SCI 335 Week 2 Quiz 4

SCI 335 Week 2 Quiz 4 | Wilmington University

Question 1

Anabolic metabolism includes    

·         Substances that are synthesized.  

·         all processes needed to maintain life.  

·         destructive processes by which substances are decomposed.  

·         changes of larger molecules into smaller ones.

 

Question 2

A cofactor is defined as ______ and examples are ______.    

·         an inorganic molecule needed by some enzymes; cholesterol and calcium  

·         an inorganic molecule needed by some enzymes; vitamin B12 and B6  

·         a necessary part of some enzymes; copper, iron, and zinc  

·         a molecule that destabilizes substrates; carbonic acids

 

Question 3

Which of the following provides the best model to illustrate the way an enzyme interacts with another molecule?    

·         lock and key  

·         reflecting light beam  

·         rolling wheel  

·         bouncing ball

 

Question 4

When a sucrose molecule is decomposed to yield a glucose molecule and a fructose molecule,    

·         the process involves dehydration synthesis.  

·         a water molecule is released.    

·         a water molecule is used.  

·         None of these is correct.

 

Question 5

Three factors that increase the rates of enzyme-controlled reactions are the    

·         number of enzyme molecules, number of substrate molecules, and efficiency of the enzyme. 

·         temperature of the reaction, number of H2O molecules involved, and strength of bonds being formed.  

·         number of enzyme molecules formed, number of substrate molecules formed, and strength of the enzyme.  

 

Question 6

The oxidation that occurs during cellular respiration differs from burning in that respiration    

·         requires a relatively large amount of energy to start the process.  

·         utilizes enzymes to start the process.  

·         involves a greater release of energy in the forms of heat and light.  

·         None of these is correct.

 

Question 7

In the citric acid cycle,    

·         carbon dioxide is released.  

·         hydrogen atoms are released.  

·         2 ATPs are formed.  

·         All of these are correct.

 

Question 8

What is the function of ADP molecules in living cells?    

·         They form a genetic material important for reproduction.  

·         They act to "capture" energy from the oxidation of fuels to be used in other cell processes.  

·         They act as coenzymes so that fats can be synthesized.  

·         They are an integral part of the cell membrane, important in the transport of water molecules.

 

Question 9

An important mechanism by which metabolic pathways are controlled under physiological conditions is    

·         negative feedback.  

·         positive feedback.  

·         substrate concentration.

·         genetic control.

 

Question 10

The anaerobic phase of cellular respiration is called _______.

 

Question 11

Which of the following nucleotides occurs in RNA molecutes, but not in DNA molecules?    

·         cytosine 

·         thymine  

·         guanine  

·         uracil

 

Question 12

How many codons specify the twenty types of amino acids?    

·         61  

·         23  

·         46  

·         4

 

Question 13

Which of the following is not true regarding RNA?    

·         main location is in the cytoplasm  

·         contains ribose, a 5-carbon sugar  

·         double-stranded molecular structure  

·         has cytosine as an organic base

 

Question 14

The process of copying DNA information into the structure of an mRNA molecule is called which of the following?    

·         translation  

·         synthesis 

·         replication  

·         transcription

 

Question 15

Which of the following nucleotides occurs in DNA molecules, but not in RNA molecules?    

·         adenine  

·         thymine  

·         guanine  

·         cytosine