Order Cell Genome and Reproduction

Order Cell Genome and Reproduction
Order Cell Genome and Reproduction
1. A Gram positive obligate anaerobic organism, but which can survive in
the presence of molecular oxygen.
(A) The organism is Giardia lamblia that possesses the peroxidase gene.
(B) The organism is a common species of Clostridium.
(C) The organism is a normal morphological variant of Pfiesteria
(D) The organism is a mucoidal variation of Bacillus thuringensis.
2. A cell that can terminally differentiate into any of a number of final cell
(A) The cell expresses one of a number of variant-specific surface glycoproteins in sequence.
(B) The cell is a pluripotent stem cell.
(C) The cell has a mutation in one of its sigma factor genes.
(D) The cell has extensive histone methylation.
3. An organism that can express a significant glycoprotein capsule one day
but fails to produce it the next under identical environmental conditions.
(A) The organism was exposed to significant histone acetylation between
the two efforts that changed gene expression.
(B) The organism experienced a base substitution mutation in the promotor region of the capsule coding operon.
(C) The organism lost the capsule-encoding plasmid.
(D) None of the above.
4. A cell that disassembles its own nucleus and subdivides its cytosol and
organelles into smaller-sized membrane-bound nonfunctional subunits.
(A) The cell responded to a cytokine signal from a TCTL cell.
(B) The cell had a response to a bacterial exotoxin.
(C) The cell had a mutation with a homeotic gene.
(D) The cell was exposed to conditions that produce septic shock.
5. If you are observing mitosis during metaphase, which of the following
would be the correct sequence of structures if you are scanning from one
pole of the cell to the opposite pole?
(A) Centriole → spindle microtubules → kinetochore → centromere
→ kinetochore → spindle microtubules → centriole
(B) Centriole → kinetochore → spindle microtubules → centrosome
→ spindle microtubules → kinetochore → centriole
(C) Spindle microtubules → kinetochore → centriole → centromere
→ centriole kinetochore → spindle microtubules
(D) Centromere → kinetochore → spindle microtubules → telomere
→ spindle microtubules → kinetochore → centromere
(E) Telomere → centriole → spindle microtubules → centromere
→ kinetochore → centromere → spindle microtubules → centriole
→ telomere
Order Cell Genome and Reproduction
6. Interference in cell-to-cell signaling can be caused by
(A) closed gated transport.
(B) a defective sodium-potassium pump.
(C) antibody binding to surface proteins.
(D) a defect in a gene that codes for part of the cytoskeleton.
(E) increased cholesterol content of the cell membrane.
257. What is the relationship between a centromere and a kinetochore?
(A) A centromere is associated with cellular division, whereas a kinetochore
is not.
(B) A kinetochore attaches to the centromere during mitosis.
(C) Kinetochore proteins are phosphorylated to become centromere
(D) A kinetochore is associated with cellular division, whereas a centromere is not.
(E) Other than the fact that both are composed of proteins, there is no
258. Which of the following best describes a telomere?
(A) A single stretch of DNA that codes for all nucleic acid polymerases
(B) Regions of intensely staining proteins dispersed throughout chromosomes associated with active transcription
(C) Dispersed DNA sequences that code for most cytoskeletal proteins
associated with intracellular communications
(D) Repetitive sequences that are found on the ends of chromosomes
(E) A protein-based structure found in the cytoplasm associated with
controlling cellular division
259. The simplest complete summary for the formation of gametes is
(A) 2n → 4n → 2n.
(B) 1n → 2n → 4n.
(C) 1n → 2n → 4n → 2n → 1n.
(D) 2n → 4n → 2n → 1n.
(E) 2n → 1n.
260. Which of the following is required for chromosome movement in mitosis?
(A) Microfibril attachment to the nuclear membrane
(B) Microtubule attachment to spindle poles
(C) Myosin attachment at kinetochores
(D) Molecular motors attached to microtubules
(E) Histone attachment to telomeres
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