U3 Test Biology

Which statement distinguishes the process of cytokinesis in plant and animal cells?

• Cytokinesis results in genetic diversity in plant cells but not animal cells.

• A cell plate forms in animal cells, while a furrow forms in plant cells.

• Cytokinesis results in genetic diversity in animal cells but not plant cells.

• A cell plate forms in plant cells, while a furrow forms in animal cells.

Which of the following is part of the spindle apparatus?

• centromere

• aster fibers

• nuclear envelope

• chromatin

How can apoptosis be defined?

• complete mitosis

• cell death

• incomplete mitosis

• cell growth

Why is adult stem cell research less controversial than embryonic stem cell research?

• Donated cadavers can be used to harvest adult stem cells.

• Consent can be obtained from adult stem cell donors.

• Stem cells from adults require no animal experimentation.

• Adult stem cell research has wider medical applications.

Which of the following is the number of chromosomes in a haploid cell?

• 1n

• 4n

• 2n

• 3n

Which event occurs during meiosis II but not during meiosis I?

(a)  

• haploid number of chromosomes line the equator
• spindle apparatus forms inside the cell
• cytokinesis occurs after the final phase
• sister chromatids are pulled to opposite poles

Why is Down syndrome called trisomy 21?

• The syndrome is caused by having 21 pairs of autosomes.

• The person has an abnormal gene on chromosome 21.

• The syndrome results from an extra chromosome 21.

• The person has 21 pairs of chromosomes instead of 23.

Which of the following describe Mitosis?

• The DNA of the resulting daughter cells are identi

• Cell growth and repair is completed.

• Two sets of cell divisions occur.

• Gametes are formed.

• Potential evolutionary changes can occur more frequently

Which of the following describe Meiosis?

• The DNA of the resulting daughter cells are identi

• Cell growth and repair is completed.

• Two sets of cell divisions occur.

• Gametes are formed.

• Potential evolutionary changes can occur more frequently

Match the following description to the correct stage of meiosis I. Answers may be used only once or not at all.

• telophase I

• Chromosome number is reduced from 2n to 1n.

• metaphase I

• Homologous chromosomes become visible, condense, and form pairs. Crossing over can occur.

• interphase

• Homologous pairs of chromosomes line up on the equator.

• anaphase I

• Two sister chromatids reach opposite poles of the cell.

• prophase I

• DNA is replicated and proteins are synthesized.