When was the largest extinction in Earth's history?
A) the current time
B) Cretaceous
C) Permian
D) Cambrian
C
You might also like to view...
How can two cells of a complex multicellular organism have the same genome, but markedly different structures and functions?
A. During differentiation, as cells become specialized, they lose portions of their genome that are no longer needed. B. Different genes are expressed in different cells. C. Part of the process of differentiation of cells involves mutations in the genome. D. Once differentiation begins, the genome no longer controls cellular functions.
In the testing of water for coliforms, the presumptive test involves detection of
A. sheen production on a selective medium. B. a gram-negative nonspore-forming rod. C. gas production in a lactose broth medium. D. All of these choices are correct.
Why did Dolly the sheep die at a young age?
What will be an ideal response?
Which of the following regarding Candida albicans is incorrect?
A) Candida albicans is a budding yeast that forms psuedohyphae when it invades tissue B) Candida albicans causes thrush C) Candida albicans is transmitted primarily by respiratory aerosol D) Impaired immunity is an important factor for the disease