Which of the following statements about the cell cycle is false?
(a) Once a cell decides to enter the cell cycle, the time from start to finish is the same in all eukaryotic cells.
(b) An unfavorable environment can cause cells to arrest in G1.
(c) A cell has more DNA during G2 than it did in G1.
(d) The cleavage divisions that occur in an early embryo have short G1 and G2 phases.
(a)
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How can biodiversity affect the way we decontaminate industrial sites?
I) Bacteria have been found to be able to detoxify certain chemicals; perhaps there are more. II) Trees produce sawdust, which can be used to soak up chemicals. III) Species evolving in contaminated areas could adapt and detoxify the area. A) only I B) only II C) only III D) only II and III E) I, II, and III
A main function of most types of epithelial tissue is ________
A) sensation B) support C) covering surfaces D) absorption
An infection transmitted by a hypodermic needle is transmitted by __________.
A) indirect contact B) direct contact C) a vector D) common vehicle transmission E) droplet transmission
Which of the following contribute to an increased probability of a random match of a DNA profile in a population?
A) a random population with many relatives B) a population containing limited VNTR variation C) a population with inbreeding D) a population with a small number of identical twins