are charged and will attract each other The amino acid chain of a protein is held together by Covalent bonds If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds would it use?Covalent bonds

If the protein needs to be flexible, with bonds that easily break and reform, which bonds would it use?Hydrogen Water molecules binding to each other is called a Cohesion Water molecules binding to other molecules is called Adhesion Water molecules form hydrogen bonds because water isPolar Water can bind to the walls of these cells because they are Polar When water binds to the walls of the cells, this is called an Adhesion Water molecules within these cells will also bind to each other. What is this called?Cohesion Dissolving sugar in water makes aSolution The sugar is theSolute The water is theSovent As water moves up the plant, it carries matter with it (such as nutrients and some hormones). What are these materials called?Solutes What characteristic of water allows this paperclip to float on the surface of the water?Surface tension Why does mercury (Hg) not travel as far up the capillary tube as water does?Mercury is not as adhesive as water If the plant gets too dry, the water column can break. This creates an air bubble in the xylem.What happens to the water when the air bubble forms?The water is still adhering to the xylem walls, but the water column is no longer continuous Explain why plants produce smaller cells during dry seasons?The smaller cells are more resistant to air bubbles Explain why plants produce larger cells during wet seasons?These cells can transport more water Which molecule is abundant in seeds and is easily digested to yield glucose?Starch Both starch and glucose have what primary function? Fuel / storage of energy

Hydrophobic moleculesDoes not interact with water Nonpolar molecules that lack highly electronegative atoms such as oxygen are Hydrophobic Ionic substances and polar molecules areHydrophilic Nonpolar molecules areHydrophobic is the most abundant organic molecule on planet Earth. It is a polysaccharide that is used as a structural material in the cell walls of plants.Cellulos Starch is an easily used starting point for fuel production.Why is it much harder to use cellulose for the same purpose?Cellulose is difficult to hydrolyze (digest) Cellulose is naturally found in many foods, and it is used as an added ingredient in many health food products.Why might cellulose be a "healthy" addition to bread or breakfast cereal?It slows the absorption of sugar from food into the blood Steroids are classified as lipids because they are hydrophilic?The carbon rings are hydrophobic due to the carbon to hydrogen bonds that are nonpolar.Steroids are composed of fatty acids like triglycerides and phosopholipids?Does not contain fatty acid Steroids are lipids that have unique structures. What description best describes steroids?Four fused carbon rings Cholesterol is a starting point for making vitamins A and

• What other important substance(s) are made by

modifying cholesterol? Select all that apply?Sex hormones; bile acids Trans fats are naturally occurring fatty acids?Made by man What units (monomers) make up a protein?Amino acids Which of the functions below is provided by collagen proteins?Provide structure in a cell or on a larger scale Which of the functions below is provided by p53 proteins?Produce, manage, repair, or regulate DNA in some way Cancer cells have faulty DNA and they divide rapidly in an uncontrolled manner. What would you predict about the effect of a mutation that destroys the function of p53?A loss-of-function mutation to p53 would contribute to cancer by removing a "brake" on cell division