The root-shoot axis of plants
A. is determined by the orientation of the first zygotic cell division.
B. is determined by sunlight, as roots grow away from the sun and shoot grow towards the sun.
C. is determined by three axes.
D. develops in segments.
E. None of these are correct.
A. is determined by the orientation of the first zygotic cell division.
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Specific amino acids are attached to tRNA molecules by
A. aminoacyl-tRNA synthetases. B. hydrogen bonds. C. anticodons. D. deactivating enzymes. E. initiation factors.
The U.S. Preventive Services Task Force recommended that women who are not at risk for breast cancer wait to have yearly screening mammograms until age 50, as opposed to the previous recommendation of age 40, because
A) breast tissue is more sensitive to radiation damage before menopause than after. B) the cost of the screening is not covered by insurance until after a woman reaches menopause. C) most forms of breast cancer do not develop until later in life. D) the method of screening is more accurate in older women than younger. E) delaying the screening ensures that younger, more at-risk women, are able to schedule the preventive tests.
Which of the following characteristics is (are) possessed in common by true mosses, ferns, and spike mosses, and therefore becomes useless at helping to determine to which of these groups "flower of stone" belongs?
1. a sporophyte generation that is dominant 2. true leaves and roots 3. flagellated sperm 4. strobili 5. alternation of generations A) 5 only B) 1 and 5 C) 2 and 3 D) 3 and 5
If someone has an upset stomach, such as traveler's diarrhea, and they ingest Lactobacillus acidophilus in order to treat the ailment, what is this type of therapy known as?
a. Chemotherapy b. Active bacteria therapy c. Antibiotic therapy d. Probiotic therapy e. Lactobacillus therapy