Studying the total amount of oxygen generated and released into the atmosphere by living things would be an example of studying ecology at which level?
A) ecosystem B) community C) population D) biosphere
Answer: D
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Antipodals and synergids are
A. produced in the female gametophyte. B. the result of double fertilization. C. what will fuse to form the endosperm. D. responsible for pollen tube formation. E. nonfunctional vestigal structures.
True-breeding red flowers are crossed with true-breeding white flowers, and all of the offspring are pink. What kind of inheritance is this?
a. codominance b. polyploidy c. incomplete dominance d. homozygous recessive
Potassium ions are important in the resting membrane potential and the action potential of the nerve and to the contraction of muscle cells. The concentration gradient of potassium ions is critical to both
An excess of potassium outside a neuron or muscle cell would negate the concentration gradient. What would happen if the heart were injected with massive amounts of potassium? Explain your answer.
The following segment of DNA is from a transcribed region of a chromosome. You know that RNA polymerase moves from left to right along this piece of DNA,
that the promoter for this gene is to the left of the DNA shown, and that this entire region of DNA is made into RNA. 5?-GGCATGGCAATATTGTAGTA-3? 3?-CCGTACCGTTATAACATCAT-5? Given this information, a student claims that the RNA produced from this DNA is: 3?-GGCATGGCAATATTGTAGTA-5? Give two reasons why this answer is incorrect.