Which of the following statements is true?
A) Picking which type of media to use depends on how much money you willing to spend.
B) Scientists were not able to grow bacteria in the lab until the creation of the Petri dish.
C) Picking which type of media format to use depends only on the space available.
D) Agar is used as a solidifying agent for bacterial culture.
E) Media for bacterial growth only comes in a few varieties.
Answer: D
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After performing a Gram stain of a mixed culture of Gram-positive and Gram-negative cells, you
realize that you omitted the iodine step. What would you expect to see if you observed the slide under the microscope?
a. pink Gram-positive and purple Gram-negative cells b. purple Gram-positive and pink Gram-negative cells c. pink Gram-positive and pink Gram-negative cells d. colorless Gram-positive and pink Gram-negative cells e. colorless Gram-positive and colorless Gram-negative cells
Each of the following provides evidence that kinetochore microtubule shortening is directly involved in anaphase A chromosome movement to a pole except
A) Stabilization of microtubules with the drug paclitaxel stops chromosome movement to a pole. B) Treatment that accelerates microtubule depolymerization causes chromosomes to move toward the poles more quickly. C) Antibody inhibition of kinesin depolymerization of kinetochore microtubules interferes with chromosome movement to a pole. D) Laser bleaching of labeled kinetochore microtubules indicates they shorten at the kinetochore as the chromosome moves toward a pole. E) All of the above are evidence that kinetochore microtubule shortening is directly involved in anaphase A chromosome movement to a pole.
During mitosis and meiosis, many of the cellular processes are similar. What differences can be seen between prophase in mitosis and prophase I in meiosis?
A) During meiosis, but not mitosis, the homologous chromosomes pair together in tetrads. B) During meiosis, but not mitosis, the chromosomes are quadrupled prior to division. C) There are no differences between mitosis and meiosis at these stages. D) During mitosis, but not meiosis, the homologous chromosomes pair up
HIV attaches to T-cell and macrophages by means of an interaction between gp120 and a(n) (antibody/CD4/gp41) receptor.
Fill in the blank(s) with the appropriate word(s).