Biochemistry: Biochemistry 1 Homework Ch 1 Flashcards


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Biochemistry
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Answers to Biochem Homework, with small notes
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1

1) The synthesis of which molecule is considered by many to be the root of biochemistry since it was the first synthesis of a biological molecule from non-biological precursors?

A) DNA

B) urea

C) glucose

D) glycine

E) adenosine triphosphate (ATP)

B) urea

2

2)

Prior to 1926, the source of biological catalysis was postulated to be possessed by “ferments” which today are called _______.

A) proteins

B) nucleic acids

C) enzymes

D) polysaccharides

E) membranes

C) enzymes

But in 1926 James B. Summer showed that the protein urease, an enzyme from jack bean could be crystallized like any organic compound.

3

3)

Originally, nucleic acids were thought to serve what role within a cell?

A) catalysts

B) genetic

C) structural

D) buffer

E) none of the above

C) structural

Thought to be only fit for structural roles in the cells.

But it is now known that Nucleic acids are important because they make up genetic information in living things.

4

4)

Which of the following elements is considered a second tier biochemical element meaning that it is less abundant than first tier elements but still required for life in all organisms?

A) H

B) N

C) P

D) C

E) O

C) Phosphorus

Just like Calcium, Chlorine,Magnesium, Potassium, Sodium, Sulfur

All found in earth based living organism but on less abundance then first tier elements. First tier elements are Carbon, Hydrogen, Nitrogen, and Oxygen.

5

5)

Which of the following is a polymer derived from glucose?

A) cellulose

B) ribonucleic acid

C) polypeptide

D) deoxyribonucleic acid

E) none of the above

A) cellulose

polymer made by joining thousands of molecules of glucose(a simple sugar).

6

6) Which of the following macro-molecules is considered a homopolymer?

A)Polypeptides

B) Deoxyribonucleic acid

C) Ribonucleic acids

D) starch

E) all of the above

D) starch

B and C are made up of many different types of nucleic acids and so they are not homo polymers, meaning constructed from identical monomeric units. Polypeptide is a protein chain that consist f many amino acids together.

7

7)Which of the following is a role played by proteins?

A) structural

B) transport

C) information signaling

D) catalysts

E) all of the above

E) all of the above

There different types of proteins one which help in transport via transport proteins and other such as structural proteins that provide support in our bodies. Hormone protein which co-ordinate bodily function such as insulin control. “Cohesion proteins, which regulate chromosome structure during cell division, are also involved in making sure that genes are switched on or off at the correct times during development.”

8

8)

Of the following bio molecules, which is found only in a monomeric form as opposed to a polymeric form?

A) amino acids

B) carbohydrates

C) lipids

D) nucleotides

E) none of the above

B) carbohydrates

9

9)

What functional groups are found in the following molecule?

A) carboxylic acid, ether, amine and alcohol

B) carboxylic acid, ester, amine and alcohol

C) carboxylic acid, acetal, amine and alcohol

D) carboxylic acid, ether, amide and alcohol

E) carboxylic acid, hemiacetal, amine and alcohol

A) carboxylic acid, ether, amine and alcohol

10

10)

Of Koshland’s “pillars of life,” which deals specifically deal with the structure and function of DNA?

A) program

B) compartmentation

C) energy

D) regeneration

E) adaptability

A) program

organized plan for constitution and regeneration of an organism.

11

11)

Which of the following best describes homeostasis?

A) a non-equilibrium, non-steady state

B) a non-equilibrium steady state

C) an equilibrium-controlled, non-steady state

D) an equilibrium-controlled steady state

E) none of the above

B) a non-equilibrium steady state

12

12)The genetic information of viruses is contained within __________ .

A) DNA

B) DNA or RNA

C) specialized proteins with defined amino acid sequence

D) specialized carbohydrates with defined sequence

E) none of the above

B) DNA or RNA

or to be more specific in one molecule of nucleic acid( either dna or rna) wrapped made largely or completely of protein.

13

13) Which of the following represents the breaking of a noncovalent interaction?

A) hydrolysis of an ester

B) dissolving of salt crystals

C) ionization of water

D) decomposition of hydrogen peroxide

E) none of the above

B) dissolving of salt crystals

14

How are macro-molecules linked together?

polymerization

15

What is a covalent bond?

Where to elements share electrons in a bond.