Dosage compensation is accomplished in humans by inactivation of the Y chromosome
Indicate whether the statement is true or false
FALSE
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According to Chargaff's rule, if the DNA of a species contains 20% adenine, what percent of guanine will it contain?
A. 20% B. 30% C. 50% D. 75%
Four of the five regions listed below are all parts of a
sperm. Select the exception. a. flagellum b. midpiece c. acrosome d. polar body e. nucleus
Which statement is NOT true about photoperiodism?
A. A long-day plant will flower when the day length is longer than a critical length. B. A short-day plant flowers when the day length is shorter than a critical length. C. A day-neutral plant flowers according to some form of regulation other than photoperiodism. D. The phytochrome form Pfr is converted to Pr in daylight, producing the active form that induces flowering in long-day plants.
Which of the following is true about endospores?
A) Endospores are considered reproductive structures. B) Endospores are only viable for a short time. C) Endospores are highly resistant to environmental stress such as heat, drying, freezing, and radiation. D) Endospores are susceptible to various chemicals. E) Endospores are metabolically active structures.