A cross between a male horse and a female donkey produces a mule. Mules are an example of
A. hybrid infertility.
B. gametic isolation.
C. zygote mortality.
D. temporal isolation.
Answer: A
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Which of the following is not true of X-inactivation?
A) It is necessary for dosage compensation. B) It is the cause of calico color in cats. C) The mechanism includes transcription of the XIST gene and chromatin remodeling. D) The XIST RNA is non-coding. E) The master regulatory gene for X-inactivation is sxl or sex-lethal.
Which structure of the eudicot embryo within a seed is NOT correctly identified?
(a). The radicle is the embryonic root (b). A cotyledon is a seed leaf. (c). The endosperm is the nutrient source for the embryo. (d). The epicotyl is the shoot above the attachment of the cotyledons. (e). The hypocotyl is the embryo plant below the attachment of the cotyledons.
The prokaryotes known as methanogens require ________ environments.
A. aerobic B. acidic C. high salt D. high temperature E. anaerobic
Bilateria are characterized by
A. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body. B. a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images. C. a plane of symmetry that forms mirror images around a vertical plane in the midline. D. a plane of symmetry that forms mirror images around an oblique plane in the midline. E. a plane of symmetry that forms mirror images around a horizontal plane in the midline.