Biology

If a chromosome fragment breaks off and is lost from the original chromosome, the resulting chromosomal abnormality is called an) __________.

[removed] deletion
[removed] inversion
[removed] translocation
[removed] nondisjunction
[removed] reciprocal translocation

Question

9 of 45

If short hair L) is dominant to long hair l), animals LL and Ll have the same __________.

[removed] genotypes
[removed] phenotypes
[removed] alleles
[removed] genes
[removed] chromatids

Question

10 of 45

One of Mendel’s defining ideas was the theory of segregation. This idea __________.

[removed] deals with the alleles governing two different traits
[removed] applies only to linked genes
[removed] applies only to sex-linked genes
[removed] explains the behavior of a pair of alleles during meiosis
[removed] applies to the partitioning of proteins

Question

11 of 45

If short hair L) is dominant to long hair l), then what fraction of the offspring produced by a cross of Ll x ll will be homozygous dominant?

[removed] 1/2
[removed] 1/4
[removed] 1/3
[removed] 1/8
[removed] None

Question

12 of 45

If a child belonged to blood Type O, he or she could NOT have been produced by which set of parents?

[removed] Type A mother and Type B father
[removed] Type A mother and Type O father
[removed] Type AB mother and Type O father
[removed] Type O mother and Type O father
[removed] Type B mother and Type O father

Question

13 of 45

Amniocentesis involves sampling __________.

[removed] the fetus directly
[removed] the fetal cells floating in the amniotic fluid
[removed] sperm
[removed] blood cells
[removed] urine

Question

14 of 45

Which of the following genotypes is said to be homozygous?

[removed] AaBB
[removed] aaBB
[removed] aaBb
[removed] aABB
[removed] Aabb

Question

15 of 45

Which of the following is NOT a true statement about genes?

[removed] Genes are located on chromosomes.
[removed] Genes are inherited independently of the chromosomes.
[removed] Genes are arranged in linear sequence on chromosomes.
[removed] A gene is a discrete sequence of DNA on a chromosome.
[removed] Genes code for proteins.

Question

16 of 45

A karyotype __________.

[removed] compares one set of chromosomes to another
[removed] is a visual display of chromosomes arranged according to size
[removed] is a photograph of cells undergoing mitosis during anaphase
[removed] of a normal human cell shows 48 chromosomes
[removed] is a representation of a cell in apoptosis

Question

17 of 45

A woman heterozygous for colorblindness an X-linked recessive allele marries a man with normal color vision. What is the probability that their first child will be colorblind?

[removed] 25 percent
[removed] 50 percent
[removed] 75 percent
[removed] 100 percent
[removed] 0 percent

Question

18 of 45

What could the children of a colorblind woman and a man with normal vision be?

[removed] All will be colorblind.
[removed] None will be colorblind.
[removed] Daughters will be color-blind and sons will be of normal vision.
[removed] Sons will be colorblind and daughters will be of normal vision.
[removed] Half of the sons will be colorblind and all daughters will be colorblind.

Question

19 of 45

DNA replication __________.

[removed] occurs by the addition of nucleotides to the end of the DNA molecule
[removed] results in the formation of four new DNA strands
[removed] produces two daughter DNA molecules that are complementary to each other
[removed] uses each strand of a DNA molecule as a template for the creation of a new strand
[removed] begins when two DNA molecules join together to exchange segments

Question

20 of 45

If one strand of DNA is CGGTAC, the corresponding strand would be __________.

[removed] GCCTAG
[removed] CGGTAC
[removed] GCCAUC
[removed] TAACGT
[removed] GCCATG

Question

21 of 45

Which one of the following sequences best describes the flow of information when a gene directs the synthesis of a cellular component?

[removed] RNA ? DNA ? RNA ? protein
[removed] DNA ? RNA ? protein
[removed] protein ? RNA ? DNA
[removed] DNA ? amino acid ? RNA ? protein
[removed] DNA ? tRNA ? mRNA ? protein

Question

22 of 45

Which one of the following best describes the sequence of events of translation?

[removed] codon recognition ? translocation ? peptide bond formation ? termination
[removed] peptide bond formation ? codon recognition ? translocation ? termination
[removed] codon recognition ? peptide bond formation ? translocation ? termination
[removed] codon recognition ? peptide bond formation ? termination ? translocation
[removed] peptide bond formation ? translocation ? codon recognition ? termination

Question

23 of 45

In DNA, correct complementary base pairing would occur between __________.

[removed] cytosine and uracil
[removed] adenine and guanine
[removed] adenine and uracil
[removed] adenine and thymine
[removed] cytosine and adenine

Question

24 of 45

Which of the following is NOT true of DNA polymerase?

[removed] Adds new nucleotides to a developing strand.
[removed] Is an enzyme.
[removed] Creates the energy it needs by breaking adenine-guanine bonds.
[removed] Proofreads DNA strands to see that they are correct.
[removed] Is a protein.

Question

25 of 45

The movement of DNA fragments in a gel electrophoresis experiment is based on __________.

[removed] the amount of carbon in the fragment
[removed] the size and charge of the molecules
[removed] the number of organic rings in the fragment
[removed] their ease in going into a salt solution
[removed] the sugars in the fragment

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