Timed AP Practice 2
You will have 15 minutes to do this quiz
Select your name from the list.
A common laboratory investigation involves putting a solution of starch and glucose into a dialysis bag and
suspending the bag in a beaker of water, as shown in the figure below.
The investigation is aimed at understanding how molecular size affects movement through a membrane.
Which of the following best represents the amount of starch, water, and glucose in the dialysis bag over the
course of the investigation?
The divergence between the two populations of Rhagoletis must have occurred very rapidly because
Prior to the European colonization of North Amerbca, the major host of Rhagoletis was a native species of hawthorn (a Berry of sorts), Crataegus marshallii. The domestic apple tree, Malus domestica, is not native to North America, but was imported by European settlers in the late 1700s and early 1800s.
When apple trees were first imported into North America, there was no evidence that Rhagoletis could use them as hosts. Apples set fruit earlier in the season and develop faster, where hawthorns set later and develop more slowly.
Recent analysis of Rhagoletis populations has shown that two distinct populations of flies have evolved from the original ancestral population of flies the other infests only hawthorns. The life cycles of both fly populations are coordinated with those of their host trees.
The flies of each population apparently can distinguish and select mates with similar host preferences and reject mates from the population specific to the other host tree. There is very little hybridization (only about 5 percent) between the two groups.
the apple tree was imported into North
America with European settlement approximately 200 years ago
flies were imported into North America with
European settlement approximately 200 years ago
long-distance rail transport of fruit increased
only after the American Civil War (18611865)
heavy use of gunpowder during the
American Civil War (18611865) led to
increased mutation rates in many natural populations of plants and animals
Initially, which of the following isolating mechanisms is likely to have been the most important in preventing gene flow between the two populations of Rhagoletis?
Reduced hybrid viability
Matings between individuals from the two populations of Rhagoletis produce hybrid flies that appear to be healthy and have normal life spans. The eggs laid by these hybrid flies, however, hatch less often than those of flies from either of the two populations. What isolating mechanism seems to be important in this hybrid population?
Reduced hybrid fertility
To determine the evolutionary history and relationships among organisms, scientists gather evidence from a wide variety of sources including paleontology, embryology, morphology, behavior, and molecular biology.
A phylogenetic tree of vertebrates is shown.
Which of the following statements is most consistent with the phylogenetic tree shown?
Birds and turtles evolved their own means of gas exchange independently of the other vertebrates.
Mammals are most closely related to birds because they share a direct common ancestor
The common ancestor of reptiles, birds, and mammals produced amniotic eggs.
Crocodiles are direct descendents of ray-finned fishes since they live in the same environment.
A student in a biology class crossed a male Drosophila melanogaster having a gray body and long wings with a female D. melanogaster having a black body and apterous wings. The following distribution of traits was observed in the offspring.
The alleles for gray body and long wings are dominant.
The alleles for gray body and long wings are recessive.
Genes for the two traits are located on two different chromosomes, and independent assortment occurred.
Genes for the two traits are located close together on the same chromosome, and some crossing over occurred between the two gene loci.
The diagram above depicts the response to a pinprick (stimulus) on the tip of a human finger. The arrows show the direction of impulse transmission along the labeled axons.
If axon II was damaged before the pinprick, which of the following is most likely?
The person will not feel the pinprick.
The person can no longer feel pain.
The person's finger will not withdraw reflexively.
The person cannot transmit nerve impulses to the brain.
If chemical signals in the cytoplasm control the progression of a cell to the M phase of the cell cycle, then fusion of a cell in G
with a cell in early M phase would most likely result in the
replication of chromosomes only in the G
exiting of both cells from the cell cycle and into the G
condensation of chromatin in preparation of nuclear division in both cells
transfer of organelles from the G
cell to the cell in the M phase
The healthy human immune system responds to pathogens with both specific and nonspecific processes. Which of the following models depicts a nonspecific response?
In the Arctic Ocean, the predominant primary
producers are phytoplankton. Phytoplankton
are consumed by zooplankton, which in turn are
eaten by codfish. In years when there is more
open water (less ice coverage), there are more
zooplankton and fish than in years with less open
water (more ice coverage). Based on the graph
above, the difference is most likely because
when there is less open water, light is blocked
from the zooplankton, so they cannot
produce as much food for the fish
when there is more open water, the
temperature is warmer, so the zooplankton
and fish populations increase in size
the ice blocks the light, so in years with more
ice coverage, there is less photosynthesis by
the ice increases the light available for
photosynthesis, so primary production
increases and zooplankton populations
increase in size
The figure above depicts the DNA-protein complex that is assembled at the transcriptional start site of gene X
when the expression of gene X is activated in liver cells. Previous studies have shown that gene X is never
expressed in nerve cells. Based on the diagram, which of the following most likely contributes to the specific
expression pattern of gene X ?
Expression of gene X produces large amounts of tRNA but undetectable amounts of mRNA.
The general transcription factors inhibit the activation of gene X in liver cells by blocking the activator from
binding to RNA polymerase II.
The activator is a sequence-specific DNA-binding protein that is present in some tissues but not in other
The enhancer is a unique DNA segment that is added to the nuclear DNA of some cells of an organism
during the process of mitotic cell division but not other cells.