SCI120 – Which of the following best defines

10 Jun SCI120 – Which of the following best defines

Question
1.Which of the following best defines nondisjunction?

A.Loss of a piece of a chromosome

B.Repetitive replications of the same piece of a chromosome

C.Complete exchange of chromosome pieces

D.Failure of chromosome pairs to separate

2.What amino acid does the codon ACU code for?

A.Alanine

B.Tryptophan

C.Leucine

D.Threonine

3.Which one of the following is a characteristic of cancer cells?

A.They have a specialized structure and function.

B.They’re usually either nerve cells or cardiac muscle cells.

C.They can’t travel to other parts of the body.

D.They result in uncontrolled growth.

4.Why are X-linked disorders more prevalent in men than women?

A.Because testosterone leads to the development of these traits.

B.Because men have two copies of the X chromosome.

C.Because these genes are found on the Y chromosome.

D.Because men have one copy of the X chromosome.

5.A woman who isn’t colorblind but has an allele for color blindness reproduces with a man who has normal vision. What is the chance that they’ll have a colorblind daughter?

A.0% B.25% C.50% D.100%

6.Which of the following processes occurs during meiosis and notmitosis?

A.Cytokinesis

B.Cytogenesis

C.Crossing-over

D.Crossing-under

7.The two types of cell cycle genes that, if mutated, cause cancer cells to divide uncontrollably are called tumor suppressor genes and

A.telomeres.

B.proto-oncogenes.

C.growth factors.

D.cancer genes.

8.From the cross Aa × Aa, the probability of producing a homozygous dominant offspring is A.50%.

B.75%.

C.25%.

D.100%.

9.One parent has curly hair, the other has straight hair, and their child has wavy hair. This is an example of

A.incomplete dominance.

B.codominance.

C.polygenic inheritance.

D.multiple allele traits.

10.In humans, what is the onlyhomologous chromosome pair that isn’t the same?

A.23 in females

B.14 in males

C.7 in females

D.23 in males

11.Which of these is trueof meiosis?

A.2n ? n

B.n ? n

C.n ? 2n

D.2n ? 2n

12.What holds the base pairs of DNA together?

A.Double helix

B.Covalent bonding

C.Hydrogen bonding

D.Ionic bonding

13.When you notice that someone has unusually blue eyes, you’ve noticed their

A.phenotype.

B.genotype.

C.allele.

D.hybridization.

14.If a piece of DNA breaks off from a chromosome and attaches itself to a nonhomologous chromosome at another location, what type of change has occurred?

A.Duplication

B.Translocation

C.Inversion

D.Deletion

15.If a cell has 18 chromosomes, how many chromosomes would each daughter cell have after mitosis? A.18

B.36

C.The number can’t be determined.

D.9

16._______ chromosomes are found in pairs, one from the father and mother.

A.Homologous

B.Chromatids

C.Nonsister

D.Haploid

17.Which of the following best defines genomics?

A.The study of the genomes of organisms

B.The study of cellular protein structures

C.A mechanism used in DNA fingerprinting

D.A sequence of mutant genes

18.Which one of the following strands of DNA is the complement strand to C-C-A-T-C-G?

A.A-A-C-G-A-T

B.T-T-G-C-T-A

C.G-G-T-A-G-C

D.G-G-A-T-G-C

19.Bacteria reproduce by

A.mitosis.

B.binary fission.

C.meiosis.

D.budding.

20.The phase of cell division in which chromosomes align on the spindle equator halfway between the spindle poles is

A.metaphase. B.prophase. C.telophase. D.anaphase