You have in your possession a microscope slide with meiotic cells on it and a light microscope. What would you look for if you wanted to identify metaphase I cells on the slide?
A) a visible nuclear envelope
B) separated sister chromatids at each pole of the cell
C) tetrads lined up at the center of the cell
D) a synaptonemal complex
E) a cleavage furrow
Ans: C) tetrads lined up at the center of the cell
You might also like to view...
Isolates from cerebrospinal fluid (CSF) or respiratory tract specimens that are gram-negative coccobacilli grow on chocolate agar in CO2 but not on blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. Haemophilus parahaemolyticus. c. H. haemolyticus. d. H. influenzae.
All of the following are means of genetic recombination in prokaryotes EXCEPT
A. transformation. B. transduction. C. crossing over. D. conjugation.
Temperature is perhaps the most important factor in the distribution of organisms because
A. water is more scarce in warmer environments. B. wind amplifies the effect of cool temperatures. C. most organisms are unable to regulate their body temperature precisely. D. the metabolic optimum for endothermic animals is in temperate areas. E. many organisms are able to grow faster in warmer climates.
Place the steps in the correct order to reflect how a lethal dose may be determined.1. Dilutions of virus are made to represent a range of concentrations.2. Dilutions are inoculated into susceptible tissue cultures (or susceptible host organisms).3. Inoculated host cells are observed and the number of dead cells are counted.4. The dilution which killed 50% of the tissue culture cells is identified.
Fill in the blank(s) with the appropriate word(s).