Which of the following could likely play a role in causing cancer?
1.Cells adhere too strongly to one another, causing a tumor to form.
2.Kinase enzymes add phosphates onto proteins that regulate the cell cycle.
3.The cell cycle skips interphase.
4.Checkpoint proteins make cells “commit suicide.”
3
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Plant cells often have a large membrane-bound sac that is used for storing water and other substances called a:
A. central vacuole. B. Golgi body. C. centriole. D. chloroplast. E. nucleus.
The cell-cycle phase that varies most in duration in various eukaryotic adult cell types is
A) M. B) G1. C) S. D) G2. E) G0.
Meiosis can occur
a. in all sexually reproducing organisms. b. only when an organism is diploid. c. only in multicellular organisms. d. only in haploid organisms. e. only in single-celled organisms.
At the time life arose on Earth, Earth's atmosphere contained all but which of the following?
a. H2 b. N2 c. O2 d. H2S