bio2101

Project Description:

question 31
if a woman is a carrier for the colorblind recessive allele and her husband is normal, what are their chances that a son will be colorblind?
question 31 options:

none since the father is normal.

50%, since the mother is only a carrier.

100% because the mother has the gene.

25% because the mother is a hybrid.

none since the son will also be just a carrier.

question 32
a mother is a carrier for blue eyes (autosomal recessive) and for hemophilia (x-linked recessive). which of these is a correct statement?
question 32 options:

all sons will have blue eyes and be hemophiliacs.

it depends on the father's genotype whether the sons will have blue eyes and/or be hemophiliacs.

the father's genotype can determine whether a son will have blue eyes but cannot determine whether a son will be a hemophiliac.

regardless of the father, no sons will have blue eyes or be hemophiliacs.

there is a linkage between eye color and hemophilia.

question 33
if the protein coat of a virus that infects a bacterium is labeled with radioactive sulfur and the dna of the virus is labeled with radioactive phosphorus, over time
question 33 options:

both the sulfur and the phosphorus will be found within the bacterium.

only the sulfur will be found inside the bacterium.

only the phosphorus will be found inside the bacterium.

both the sulfur and the phosphorus will be found outside the bacterium.

the radioactivity of the sulfur and phosphorus will decay very quickly and not be detectable.

question 34
the x-ray diffraction photography of rosalind franklin and maurice wilkins was critical evidence
question 34 options:

indicating that dna has a double helix structure.

showing the bases of dna were held together by hydrogen bonds.

showing equal numbers of purines and pyrimidines.

revealing the structure of the deoxyribose sugar.

of the location of each adenine, guanine, cytosine, and thymine.

question 35
in the watson-crick model of dna, the "sides" of the ladder are composed of
question 35 options:

sugars.

bases.

hydrogen bonds.

sugar-phosphate molecules.

phosphate groups.

question 36
the enzyme that is used to join complementary dna nucleotides together is
question 36 options:

dna polymerase.

rna polymerase.

helicase.

ribozyme.

lipase.

question 37
in semi-conservative dna replication, each new double helix formed will have
question 37 options:

two new strands and two old strands.

one new and one old strand in each helix.

three new strands in one helix and three old strands in the second helix.

two new and one old strand in one helix and two old and one new strand in second helix.

two new strands in one helix and two old strands in the other helix.

question 38
figure 25.1

in figure 25.1, if adenine is located on strand 4, then on strand 2 at the same location ____ must be present.
question 38 options:

adenine

thymine

cytosine

guanine

uracil

question 39
figure 25.1

in figure 25.1, when replication is finished, strand 1 and 2 will have the same base composition as
question 39 options:

strands 2 and 3.

strands 1 and 3.

strands 3 and 4.

strands 1 and 4.

strands 2 and 4.

question 40
the ______ contain(s) the information for the structure of the protein.
question 40 options:

introns

exons

promoter

ribosomes

nucleoli

question 41
messenger rna is produced in the
question 41 options:

cytoplasm.

ribosomes.

nucleus.

endoplasmic reticulum.

lysosome.

question 42
which is not true about the genetic code?
question 42 options:

it is exactly the same in all organisms.

it is composed of a triplet code of three bases per codon.

it produces 64 different possibilities of base sequences.

some amino acids are coded for by more than one codon.

it contains start and stop codons as instructions.

question 43
the correct sequence of events in the production of a polypeptide is
question 43 options:

initiation → termination → elongation.

elongation → termination → initiation.

termination → elongation → initiation.

elongation → initiation → termination.

initiation → elongation → termination.

question 44
apoptosis refers to cell death and
question 44 options:

is always biologically detrimental to an organism.

can be programmed and is essential to normal development.

is the accumulation of genetic errors.

is a failure in the translation or transcription mechanism.

is any failure of the genetic machinery to work correctly.

question 45
which of the following is not true about oncogenes?
question 45 options:

they are normal genes that have undergone a mutation.

they cause growth factors or growth factor receptors on a cell to malfunction.

proto-oncogenes are mutated copies of oncogenes.

they cause a cell to divide repeatedly.

they are not alien to the cell.
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