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

Biology & Microbiology

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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

Biology & Microbiology

HCG targets which reproductive structure?

a. corpus luteum b. placenta c. uterus d. ovary e. blastocyst

Biology & Microbiology

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.

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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.

Biology & Microbiology