Exam3A - BIO181 Exam 3 Fall 2008 1) What is a chromatid? A)...

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1 BIO181 Exam 3 – Fall 2008 1) What is a chromatid? A) a chromosome in G 1 of the cell cycle B) a replicate chromosome C) a chromosome found outside the nucleus D) a special region that holds two centromeres together E) another name for the chromosomes found in genetics 2) How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G 1 of the cell cycle? A) The daughter cells have half the amount of cytoplasm and half the amount of DNA. B) The daughter cells have half the number of chromosomes and half the amount of DNA. C) The daughter cells have the same number of chromosomes and half the amount of DNA. D) The daughter cells have the same number of chromosomes and the same amount of DNA. E) The daughter cells have the same number of chromosomes and twice the amount of DNA. Figure 12.2 3) If the cell whose nuclear material is shown in Figure 12.2 continues toward completion of mitosis, which of the following events would occur next? A) cell membrane synthesis B) spindle fiber formation C) nuclear envelope breakdown D) formation of telophase nuclei E) synthesis of chromatids 4) The somatic cells derived from a single - celled zygote divide by which process? A) meiosis B) mitosis C) replication D) cytokinesis alone E) binary fission
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2 5) Why do chromosomes coil during mitosis? A) to increase their potential energy B) to allow the chromosomes to move without becoming entangled and breaking C) to allow the chromosomes to fit within the nuclear envelope D) to allow the sister chromatids to remain attached E) to provide for the structure of the centromere 6) Cells that are in a nondividing state are in which phase? A) G 0 B) G 2 C) G 1 D) S E) M 7) This is the shortest part of the cell cycle: A) G 0 B) G 1 C) S D) G 2 E) M 8) DNA is replicated at this time of the cell cycle: A) G 0 B) G 1 C) S D) G 2 E) M 9) Which of the following is true of a species that has a chromosome number of 2n = 16? A) The species is diploid with 32 chromosomes per cell. B) The species has 16 sets of chromosomes per cell. C) Each cell has 8 homologous pairs. D) During the S phase of the cell cycle there will be 32 separate chromosomes. E) A gamete from this species has 4 chromosomes. 10) Which of these statements is false ? A) In humans, each of the 22 maternal autosomes has a homologous paternal chromosome. B) In humans, the 23rd pair, the sex chromosomes, determines whether the person is female (XX) or male (XY). C) Single, haploid ( n ) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2 n ), single - celled zygote. D) At sexual maturity, ovaries and testes produce diploid gametes by meiosis. E) Sexual life cycles differ with respect to the relative timing of meiosis and fertilization.
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3 11) In animals, meiosis results in gametes, and fertilization results in A) spores. B)
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Exam3A - BIO181 Exam 3 Fall 2008 1) What is a chromatid? A)...

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