A cell is observed under the microscope. What feature will indicate that it is in anaphase?
A) DNA is elongated, not condensed, and difficult to visualize.
B) Two separate nuclear membranes are visible.
C) Sister chromatids are separating.
D) Centrosomes are just beginning to separate and form the spindle.
Answer: C
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Oxygen is always required for the regeneration of NAD from NADH.
Answer the following statement true (T) or false (F)
Which of the following events involves the release of enzymes?
A. cell cleavage B. cortical reaction C. egg membrane depolarization D. increase in cytosolic calcium within the egg E. the fusion of egg and sperm nuclei
Why might it be easier to determine the bacterium that caused pneumonia than one that caused a wound infection?
A. There are very few microorganisms that can cause pneumonia, while there are many that can cause wound infections. B. Bacteria that cause pneumonia can be identified with few tests. Many bacteria are normally found on the skin and may be in the wound complicationg indentification of the pathogen. C. We have much better tests for bacteria in the lungs than we do in wounds. D. The techniques of 16S rRNA sequencing are easier to perform on a sample taken from the lungs than a sample taken from a wound.
Answer the following questions true (T) or false (F)
1. Haploid genomes contain two sets of chromosomes. 2. Fungi reproduce only asexually. 3. Protozoa are eukaryotic organisms that lack a cell wall and can be unicellular or multicellular.