BIOCHEMISTRY MODULE 1 EXAM
QUESTIONS WITH VERIFIED
CORRECT ANSWERS || ALREADY
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Four types of biomolecules - ANSWER carbohydrates, lipids, proteins, nucleic
acids
Mendel's Law of Independent Assortment and basis of the law - ANSWER
Mendel's law of independ...
Four types of biomolecules - ANSWER ✔ carbohydrates, lipids, proteins, nucleic
acids
Mendel's Law of Independent Assortment and basis of the law - ANSWER ✔
Mendel's law of independent assortment states that during meiosis, pairs of genes
on two different chromosome assort independently of each other in the formation
of gametes
A) genes occur in pairs and each allele is on each chromosome
B) Each chromosome separates from its partner into a different gamete during
meiosis (not true for closely linked genes on same chromosome)
Chi-square test - ANSWER ✔ Shows how well observed values fit expected
value. Probability that the difference between the observed value and the expected
value is due to chance and the likelihood that chance alone produced the variation
Genes contain the instructions for building proteins. Where are those instructions
located?
part
a. In the bonds between complementary bases.
b In the sugar and phosphate groups that are of each nucleotide.
c. In the tRNA.
d. In the nuclear membrane.
e. In the order of the DNA bases. - ANSWER ✔ In the order of the DNA bases
Human blood types are an example of codominance because:
,a) An individual with genotype AO will have A type blood
b) The only individuals with O type blood are homozygous recessive
c) Individuals with both A and B alleles produce a blended blood type with neither
allele expressing fully
d) The A and B alleles both express equally in individuals with both alleles. -
ANSWER ✔ d) The A and B alleles both express equally in individuals with both
alleles.
A woman who has blood type A has a daughter who is type O and a son who is
type B. Which of the following is a possible genotype for the son?
a) IBIB
b) ii
c) IBi
d) IBIA - ANSWER ✔ c) IBi
If a crossover event happened in one half of all tetrads, how many recombinant
gametes would be produced?
0%
50%
25%
12.5% - ANSWER ✔ 25%
The F1 offspring of Mendel's classic pea cross always looked like one of the two
parental varieties because:
a) different genes interacted to produce the parental phenotype
b) one allele was completely dominant over another
c) the traits blended together during fertilization
d) each allele affected phenotypic expression - ANSWER ✔ one allele was
completely dominant over another
A chromosome with a centromere at the very end is called:
submetacentric. metacentric.
acrocentric.
acentric.
telocentric. - ANSWER ✔ telocentric
Polygenic traits ______________________
,a. may be measured quantitatively and have continuous variation
b. are influenced by both genes and the environment
c. are not affected by the environment
d. fall into discrete classes of phenotypes
e. Both A and B - ANSWER ✔ may be measured quantitatively and have
continuous variation
AND
are influenced by both genes and the environment
Which of the following human genotypes is associated with Klinefelter syndrome?
XXY
XXYY
XXXY
all of the above
none of the above - ANSWER ✔ all of the above
Which of the following is not a component within a single nucleotide of a nucleic
acid?
nitrogenous base
sugar
polymerase
phosphate - ANSWER ✔ polymerase
Embryonic stem cells are the subject of a great deal of research. What
characteristic of embryonic stems cells accounts for this scientific interest?
they are not controversial
they are potentially totipotent
they are potentially pluripotent they can be used to clone animals they do not
undergo apoptosis - ANSWER ✔ they are potentially totipotent
The contribution of Gilbert and Sanger to modern genetics was to:
develop the PCR technique.
discover DNA in the nucleus of cells. describe the structure of DNA.
show that genes were made of DNA. develop a method for sequencing DNA. -
ANSWER ✔ develop a method for sequencing DNA
Which of the following statements about homologous chromosomes are true?
They always contain the same genes.
They always contain the same alleles.
, They occur together in diploid cells.
They occur together in haploid cells. - ANSWER ✔ they always contain the same
genes
they occur together in diploid cells
Your teaching assistant for class spent all night in the research lab on an
experiment, and in trying to review transcription and translation keeps
interchanging the words during his lecture. Which one(s) of these statements your
teaching assistant has made is true?
DNA is translated into RNA by RNA ploymerase.
mRNA is translated to a nucleotide sequence to make a protein. During translation,
amino acids are brought to the ribosome
by a tRNA molecule.
DNA is transcribed to RNA. None of the above. - ANSWER ✔ During translation,
amino acids are brought to the ribosome
by a tRNA molecule.
DNA is transcribed to RNA
Prokaryotic chromosomes do not have telomeres because:
they do not go through mitosis.
they do not go through DNA replication. they are in the cytoplasm.
they are circular.
they have no centromeres. - ANSWER ✔ they are circular
Mendel's law of independent assortment has its physical basis in the:
a. separation of alleles into haploid cells.
b. spindle attachment in anaphase I.
c. random arrangement of chromosomes on the metaphase plate in meiosis I.
d. sister chromatids separating in meiosis II. e. haploid cells forming. - ANSWER
✔ random arrangement on the metaphase plate in meoisis 1
What is the mechanism that ensures Mendel's First Law of segregation?
a. Segregation of sister chromatids during meiosis II b. The formation of the
kinetochore
c. Pairing of the dyads into tetrads
d. Formation of the chiasmata
e. Segregation of homologous chromosomes - ANSWER ✔ segregation of
homologous chromosomes
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