Question

9) Which best describes the result of mitosis?
A) 4 haploid cells are created from one diploid cell.
B) 2 diploid cells are created from one diploid cell.  
C) 1 diploid cell results from fertilization of egg by sperm.
D) 1 haploid cell is created from one haploid cell.

10) Which of the following is NOT true about DNA?
A) Humans have 46 chromosomes in each somatic cell.   
B) DNA can be used to solve crimes and learn about our ancestry.
C) One of the main functions of DNA is to synthesize proteins.
D) DNA is made of amino acids.

11) _______________ are bases always bound together by ____________ bonds in DNA.
    A) adenine and thymine; hydrogen    B) adenine and guanine; hydrogen
    C) adenine and thymine; covalent        D) ribose and phosphate; hydrogen

12) Within the genetic code, there are multiple codons for a given amino acid. This property is called the _________________ of the code.
    A. universality        B. rare codon usage    C. specificity        D. degeneracy (redundancy)

Answer 1

9) B) Two diploid cells are created from one diploid cell.

In mitosis, one mother cell with diploid number of chromosome produce 2 daughter cells with same number of chromosome when enters in a cell cycle.

10) D)DNA is made of amino acids.

It is not true. DNA is made off nucleotides which contain one nitrogenous base, one deoxyribose sugar and one phosphate molecule.

11) A) Adenin and Thymine are bases always bounds together by hydrogen bonds in DNA.

Adenin always binds with Thymine by double hydrogen bonds, and Guanine always binds with cytosine by triple hydrogen bonds in DNA.

12) D) Degeneracy

The genetic code is degenerate. Some amino acids are encoded by more than one codon. There are possible 64 triplet codons for only 20 amino acids. Out of 64, 61 possible triplets specify particular amino acids and 3 triplets are stop codon.