Question 1 (1 point) A nucleotide contains which of the following functional gro
ID: 998813 • Letter: Q
Question
Question 1 (1 point)
A nucleotide contains which of the following functional groups?
a
sulfur
b
phosphate
c
carboxyl
d
halogen
Question 2 (1 point)
A peptide is a bond between which functional groups?
a
carbonyl and carbonyl
b
amino and alcohol
c
amino and carboxyl
d
carboxyl and alcohol
Question 4 (1 point)
Difference between amino acids are normally due to differences in which part of the molecule?
a
central carbon
b
carboxyl group
c
amino group
d
side chain
Question 5 (1 point)
What functional group is present in all carbohydrates?
a
carbonyl
b
amino
c
halogen
d
carboxyl
Question 6 (1 point)
A typical nucleotide is composed of _______.
a
base + sugar
b
base + phosphate
c
sugar + phosphate
d
base + phosphate + sugar
Question 8 (1 point)
Why do A and T (and G and C) pair in a DNA double helix?
a
Covalent bonds form between them.
b
Hydrogen bonds form between them.
c
Van der Waals forces are thus maximized.
d
Ionic interactions are thus maximized.
Question 9 (1 point)
Base pairing in DNA involves _____.
a
covalent bonds
b
ionic bonds
c
hydrogen bonds
d
acid-base reaction
a
sulfur
b
phosphate
c
carboxyl
d
halogen
Explanation / Answer
1) phosphate
A nucleotide is a compound consisting of a nucleoside (a compound commonly found in DNA) linked to a phosphate group. Nucleotides form the basic structural unit of nucleic acids such as DNA. A single nucleotide is composed of three functional groups: a sugar, a triphosphate, and a nitrogenous (nitrogen-containing) base.
2) . amino and carboxyl
A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amine group of the other molecule, thereby releasing a molecule of water (H2O). This is a dehydration synthesis reaction (also known as a condensation reaction), and usually occurs between amino acids. The resulting C(O)NH bond is called a peptide bond, and the resulting molecule is an amide. The four-atom functional group -C(=O)NH- is called a peptide link. Polypeptides and proteins are chains of amino acids held together by peptide bonds, as is the backbone of PNA.
4) It is the side group, also called the 'R' group. Everything else remains the same
5) carbonyl
carbohydrate contains aldehyde and ketone. Carbonyl are aldehyde's and ketone's.
6) base + phosphate + sugar
A nucleotide is composed of a 5-carbon sugar (either ribose or deoxyribose), at least one phosphate group, and a nitrogenous base.
7)Hydrogen bonds form between them.
Due to hydrogen bond they are covalently bonded
8) Hydrogen bond
DNA contains complementary base pairs in which adenine is always linked by two hydrogen bonds to thymine (AT). always linked by three hydrogen bonds to cytosine (GC).