What happens during pro-metaphase?
What will be an ideal response?
Ans: the nuclear envelope disappears and the chromosomes start to attach to the spindle
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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?
How is it that humans can perceive multiple sounds at once?
a. Each portion of the basilar membrane vibrates at a unique frequency, and multiple regions can be stimulated at the same time. b. The more frequencies of sounds that are present, the further the sound travels into the cochlea. c. We have two ears, each perceiving a subset of frequencies in the environment. d. The fluid in the middle ear can transmit multiple frequencies to the oval window. e. Sounds reaching the left or right ear result in different nerve impulses.
In an individual, an allele may be present and not express itself when
A. one allele is recessive and one allele is dominant. B. two recessive alleles are present. C. two dominant alleles are present. D. the individual is haploid.
The connection space between the dendrite of one cell and the axon of another cell is called a(n)
A. axonic connection. B. synapse. C. threshold. D. neurotransmitter.