Bio Midterm

Which of the following statements correctly identifies and describes the type of covalent bond found between oxygen and hydrogen in water molecules? A.) polar covalent bonds because hydrogen is more electronegative than oxygen B.)hydrogen bonds because hydrogen is more electronegative than oxygen C.) Polar covalent bonds because oxygen is more electronegative than hydrogen

polar covalent bonds because oxygen is more electromotive than hydrogen.

Explain why phospholipids spontaneously form bilayer when mixed with water? A.)Because they have one end that is polar and another that is nonpolar B.) Because the polar tails come together in the inside of the membrane C.) because the polar head groups come together

A.) Because they have one end that is polar an another that is nonpolar

Why are humans unable to digest cellulose?

A.) Cellulose is made of glucose molecules connected by B1 4 glycosidic linkages.

which of the following are found in eukaryotic cells but not prokaryotic cells? A.) A golgi body B.) DNA C.) Ribosomes

A.) Golgi body

The inside of a phospholipid bilayer is known as being: A.) Hydrophobic B.) Hypotonic C.)Hydrophilic

A.) Hydrophobic

Where is most of the DNA found in the cell A.) Nucleus B.) Mitochondria C.) Golgi

A.) Nucleus

Which of the following statements regarding photosynthesis and cellular respiration is true A.) Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria B.) Photosynthesis occurs in mitochondria and cellular respiration occurs in chloroplasts C.) photosynthesis occurs in mitochondria and in chloroplasts D.) Cellular respiration occurs in mitochondria and in chloropasts

A.) Photosynthesis occurs in choroplasts, and cellular occurs in mitochondria

Consider the following chemical equation which depicts the mechanism by which humans maintain an acid base balance in the blood. H+-HCO3+-H2CO3-H2O+CO2 What happens if the carbon dioxide on the right is not removed from the blood via the lungs? A.) The reaction will be driven toward the left, and the blood will become more basic. B.) The reaction will be driven toward the right, and more C02 will be moved via exhalation. C.) The reaction will be driven toward the center and the pH of the blood will remain the same

A.) The reaction WILL BE DRIVEN TOWARD THE LEFT, RESULTING IN THE BLOOD BECOMING MORE ACIDIC

Why do charged molecules have difficulty crossing a phospholipid bilayer? A.) They are too polar B.) They are too nonpolar

A.) They are too polar

How do cells capture the energy released by cellular respiration A.) They produce ATP B.) They produce glucose C.) They store it in molecules of carbon dioxide D..) The energy is coupled to oxygen

A.) They produce ATP

Describe why eukaryotic cells being compartmentalized can make their metabolism more complete? A.) Different chemical reactions can occur in isolation of each other B.) Different chemical reactions can occur together more frequently C.) Only compartmentalized cells perform complex processes such a photosynthesis

A.) different chemical reactions can occur in isolation of each other

A team of researchers is investigating a new carbon rich molecule important to life. They find evidence for the presence of both cis and TRANS isomers of the molecule in a mixture of near-pure molecules. Which of the following must be contained in the new molecule

A.) double bond

The processes of phoyosynthesis and cellular respiration are complimentary. During these energy conversion, some energy is A.) lost in the form of heat B.) used to create light C.) destroyed when the chemical bonds of glucose are made D.) Saved in the chemical bonds of water, CO2, and O2

A.) lost in the form of heat

A team of researchers is investigating a new carbon-rich molecule important to life. They find evidence for the presence of carbon-carbon double bond in the molecule. This observation means that the new molecule likely exists as which of the following? A) Hydrocarbon ring B.) Both cis and trans isomers

B.) Both cis and trans isomers

The study of DNA and inheritance is known as: A.) Physiology B.) Genetics

B.) Genetics

A biologist isolates a large unidentified molecule from some cells in his lab. What kind of reaction could he initiate to determine whether the molecule is a polymethus, a macro-molecule? A.) Condensation B.) Dehydraion C.) Hydrolysis

B.) Hydrolysis

What property of the phospholipid bilayer allows proteins to move laterally in the membrane? A.) Proteins attract each other which opposite charges. B.) Phospholipids molecules are not covalently bonded to each other C.) Phospholipids are attracted to each other by opposite charges

B.) Phospholipid molecules are not covalently bonded to each other

A kilocalorie is defined as A.) The quantity of glucose needed to increase the body temperature by 1 degree Celsius B.) The quantity of heat needed to raise the temperature of of 1kg of water by 1 degree celcius C.) The quantity of food used to maintain normal bodily functions. D.) The quantity of food consumes during a given type of evidence

B.) The quantity of heat needed to raise the temperature of of 1kg of water by 1 degree celcius

Consider the following chemical equation which depicts the mechanism by which humans maintain an acid-base balance in the blood H+ + HCO3- --H2CO3 -- H20 + CO2 A.) The reaction will be driven toward the left and will become more basic. B.) The reaction will be driven toward the right, and more CO2 will be removed via exhalation. C.) The reaction will be driven toward the center , and the pH of the blood will remain neutral

B.) The reaction will be driven toward the right, and more CO2 will be removed via exhalation.

Respiration__ and cellular respiration ____ A.) produces ATP, is gas exchange B.) is gas exchange; produces ATP C.) produces glucose; produces oxygen D.) uses glucose; produces glucose

B.) is gas exchange; produces ATP

Water molecules have one oxygen atom that is more electronegative than the two hydrogen atoms bound to it. As a result, which type of bonding holds water molecules together? A.) non polar covalent bonding B.)polar covalent bonding C.)ionic bonding

B.) polar covalent bonding

A disease called sickle cell anemia is caused by a change in a single amino acid residue in the hemoglobin protein, resulting in a distortion of the proteins shape at which levels? A.) primary and quaternary B.) primary and secondary C.) secondary and teriry

B.) primary and secondary

Which type of microscope can be used to view cellular organelles such as the endoplasmic reticulum and golgi? A.) light microscope B.) transmission electron microscope C.) scanning electron microscope

B.) transmission electron microscope

Which of the following products of cellular respiration? A.) Oxygen and carbon dioxide B.) Energy to make ATP and carbon dioxide C.) Oxygen and glucose D.) Oxygen and energy to make ATP

B.)Energy to make ATP and carbon dioxide

The label on the box of breakfast cereal lists one serving as containing "200 calories" per serving. How many sccientific calories are actually in one serving? A.) 20 B.) 2,000 C.) 200,000 D.) 2,000,000

C.) 200,000

Which of the following statements regarding cellular respiration is false? A.) Cellular respiration is a single chemical reaction with just one step B.) Cellular respiration produces water C.) Cellular respiration produces carbon dioxide D.) Cellular respiration releases heat

C.) Cellular respiration is a single chemical reaction with just one step.

What is the major component of the plant cell wall? A.) Starch B.) Glycogen C.) Cellulose

C.) Cellulose

A biologist isolates a large, unidentified molecule from some cells in his lab. He determines that macro-molecule breaks into smaller pieces with the concomitant loss of water. What reaction has he observed. A.) Hydrolysis B.) Condensation C.)Dehydration

C.) dehydration

Humans use calories they obtain from ___ as their source of energy

Food