Cyanobacteria live in aquatic environments and are photosynthetic. The aquatic environment is their ________ and their role as a primary producer is their ________.
A. host; function
B. habitat; purpose
C. habitat; niche
D. niche; habitat
Answer: B
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Conjugation is a process by which the bacterial cells
a. contact each other using a sex pilus to obtain new alleles. b. contact each other for gratification purposes. c. disrupt each other d. are infected with virus e. a bacteriophage carries DNA from one bacterium to another.
A zombie apocalypse wipes out almost the entire human species before the zombie threat is eliminated. Only a group of 100 people who were at a family reunion on an uninhabited island survived. They returned to the mainland completely unaware of what had happened to everyone. Answer the following question(s) regarding the few survivors who now begin to rebuild the human population.Despite an abundance of habitat, why will it be difficult for the human species to recover?
A. Related humans are not able to reproduce. B. The reduced genetic diversity will make it difficult for the population to adapt to new diseases or other environmental changes. C. Modern humans lack the ingenuity needed to survive without an extended social network. D. The founder effect will slowly kill off the survivors in a small population.
Which chemical is used to keep chromosomes from
separating during metaphase? a. Giemsa stain b. acetone c. colchicine d. alcohol e. formaldehyde
In ________ ________, cells are tagged with a fluorescent dye and injected into a flowing, progressively narrowing stream of fluid, forcing one cell at a time through a laser beam that scatters its fluorescence to a detector.
What will be an ideal response?