Human Biology Exam Quiz!
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- 1.In a cell undergoing cellular reproduction which of the following stages have no chromatids?
- A.
Prophase
- B.
Anaphase
- C.
Metaphase
- D.
Telophase
- 2.Which portion of the meiotic cell division directly follows telophase and cytokinesis of the first cell division?
- A.
Replication of DNA
- B.
G2
- C.
S Phase
- D.
Prophase of the next division
- 3.If a cell is to undergo mitosis which of the following is not true?
- A.
Both members of a chromosome pair will be replicated.
- B.
Both members of a chromosome pair will attach to the spindle.
- C.
The mother cell will end up with four times the amount of DNA after Interphase has occurred.
- D.
There is only one Interphase in each cell reproductive cycle.
- 4.In cellular reproduction, if one sees the chromosomes of a cell aligned at the center of the cell in a straight line, this cell may:
- A.
Be considered a diploid cell.
- B.
Be in the G1 phase of cellular reproduction.
- C.
Be in either the G1 and G2 phases of cellular reproduction.
- D.
Have moved directly into anaphase from prophase.
- 5.The purpose of anaphase is to:
- A.
Eliminate one chromosome of each pair.
- B.
Cause the cell to grow before cytokinesis.
- C.
Allow separation of the chromatids of each chromosomes.
- D.
Make more DNA before telophase.
- 6.If one has the following sequence of bases, what will be the nucleotide base which one would predict to correctly replace the X? A A A G G G G C C C C T T T AT T T C C C C G G G G A A A X
- A.
C, because there cannot be four A's in a row.
- B.
It is not possible to predict what will occur at X.
- C.
U, because RNA is being produced.
- D.
T, because this is DNA.
- 7.If one has the following sequence of DNA bases, what will be the sequence of RNA which is made from this sequence? A A G C G T T G A C A
- A.
U U C G C A A C U G U
- B.
U U C G C U U C U G U
- C.
T T C G C U U C U G U
- D.
U U G C G U U C U G U
- 8.Which is true of the structure of DNA? [In the following, P = PHOSPHATE; S = THE CORRECT DNA 5 CARBON SUGAR]
- A.
Bonds between the P's of the two backbones hold the two DNA strands together.
- B.
Each sugar phosphate backbone (rails of the ladder) has the following structure: P - P - S - P - P - S - P - P - S - P - P - S - P - P
- C.
A nitrogenous base (A, C, G, or T) is attached to the S of the backbones.
- D.
Purines are found in only one strand of the DNA molecule because of the shape of purines.
- 9.In a normal piece of DNA which has 20 complementary nitrogenous base pairs, the highest number of purine nucleotides which could be found in one of the strands is:
- A.
6
- B.
8
- C.
10
- D.
20
- 10.In a molecule of DNA, one would find that:
- A.
Every purine is shaped as a single ring.
- B.
Every purine of one strand is hydrogen bonded to a pyrimidine of the other strand.
- C.
The two strands are held together by three hydrogen bonds between each of the bases of a base pair.
- D.
DNA is allowed to have purine-purine base pairs if they come next to a pyrimidine-pyrimidine base pair.
- 11.If a parent cell (assume 1 pair of chromosomes) is to undergo normal mitosis, then each of the daughter cells will have:
- A.
1 pair of chromosomes
- B.
1 chromosome
- C.
4 DNA molecules
- D.
2 chromatids
- 12.If a parent cell (assume 1 pair of chromosomes) is to undergo normal meiosis, then each of the final daughter cells will have:
- A.
1 pair of chromosomes
- B.
1 chromosome
- C.
2 DNA molecules
- D.
1 chromatid
- 13.If a parent cell (assume 1 pair of chromosomes) is to undergo normal meiosis and produces an egg, then the final, functional, unfertilized egg will contain:
- A.
1 pair of chromosomes
- B.
1 chromosome with 2 chromatids
- C.
1 chromosome
- D.
A small polar body instead of chromosome(s)
- 14.Which of the following is a characteristic of normal meiosis?
- A.
Meiosis produces only gametes.
- B.
Any body cell can undergo meiosis.
- C.
DNA undergoes replication twice, once before the first division and once before the second division.
- D.
After the first division, the two daughter cells are still diploid.
- 15.A human male has both an X and a Y sex chromosome. Therefore sperm formed by a human male:
- A.
Will contain both an X and a Y in the same sperm. Whichever chromosome is used from this type of sperm will determine the sex of the offspring.
- B.
May contain either an X or a Y but not both.
- C.
Contain only a Y because the sons will all get the Y.
- D.
Will become a polar body if it contains an X.
- 16.What is a codon?
- A.
A codon is three nitrogenous bases in a row of a DNA molecule.
- B.
A codon is three nitrogenous bases in a row at the end of a tRNA molecule.
- C.
A codon is three amino acids in a row in a protein.
- D.
A codon is three nitrogenous bases in a row of an RNA molecule.
- 17.Which codon is called the START codon?
- A.
The first nitrogenous base triplet AUG of an mRNA molecule.
- B.
The nitrogenous bases ABC.
- C.
The first exon in a mRNA molecule.
- D.
The first nitrogenous base A of an mRNA molecule.
- 18.What are introns?
- A.
Exons are really tRNA before the anti-codon is added.
- B.
Introns are the portions of RNA that are saved, or included, to form the final mRNA molecule.
- C.
An Intron is also called a codon. The two are the same thing.
- D.
Introns are the portion(s) of RNA that are removed, or excluded, from the final mRNA molecule.
- 19.Which is the true statement?
- A.
All codons code for an amino acid.
- B.
The first three amino acids. when synthesizing a protein, are always Methionine-glycine-glycine.
- C.
The first amino acid, when synthesizing a protein is always methionine.
- D.
An amino acid will have only one codon which codes for it.
- 20.If a human cell has 23 pair of chromosomes, one would say that it:
- A.
Will undergo meiosis.
- B.
Is a gamete in which non-disjunction of chromosome 23 has occurred.
- C.
Is probably from a woman.
- D.
Could be a fertilized egg.
- 21.Which of the following crosses would result in a phenotypic ratio of 1 dominant and 1 recessive?
- A.
AA x aa
- B.
Aa x AA
- C.
Aa x Aa
- D.
Aa x Aa
- 22.In the cross, AaBb x AaBb, which gamete would NOT be formed?
- A.
AA
- B.
Ab
- C.
AB
- D.
Ab
- 23.Which of the following crosses could produce a child with the type AB blood as well as a child with type O blood?
- A.
IAIB x ii
- B.
IAIa x IbIb
- C.
IAi x IBi
- D.
IAIB x IAIB
- 24.What proportion of homozygous genotypes could occur from the cross Aa x Aa?
- A.
1/4
- B.
2/4
- C.
3/4
- D.
9/16
- 25.The following genes R and r show incomplete dominance. Which of the following crosses would show three phenotypes?
- A.
RR x rr
- B.
RR x Rr
- C.
Rr x Rr
- D.
RR x RR x rr
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