A useful scientific hypothesis is one that is:
A) proven.
B) testable.
C) conclusive.
D) accurate.
E) abstract.
B) testable.
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Which of the following statements is incorrect concerning sister chromatids?
A. The formation of sister chromatids doubles the amount of DNA in a cell. B. Sister chromatids consist of two identical copies of a single homologue. C. Sister chromatids are held together at the centromere by kinetochore proteins. D. Sister chromatids are formed during the S phase of the cell cycle. E. Sister chromatids separate during telophase.
Answer the following statements true (T) or false (F)
1.Mycologists classify fungi into five phyla based on their sexual structures. 2.Ascomycetes are fungi that cause disease and are not beneficial to humans in any way. 3.A dikaryotic stage is common in the life cycle of many plants, protozoans, and fungi. 4.Salt and sugar in high enough concentrations retard mold growth by limiting the ability of these organisms to take up water by osmosis. 5.Some animals are autotrophs.
Nearsightedness is caused by a(n) _____
a. eye structure that focuses an image in front of the retina b. eye structure that focuses an image behind the retina c. eyeball that is too short d. recessive trait on the Y chromosome e. recessive trait on the X chromosome
Multigene families are
a) usually clustered at the telomeres. b) identical or similar genes that have evolved by gene duplication. c) groups of enhancers that control transcription. d) sets of genes that are coordinately controlled. e) equivalent to the operons of prokaryotes.