Reference no: EM13584401
1. The mitotic spindle first appears during
A: prophase
B: metaphase
C: anaphase
D: telophase
2. Chromosomes line up in the center of the cell during
A: prophase
B: metaphase
C: anaphase
D: telophase
3. During mitosis, chromosomes begin to separate during
A: prophase
B: metaphase
C: anaphase
D: telophase
4. Which of the following is true regarding cytoplasmic division?
A: It occurs during the early part of mitosis
B: It is caused by microfilaments that lie beneath the plasma membrane
C: It begins during metaphasis
D: None of the above
5. Germ cells
A: in humans contain 46 chromosomes
B: are diploid
C: contain half the number of chromosomes of somatic cells
D: None of the above
6. Meiosis
A: occurs in all body cells
B: produces diploid gametes
C: involves two cell divisions
D: is identical to mitosis in all respects
7. Human somatic cells
A: contain 23 chromosomes from the mother and 23 from the father
B: are best described as haploid
C: undergo meiotic divisions
D: are genetically identical to germ cells
8. Meiosis I
A: is identical to mitosis
B: lacks a distinct metaphase
C: reduces the number of chromosomes in humans from 46 to 23
D: None of the above
9. In the ovary, the number of ova produced during meiosis is
A: one
B: two
C: three
D: four
10. The zygote produced during fertilization
A: divides my meiosis
B: is haploid
C: divides by mitosis
D: None of the above
11. The risk of a mistaken identity using DNA fingerprinting is _____ compared to a risk of error in blood typing of 1 in 1000
A: 1 in 4000
B: 1 in 4 million
C: 1 in 4 billion
D: 1 in 4 trillion
12. DNA
A: consists of two polynucleotide strands
B: is identical to RNA except that RNA consists of a single strand
C: contains two types of bases: purines and pyrimidines
D: a and b
E: a and c
13. A molecule that is not part of a nucleotide is
A: Phosphate
B: ribose
C: nitrogenous base
D: glucose
14. In DNA, hydrogen bonds are
A: nonexistent
B: found between the bases on opposing polynucleotide chains
C: found between sugars and phosphates
D: found between the nitrogen bases and sugar molecules
15. The DNA molecule contains
A: uracil
B: ribose
C: equal numbers of cytosine and thymine
D: contains equal numbers of purines and pyrimidines
16. Viruses
A: are submicroscopic organisms that lack organelles and can only reproduce inside other cells
B: are structurally very similar to eukaryotic cells
C: are considered living organisms
D: are not attacked by the immune system, which is why they are so dangerous
17. Bacteria
A: are eukaryotes that lack nuclei
B: are structurally identical to viruses
C: are prokaryotes that lack distinct organelles
D: cause disease
18. Which of the following is not part of the first line of defense against microorganisms?
A: The skin
B: The lining of the respiratory tract
C: The lining of the intestinal tract
D: The inflammatory response
19. During the inflammatory response
A: mast cells release histamine, causing the blood vessels to constrict
B: the release of prostaglandins at the site of the wound causes pain
C: blood flow to the injured area is reduced to prevent blood loss
D: all of the above
E: none of the above
20. Pyrogens
A: act on the temperature-regulating region of the hypothalamus, raising body temperature
B: are chemicals that lower body temperature, thus protecting the body in case of an invasion by bacteria
C: are one class of interferons
D: increase iron availability, which is detrimental to bacteria