Project #88706 - biology questions

1) The information used to make proteins is encoded by the:

A) number of different chromosomes.

B) repeating sugar and phosphate molecules in DNA.

C) 20 different amino acids of proteins.

D) four bases A, T, G, or C.

 

2) Which molecule is made in the nucleus but exits to function in the cytoplasm with the ribosome to form a protein?

A) chromosome

B) protein

C) mRNA

D) gene

 

3) Which of the following is the proper sequence of events in gene expression?

A) protein → DNA → mRNA

B) mRNA → DNA → protein

C) DNA → protein → mRNA

D) DNA → mRNA → protein

 

4) At what point in the cell cycle does DNA replication take place?

A) during mitosis

B) continually throughout the cell cycle

C) during cytokinesis

D) before mitosis during interphase

 

5) What is a function of cell division?

A) to turn skin cells into hair cells

B) to repair and replace cells

C) to allow cell size to increase to its maximum

D) to allow mature leaves to increase in size

 

6) Which of the following is not paired correctly

A) prophase – chromosomes separate go to the poles

B) metaphase – chromosomes align in the middle.

C) anaphase – chromosomes separate and go to the poles

D) telophase – chromosomes are separated they formed two new nucleus and from cytokinesis two daughter cells will result

 

7) A liver cell from a human male has:

A) 22 pairs of autosomes (not sex chromosomes), an X chromosome, and a Y chromosome.

B) 22 pairs of autosomes and two X chromosomes.

C) 46 pairs of autosomes, an X chromosome, and a Y chromosome.

 

8) If a cell contains 20 chromosomes, how many chromatids will be present during prophase and metaphase?

A) 30

B) 20

C) 5

D) 40

 

9) What is correct about mitosis?

A) It goes from prophase, metaphase, anaphase to telophase

B) Its outcome is two daughter diploid cells

C) Its outcome is two daughter haploid cells

D) A nd B are correct

E) A and C are correct

 

 

10) What is correct about meiosis?

A) It does prophase, metaphase, anaphase to telophase twice

B) Its outcome is two daughter diploid cells

C) Its outcome is four daughter haploid cells

D) A nd B are correct

E) A and C are correct

 

 

1)  What is the term for an observable trait of an organism?

A) element

B) phenotype

C) hybrid

D) genotype

E) allele

 

2) A and a are dominant and recessive alleles, respectively, of the same gene. Which genotype(s) would result in an individual with the dominant phenotype?

A) AA and aa

B) Aa and aa

C) only AA

D) AA and Aa

E) only Aa

 

3) A and a are dominant and recessive alleles, respectively, of the same gene. Which genotype(s) would result in an individual with the recessive phenotype?

A) Aa and aa

B) AA and aa

C) Aa only

D) AA only

E) aa only

 

 

 

 

4) Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. Which of the following describes the genotypes of the parents?

A) One is homozygous dominant for the CF gene, and the other is heterozygous.

B) One is homozygous recessive for the CF gene, and the other is heterozygous.

C) They are both homozygous recessive for the CF gene.

D) They are both homozygous dominant for the CF gene.

E) They are both heterozygous for the CF gene.

 

5) Widow's-peak hairline in humans is dominant to non-widow's-peak hairline. If a person has a widow's-peak hairline, what is his or her genotype?

A) The genotype must be homozygous recessive.

B) The genotype is either homozygous dominant or homozygous recessive.

C) The genotype must be heterozygous.

D) The genotype is either heterozygous or homozygous dominant.

E) The genotype must be homozygous dominant.

 

6) Crossing two pink snapdragons yields some seeds that produce red-flowering plants, some seeds that produce white-flowering plants and some seeds that produce pink-flowering plants. If this trait operates by incomplete dominance and the allele R represents red flowers and the allele r represents white flowers, what genotype would a plant with pink flowers have for this trait?

A) RR

B) Rr

C) rr

D) RrRr

 

7) A person with the genotype IAI B has type AB blood. This is an example of:

A) the effect of the environment on phenotype.

B) dihybridness.

C) monohybridness.

D) codominance.

E) incomplete dominance.

 

8) A woman who is a carrier for the hemophilia gene has a child with a man who does not have hemophilia. Which prediction is correct?

A) All of the sons and none of the daughters will have hemophilia.

B) All of the daughters and none of the sons will have hemophilia.

C) Half of the sons and half of the daughters will have hemophilia.

D) Half of the sons and none of the daughters will have hemophilia.

E) Half of the daughters and none of the sons will have hemophilia.

 

9) What is a recessive disorder?

A) a genetic disorder with two functioning alleles

B) a genetic disorder that will express itself in the presence of one functioning allele

C) a genetic disorder that will express itself in the presence of two recessive alleles

D) a genetic disorder that involves change in chromosome number

E) a genetic disorder that involves change in chromosome structure

 

10) Why do X-linked conditions appear more frequently in males than in females?

A) A male with a nonfunctioning allele on the X chromosome does not have another allele of that gene on the Y chromosome that could cover up the nonfunctioning one.

B) Males have no X chromosomes.

C) The Y chromosome carries many alleles that are recessive to alleles on the X chromosome.

D) Males are more likely to inherit an extra chromosome than females.

E) Females have no X chromosomes.

 

11) An autosomal recessive disorder:

A) requires that only one parent be a carrier.

B) displays its symptoms only in heterozygotes.

C) is more frequent in males than females.

D) will appear only in children of parents who both carry the gene.

12) A person who has a recessive disorder but does not have the disorder him or herself is said to be a/an:

A) aneuploid.

B) aberration.

C) carrier.

D) hybrid.

 

13) What is nondisjunction?

A) failure of sperm and egg to fuse in fertilization

B) failure of cells to divide by cytokinesis in meiosis

C) failure of chromosomes to duplicate before mitosis or meiosis

D) failure of homologous chromosomes or sister chromatids to separate in meiosis

E) an extra duplication of the chromosomes before mitosis or meiosis

 

14) Down syndrome in humans is caused by:

 

A) an extra X chromosome.

B) an extra y chromosome.

C) three copies of chromosome 21.

D) three copies of chromosome 13.

E) a single copy of chromosome 21.

 

15) Explain in short answer what is deletion, duplication and inversion  in chromosomes aberrations

 

 

Subject Science
Due By (Pacific Time) 10/23/2015 1pm
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