A cell in prophase I of meiosis has ______________ as much DNA as each of the daughter cells following cytokinesis of meiosis II
A. twice
B. half
C. one-quarter
D. four times
D
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Parathyroid hormone (PTH) increases the
a. breakdown of bone. b. reabsorption of calcium. c. production of an enzyme that activates vitamin D. d. indirectly, helps intestines take up calcium from food. e. activities of all of these
Why is it unlikely that DNA was NOT the first
self-replicating molecule of life?
a. nitrogen is essential for constructing DNA and there was no nitrogen on early Earth b. DNA is hyper-sensitive to oxygen and would have disassembled quickly in its presence c. DNA requires proteins like DNA polymerase for assembly so it doesn’t truly “self-replicate” d. it must have RNA to self-replicate and RNA evolved much later in life’s history e. more than one of these is correct
Peacocks are males and peahens are females of a sexually dimorphic species. How could you test whether a peacock's tail was an important cue for peahen egg production?
A) Relate size of male tail to female tail. B) Remove tails from females and measure corresponding egg production. C) Remove tails from courting males and measure corresponding female egg production. D) All of the above answers apply. E) A and C are equally good answers
In 1822, the Canadian fur trader Alexis St. Martin was accidentally shot with a musket. The shot entered his left chest, fractured a rib, damaged the lungs, lacerated the diaphragm, perforated the stomach, and finally exited his body. Amazingly he survived, but the hole in his belly never completely healed. This allowed Dr. William Beaumont direct access to his stomach for experiments, and led to his discovery of the importance of stomach acid in digestion. Which body cavities did the musket shot pass through?
A. The shot entered the dorsal cavity and exited through the ventral cavity. B. The shot entered the pericardial cavity and exited through the pleural cavity. C. The shot entered the thoracic cavity and exited through the pleural cavity. D. The shot entered the thoracic cavity and exited through the abdominopelvic cavity.