Biology 100 Test 2
- 1.True or False: All normal diploid cells in the human body have a complete set of DNA.
- A.
True
- B.
False
- 2.When a cell is not dividing, chromosomes are uncoiled into long, thin molecules of DNA and proteins called:
- A.
Chromatids
- B.
Chromatin
- C.
Chlorophyll
- D.
Genes
- E.
Enzymes
- 3.Which of the following statement is false ?
- A.
The genetic makeup of an organism constitutes its genotype.
- B.
An allele that is always fully expressed is referred to as recessive.
- C.
An organism with two different alleles for a single trait is said to be heterozygous for that trait
- D.
Alleles are alternative forms of a gene.
- E.
The expressed physical traits of an organism are called its phenotype.
- 4.The phase during meiosis when the sister chromatids separate and move to opposite sides of the cell is
- A.
Telophase I
- B.
Anaphase II
- C.
Prophase II
- D.
Metaphase I
- E.
Metaphase II
- 5.Which of the following statements about gene regulation is false?
- A.
It plays an important role in proper development.
- B.
Many cancers begin because of problems associated with gene regulation.
- C.
Although complex, researchers have an excellent understanding of gene regulation.
- D.
It is the process that controls gene expression.
- 6.The phase during mitosis when the chromosomes line up along the midline of the cell is
- A.
Telophase
- B.
Anaphase
- C.
Prophase
- D.
Metaphase
- 7.Which of the following occurs/occur during Interphase of the Cell Cycle? Choose the best answer
- A.
The cell grows
- B.
A copy of DNA is made (DNA duplicates)
- C.
The cell cytoplasm divides
- D.
All of the above are correct
- E.
A and B are correct, but not C
- 8.Which of the following terms refers to a change in the nucleotide sequence of DNA?
- A.
Translation
- B.
Non-disjunction
- C.
Pteiotropy
- D.
Mutation
- E.
Replication
- 9.The centromere is
- A.
A molecule necessary to make copies of a gene.
- B.
The point where sister chromatids are attached together.
- C.
A structure where proteins are assembled together.
- D.
An enzyme that unzips a DNA molecule.
- E.
None of the above.
- 10.Which of the following statements about single trait, multiple gene inheritance is false?
- A.
It occurs when many genes influence one characteristic.
- B.
It tends to affect males much more than females.
- C.
It produces phenotypes that tend to vary along a continuum.
- D.
It works when the effects of many genes add together to produce a particular phenotype.
- E.
It is also called polygenic inheritance.
- 11.Which of the following is NOT necessarily true of pairs of homologous chromosomes?
- A.
They separate from each other during Meiosis I.
- B.
They segregate independent of each other during gamete formation.
- C.
They carry the same alleles.
- D.
They carry the same genes.
- 12.Which of the following statements about promoter sequences and terminator sequences is false?
- A.
Proper reading of these sequences relies on molecules of tRNA.
- B.
Every gene is designated by these sequences.
- C.
They are nucleotide sequences that either start or stop transcription at that location on the molecule of DNA
- D.
They lie on either side of a coding sequence along a molecule of DNA.
- 13.How many sex chromosomes are in a human gamete?
- A.
4
- B.
3
- C.
2
- D.
1
- E.
0
- 14.Choose the proper pair of words to fill in the blanks in this statement: A codon consists of three _____, and codes for one ____.
- A.
Nucleotides...... protein
- B.
Nucteotides.... . .amino acid
- C.
Polypeptides.... . .amino acid
- D.
Amino acids...... protein
- 15.At the beginning of the mitosis, each chromosome of a eukaryotic cell consists of a pair of identical structures called:
- A.
Sister chromosomes
- B.
Sister chromatids
- C.
DNA transcripts
- D.
Nucleotides
- E.
Chromatin
- 16.Which of the following statements about cell division is false?
- A.
Cell division is how old or damaged cells are replaced.
- B.
Cell division is the process that enables organisms to grow.
- C.
Cell division only occurs in cells of that produce eggs and sperm.
- D.
Ell division is the process during which the DNA is copied and the cell is split into two daughter cells.
- 17.Which of the following statements about a gene is false?
- A.
It is a particular sequence of nucleotides found in a particular location along the molecule of DNA.
- B.
It can exist in alternative forms.
- C.
It contains the directions for the manufacture of a particular protein.
- D.
It is always expressed in the individual who has it.
- E.
It is copied during transcription.
- 18.The genetic information carried by a DNA molecule lies in
- A.
The sequence of the different nucleotides along the length of the molecule.
- B.
The sequence of amino^acids that run along its backbone.
- C.
He type of sugars it possesses.
- D.
The total number of nucleotides it contains.
- 19.The non-sex chromosomes are called
- A.
Chromatin
- B.
Chromatids
- C.
Autosomes
- D.
Gametes
- 20.Stem cells are
- A.
Useful for understanding the process of DNA replication.
- B.
A type of cell found only in plants.
- C.
Unspecialized, undifferentiated cells.
- D.
Important for directing natural selection.
- E.
None of the above
- 21.Egg and sperm cells are called
- A.
Clones.
- B.
Hybrids.
- C.
Gametes.
- D.
Somatic cells.
- E.
Stem cells.
- 22.Imagine that flower color in a rose species is controlled by a single gene. You mate a rose homozygous for red flowers with a rose homozygous for white flowers and get numerous offspring, all of which have pink flowers. This pattern of color expression is most likely to be an example of
- A.
Codominance
- B.
Polygenic inheritance
- C.
Crossing over
- D.
Incomplete dominance
- E.
Complete dominance
- 23.Given the nucfeotide sequence: ATAACCCGAT; which is the correct sequence of nucleotides needed to complete replication of a DNA molecule?
- A.
TUTTGGGCTU
- B.
ATAACCCGAT
- C.
CGCCAAATCG
- D.
TATTGGGCTA
- E.
UAUUGGGCUA
- 24.Use the information from the following paragraph to answer questions 24 and 25. A woman has been, unsuccessfully, trying to conceive for several years. At a fertility clinic, they discover that she has blocked fallopian tubes. Using modem technologies, some of her eggs are removed, fertilized with her husband's sperm, and implanted into her uterus. The procedure is successful, but the couple discovers that their new son is color-blind and has blood type O. The woman claims that the child can't be theirs since she has blood type A and her husband has type B. Also, neither parent is color-blind, although one grandparent (the woman's father) is also color-blind. As a genetic counselor, you would explain to the parents that :
- A.
The baby is theirs, since the blood types of parents have no relation to their children's blood types.
- B.
The eggs must have been accidentally switched, since the baby's blood type has to match one of his parents.
- C.
Each parent could have contributed one recessive allele, resulting in type O blood.
- D.
The eggs must have been accidentally switched, since a type A parent and a type B parent can have any type children except O.
- E.
It is possible for the baby to have type O blood, since type O is inherited through a dominant allele.
- 25.In regard to the baby's color blindness, you explain that
- A.
Color blindness often appears randomly, even if neither parent is color-blind.
- B.
Since color blindness is recessive, both parents can pass it on, even if neither is color-blind.
- C.
the baby's father must have a recessive allele for color blindness.
- D.
Since color blindness is sex-linked, a son can inherit color blindness if his mother carries the recessive color blindness allele.
- E.
The eggs must have been accidentally switched, since males inherit sex-linked traits only from their fathers.
Questions: 16 | Attempts: 78271 | Last updated: Mar 22, 2022
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Sample QuestionA Cell builds it's proteins from the Instructions encoded inits _________?
Questions: 15 | Attempts: 40363 | Last updated: Mar 22, 2022
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Sample QuestionA cell will swell up if ___________________________.
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