Question

how many pairs of nuclear chromosomes in each human cell?
a. 25
b. 46
c. 12
d. 23
e. 8
value: 10
adenine always binds to ___.
a. thymine
b. guanine
c. cytosine
d. tryptophan
e. lysine
value: 10
the enzyme that replicate dna
a. dna ligase
b. dna helicase
c. dna polymerase
d. dna gyrase
e. proteiase
f. trypsin

Explanation:

1. In human cells, there are 23 pairs of nuclear chromosomes. This is a fundamental biological fact.
2. In DNA, adenine (A) always base - pairs with thymine (T) through two hydrogen bonds.
3. DNA polymerase is the enzyme responsible for replicating DNA by adding nucleotides to the growing DNA strand.

Answer:

1. d. 23
2. a. Thymine
3. c. DNA Polymerase