Biology Test
1. Sister chromatids are attached to each other at an area called the:
a.)
b.)
c.)
d.)
Centriole
Centromere
Spindle
Chromosome
2. If a cell has 12 chromosmes, how many chromosomes will each of its daughter
cells have after mitosis:
a.)
b.)
c.)
d.)
4
6
12
24
3. At the beginning of cell division, a chromosome consists of two:
a.)
b.)
c.)
d.)
Centromeres
Centrioles
Chromatids
Spindles
4. The phase of mitosis during which chromosomes become visible and the
centrioles separate from one another is:
a.) Prophase
b.) Anaphase
c.) Metaphase
d.) Telophase
5. The timing of the cell cycle in eukaryotic cells is believed to be controlled by a
group of closely related proteins known as:
a.)
b.)
c.)
d.)
Chromatids
Cyclins
Centromeres
Centrioles
6. In the cell cycle, external regulators direct cells to:
a.)
b.)
c.)
d.)
Speed up or slow down the cell cycle
Remain unchanged
Proceed and then stop the cell cycle
Grow uncontrollably
7. Uncontrolled cell division occurs in:
a.)
b.)
c.)
d.)
Cancer
Mitosis
Cytokinesis
Cyclin
8. Different forms of a gene are called:
a.)
b.)
c.)
d.)
Hybrids
Dominant factors
Alleles
Recessive factors
9. If a homozygous tall pea plant and a homozygous short pea plant are crossed:
a.)
b.)
c.)
d.)
The recessive trait seems to disappear
The offspring are of medium height
No hybrids are produced
All the offspring are short
10. A Punnett square is used to determine the:
a.)
b.)
c.)
d.)
Probable outcome of a cross
Actual outcome of a cross
Result of mitosis
Result of meiosis
11. Organisms that have two identical alleles for a particular trait are said to be:
a.)
b.)
c.)
d.)
Hybrid
Heterozygous
Homozygous
Dominant
12. The physical characteristics of an organism are its:
a.)
b.)
c.)
d.)
Genetics
Heredity
Phenotype
Genotype
13. A situation in which a gene has more than two alleles is known as:
a.)
b.)
c.)
d.)
Complete dominance
Codominance
Polygenic dominance
Multiple alleles
14. Unlike mitosis, meiosis in male mammals results in the formation of:
a.)
b.)
c.)
d.)
One haploid cell
Three diploid polar bodies
Four diploid gamete cells
Four haploid gamete cells
15. To maintain the chromosome number of an organism, the gametes must:
a.)
b.)
c.)
d.)
Become diploid
Become recessive
Be produced by mitosis
Be produced by meiosis
16. A gene map shows:
a.)
b.)
c.)
d.)
The number of possible alleles for a gene
The relative locations of genes on a chromosome
Where chromosomes are in a cell
How crossing-over occurs
17. A nucleotide does NOT contain:
a.)
b.)
c.)
d.)
A 5-carbon sugar
Polymerase
A nitrogen base
A phosphate group
18. In prokaryotes, DNA molecules are located in the:
a.)
b.)
c.)
d.)
Nucleus
Ribosome
Cytoplasm
Histone
19. The main enzyme involved in linking individual nucleotides into DNA molecules
is:
a.)
b.)
c.)
d.)
Transfer RNA
Ribose
RNA polymerase
DNA polymerase
20. The process by which the genetic code of DNA is copied into a strand of RNA is
called:
a.)
b.)
c.)
d.)
Translation
Transcription
Transformation
Replication
21. In a messenger RNA, each codon specifies a particular:
a.)
b.)
c.)
d.)
Nucleotide
Purine
Amino acid
Pyrimidine
22. Changes in the DNA sequence that affect genetic information are known as:
a.) Replications
b.) Mutations
c.) Transformations
d.) Prokaryotes
23. A normal human diploid zygote contains:
a.)
b.)
c.)
d.)
23 chromosomes
46 chromosomes
44 chromosomes
XXY chromosomes
24. Most sex-linked genes are found on the:
a.)
b.)
c.)
d.)
Y chromosome
O chromosome
YY chromosome
X chromosome
25. Hemophilia is a genetic disorder that is:
a.)
b.)
c.)
d.)
Sex-linked
Sex-influenced
Fairly common
More common in women than men
26. Which parental pair could produce females with colorblindness:
a.)
b.)
c.)
d.)
Homozygous normal-vision mother, father with colorblindness
Mother with colorblindness, normal-vision father
Heterozygous normal-vision mother, normal-vision father
Heterozygous normal-vision mother, father with colorblindness
27. A common genetic disorder characterized by bent and twisted red blood cells is:
a.) Cystic fibrosis
b.) Hemophilia
c.) Sickle cell division
d.) Muscular dystrophy
28. Which of the following techniques takes advantage of repeated DNA sequences
that do not code for proteins:
a.) DNA fingerprinting
b.) DNA sequence
c.) Genetic engineering
d.) Rapid sequencing
29. The process of attempting to cure genetic disorders by placing copies of healthy
genes into cells that lack them is known as:
a.)
b.)
c.)
d.)
Gene therapy
DNA fingerprinting
Rapid sequencing
The Human Genome Project
30. Which of the following is NOT a phase of mitosis:
a.)
b.)
c.)
d.)
e.)
Anaphase
Metaphase
Telophase
Prophase
Interphase