Some cancer cells produce the enzyme ________, which protects the ends of chromosomes during multiple rounds of cell division
Fill in the blank with correct word.
Answer: telomerase
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Match each of the following cellular processes to the stage of meiosis in which it occurs. (Select all correct processes for each meiotic stage. Each cellular process may be used more than once.)
Stage Cellular processes prophase I a. Microtubules search for and attach to kinetochores at the centromere of each chromosome. metaphase I b. Microtubules from both sides of the spindle tether each chromosome and move them to the center of the cell. anaphase I c. Microtubules from both sides of the spindle tether each bivalent and move them to the center of the cell. telophase I d. Chromosomes condense to thickened structures that are visible under the microscope. prophase II e. The centromere divides and the sister chromatids separate. metaphase II f. The nuclear envelope reforms around the segregated chromosomes. anaphase II g. Two new chromosomes form from each original chromosome. telophase II h. The nuclear envelope disappears. i. Microtubules pull chromosomes toward opposite poles. j. The spindle assembles from tubulin dimers as the centrosomes migrate to opposite poles k. Chromosomes arrive at opposite poles of the cell. l. Chromosomes decondense. m. The spindle disappears. n. The bivalents separate and the homologous chromosomes move apart. What will be an ideal response?
What is the final step in a muscle contraction?
What will be an ideal response?
Following an endospore stain, how does one distinguish endospores from vegetative cells?
a. Vegetative cells are pink, endospores are green. b. Vegetative cells are pink, endospores are purple. c. Vegetative cells are purple, endospores are pink. d. Vegetative cells are green, endospores are pink.
Computer programs can scan DNA sequences and identify potential genes, which may or may not be functional genes. A functional gene must
a. share an exon with another functional gene. b. result in a mutant phenotype if its sequence is mutated. c. have an open reading frame. d. be expressed in all cell types of the organism. e. have a functional ortholog in another species.