In four-o'clock plants, red flower color is dominant to white flower color. However, heterozygous plants have a pink color. If a pink-flowered plant is crossed with a white-flowered plant, what will be the phenotypic ratios of their offspring?
A. ¼ red, ½ pink, ¼ white
B. All pink
C. All white
D. ½ pink, ½ white
E. ½ red, ½ pink
D
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The bacterium Deinococcus radiodurans is able to withstand the damage incurred by exposure to very high levels of ? irradiation. This exposure introduces many double-stranded breaks that are repaired within hours
Which of the following is a key component of this rapid repair mechanism? A. RecA B. extended synthesis-dependent strand annealing (ESDSA) C. synthesis-dependent strand annealing (SDSA) D. double-strand break repair (DSBR) E. XerCD
HCG targets which reproductive structure?
a. corpus luteum b. placenta c. uterus d. ovary e. blastocyst
The ultimate source of all the food we eat and the oxygen we breathe is
A) cellular respiration. B) photosynthesis. C) glycolysis. D) anaerobic metabolism.
Each breath is initiated by neurons in the "respiratory control center" located in the
A. larynx. B. medulla oblongata. C. cerebellum. D. spinal cord. E. carotid body.