AP Bio Term 2 Exam
When copying polypeptides to DNA it is the opposite.
A= U T= A C= G G= C
True-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white terminal flowers. All F1 individuals have red axial flowers. If 1000 F2 offspring resulted from the cross of the F1s approximately how many of them would you expect to have red, terminal flowers. The genes for these traits are on separate chromosomes
About 188 plants
The endocrine system incorporates feedback mechanisms that maintain homeostasis. Which of the following demonstrates negative feedback by the endocrine system?
After a meal, blood glucose levels become elevated, stimulating pancreatic cells to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels.
In a mature forest of oak, maple, and hickory trees, a disease specific to oak trees causes a reduction in the number of acorns produced. Which of the following would least likely be a direct result of this? A.) Fewer squirrels have acorns as their primary food source. B.) Fewer mice and seed-eating birds due to squirrels resorting to seeds as a secondary source. C.) An increase in the number of hickory trees due to the decreased competition between hickory nuts and acorns for germination sites. D.) A decrease in the number of maple seeds due to the disease spreading to other trees in the forest.
D
Which of the following statements about the evolution of life histories is correct? A.) Stable environments with limited resources for r-selected populations B.) K-selected populations are most often found in environments where density-independent factors are important regulators of population size. C.) The reproductive efforts of r-selected populations are directed at producing just a few offspring during their lifetime D.) Density-independent events can cause several booms and busts in population size for r-selected populations
D
In dependent assortment of chromosomes is a result of...
The random way in which each pair of homologous chromosomes line up at the metaphase plate during meiosis 1
If a pharmaceutical company wished to design a drug to maintain low blood sugar levels, one approach might be to...
design a compound that inhibits cAMP production in liver cells
A scientist briefly exposes cells undergoing DNA replication to radioactively labeled nucleotides. When she centrifuges the DNA isolated from the cells, the DNA isolated from the cells, the DNA separates into two classes. One class of labeled DNA includes very long polymers of nucleotides and the other class includes short stretches of nucleotide polymers. These two classes represent...
leading strands and Okazaki fragments
Which way does DNA synthase?
the 5 to 3 way
During a field trip an instructor touched the body of a moth resting on a tree trunk. The moth raises its fore-wings to reveal large eye-spots on its hind wings. the instructor asked the class why the moth lifted its wings. One student answered that certain sensory receptors had fired and triggered a neural reflex culminating in the contraction of certain muscles. A second student responded that the behavior might frighten predators. Which of the following best describes the students explanations?
the first response answers a proximate, physiological question; the second response answers an ultimate, evolutionary question.
