Answer:
The main function of the pulmonary alveoli is to perform the transfer and exchange of gases. In this case, the following gases are included: oxygen, carbon dioxide and gases. Of the elements listed, the only one that is not transferred by the alveoli is the blood.
Explanation:
Answer:
1/64 = 0.015625
Explanation:
Genotype of parents: aa bb Cc Dd Ee x aa Bb Cc dd Ee
To calculate the frequency of the child with desired genotype, individual frequency of desired genotype can be calculated followed by application of product rule.
aa x aa = All aa
bb x Bb= 1/2 bb: 1/2 Bb
Cc x Cc= 1/4 CC: 1/2 Cc : 1/4 cc
Dd x dd = 1/2 Dd: 1/2 dd
Ee x Ee= 1/4 EE: 1/2 Ee: 1/4 ee
Expected frequency of the child with desired genotype= 1 aa x 1/2 bb x 1/4 cc x 1/2 dd x 1/4 ee = 1/2 x 1/4 x 1/2 x 1/4 = 1/64 = 0.015625
Answer:
If the sequence of one strand on DNA is CTA GCT CCA, the
complementary strand is GAT CGA GGT.
Explanation:
The DNA molecule has four nitrogenous bases in its structure, two purines —adenine and guanine— and two pyrimidines, cytosine and thymine.
The two DNA strands are linked by hydrogen bonds established between their complementary nitrogenous bases, where a purine is complemented by a pyrimidine.
In the case of DNA, adenine is complemented by thymine and cytosine is complemented by guanine:
<em>A=T</em>
<em>C≡G</em>
In the sequence belonging to a DNA strand CTA GCT CCA, the strand that is complementary would be GAT CGA GGT.
Answer: The reason is because DNA polymerase which is the enzyme that catalyzes the synthesis of DNA has a 3'->5' exonuclease activity that double-checks each nucleotide after it is added.
Explanation: The 3'->5' exonuclease activity of DNA polymerase allows the enzyme to double-check and remove a newly added wrong nucleotide. It is highly specific for mismatched base pairs. When the DNA polymerase adds a wrong nucleotide to the growing strand, translocation of the enzyme to the position where the next nucleotide is to be added is halted, but the exonuclease activity of the DNA polymerase removes the incorrectly paired nucleotide so that replication can continue. The process of double-checking a newly added nucleotide and removal of any incorrectly paired nucleotide by the DNA polymerase is called proofreading.
