Which of the following is the correct order of plant adaptations, from oldest adaptation to youngest adaptation?
A. Flowers, seeds, vascular tissue
B. Seeds, flowers, vascular tissue
C. Vascular tissue, flowers, seeds
D. Vascular tissue, seeds, flowers
Answer: D
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Ribosomes are very old structures, found in all organisms (except viruses), from bacteria to humans. As a result, molecular taxonomists are looking at relationships based upon which rRNA sequence(s)?
A) 16S B) 18S C) 30S D) both choices A and B E) all of the above
A researcher has a laboratory strain of flies that have loss-of-function mutations in both gene X and white. These flies are used as hosts for P element transformation: Embryos of the double mutant strain are injected with two plasmids, one containing a wild-type copy of the white gene (w+) and a wild-type copy of gene X, side-by-side within P element inverted repeats, and the other plasmid containing only the P element transposase gene. Transgenic offspring of the injected flies will
A) have both plasmids integrated randomly into the genome. B) have white eyes and express transposase. C) have red eyes and a wild-type copy of gene X integrated into a random location in the genome. D) have red eyes and a wild-type copy of gene X in place of the mutant copy in their genome.
If you eliminated all sources of calcium (dairy products, some vegetables) from your diet, the level of
which of the following would rise in an attempt to supply calcium stored in your body to the tissues that need it? a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. angiotensin
Which of the following statements about UV radiation is true?
a. It is necessary for the body to make vitamin B. b. The amount of UV radiation that reaches the Earth's surface is fairly constant. c. The ozone hole is responsible for the Greenhouse Effect, but has no impact on levels of UV radiation. d. Individuals with less melanin suffer less wrinkling and skin cancer. e. Exposure to ultraviolet rays causes the epidermis to thicken and produce more melanin.