What organ is part of the integumentary system?

Cyclins signal cells to progress through stages of cell replication. Uncontrolled production of cyclins will most likely result in...

Farmers spray pesticides on plants to protect plants from being eaten by insects. Some individual insects have a genetic mutation that makes them resistant to the pesticides. Which best describes how only a few resistant individuals resulted in the pesticide becoming ineffective?

What property is shared by cells of all living things?

Which organism gets the LEAST energy?

Which organism has the MOST energy?

Which best explains how the cell cycle is important to the life cycle of a frog?

What organs are part of the digestive system?

Which is part of the endocrine system?

When multiple transitional fossils are found in many rock layers, they provide evidence of...

A segment of DNA is shown. Which is the part labeled X?

What are genes?

A student conducted an investigation to study phototropism in grasses. The only difference between the control group and the experimental group was the light conditions. The control group was provided full light, while the experimental group was shaded on one side. The diagrams show the average heights and positions of blades of grass in the investigation. (View Image)

Which statement best explains why the grass tips of the experimental group bent toward the light?

The energy pyramid shows the energy made available by producers. (View Image)

Base on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the secondary consumer level in this pyramid?

Some students used vinegar to dissolve away the shells of three eggs and used the eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions. (View Image)

Which statement best describes the role of the cell membrane in this model?

The diagram shows cells in different phases of mitosis. A student is trying to find a cell in a particular phase of mitosis. The student is looking for evidence that spindle fibers are separating the chromosomes to ensure that each new nucleus has one copy of each chromosome. (View Image)

Which cell is in the phase of mitosis that the student is searching for?

The diagram represents one way an enzyme can be inhibited. (View Image)

Which statement explains the effect of an inhibitor on an enzyme?

A cladogram of five species is shown. Based on the diagram, the ancestral species most likely had -

Based on the information provided, which two species are most closely related? LOOK CAREFULLY

Based on the diagram, which two populations best represent trophic levels that RECIEVE the LEAST amount the total energy provided to the ecosystem by the grass?

When cells lose their ability to regulate the cell cycle, they divide at accelerated rate and form a mass of cells. This mass of cells is referred to as -

Based on the diagram, which set of bat species is the least related?

How do the wings of the Gentoo penguin and the legs of the common ostrich provide an advantage in their habitat?

Overfishing is causing the decline of fish populations, such as Eastern Atlantic bluefin tuna in the Mediterranean. Eastern Atlantic bluefin tuna are caught faster than they can reproduce. Which statement describes the most likely effect that overfishing will have on this ecosystem?

The aye-aye lemur is mammal that feeds mostly on insect larvae that live inside trees. When it hears a difference in the echo, it tear open the bark with its teeth until the insect tunnel is exposed. It uses its specialized finger to reach the insect larvae and remove it. Which selective pressure most likely resulted in the the aye-aye lemur's special adaptation?

Conservation biologists studying cheetah populations have determined that the lack of genetic diversity among the cheetahs is due to genetic drift. Which statement explains the most likely consequence of having a low genetic diversity on the cheetah population?

The life cycle of a frog is illustrated in the diagram.

Which statement best explains how the cell cycle is important to the life cycle of the frog?

When the skin comes in contact with an irritant, receptors in the skin send signals to the spinal cord. The signal is then sent to the brain for processing, and the individual begins to scratch the affected area. Which two systems are most likely interacting when a person experiences itching caused by a skin irritant?

An illustration of how a particular DNA mutation will most likely affect the polypeptide produced is shown. What type of mutation is illustrated?

In Texas Longhorn cattle, coat coloration is an inherited trait. What is the genetic basis of coat-color variation in Texas Longhorn cattle?

8 A cellular process is shown. Which statement best describes the significance of this process?

The giant octopus lays 20,000 to 100,000 fertilized eggs. After hatching, most octopuses become prey to larger marine organisms, and less than 5% will reach adulthood to reproduce. One benefit of the giant octopus laying many eggs is to —

Which of these correctly compliments the following DNA strand during replication: AGGTCA

In which phase of the cell cycle is DNA replicated?

Adaptations that result from natural selection are expected to increase the fitness of an organism. In terms of natural selection, what is fitness?

In cattle the allele for cloven hooves (H) is dominant over the allele for mule-foot hooves (h). The phenotype for each trait is shown in this picture.

What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait?

What is a change in an organism that allows for it to survive in its environment?

What are the three main parts of a nucleotide?

NUCLEOTIDES ARE THE BUILDING BLOCKS OF...

Reindeer from a rancher in Alaska escape from their pen during an enormous snow storm. After their escape, they mate with wild caribou that are migrating across the land. The offspring of these have traits for short legs and have tame behavior.

During a hurricane, a population of beetles almost gets completely wiped out. The only beetles that survived were lucky that they were in their nest at the time of the hurricane and had enough food to survive.

A chemical spill causes the offspring of ladybugs to have blue dots instead of black dots.

The country of Sweden is known for having people with blonde hair and blue eyes. One day a family moves from Sweden to India where dark hair and dark eyes are very common. A female from Sweden marries a male from India and their offspring now have blonde hair and blue eyed traits.

In a habitat there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs

Cell have several mechanisms for regulating their internal environments. Which of these mechanisms involved in maintaining homeostasis requires energy?

A segment of a DNA strand is shown.

3' AGGTCAGGT 5'

Which of these is the correct complementary DNA strand for the segment shown?

Which part of a DNA molecule is responsible for the direct coding of specific traits in an organism?

An illustration of how a particular DNA mutation will most likely affect the polypeptide produced is shown. What type of mutation is illustrated?

What is the purpose of this process this process?

Photosynthesis and cellular respiration both involve the use and release of gases. Which statement correctly identifies the role of gases in the two processes?

Which two processes does this diagram most directly model?

Plant roots have extensions called root hairs. These root hairs are important in the homeostasis of the plant. Which statement best explains the importance of the root hairs to the stems and leaves of the plant?

Answer the question.

In domesticated dogs, hair type is controlled by two different alleles. The allele for wire hair is (H) and the allele for smooth hair is (h).

What two heterozygous dogs are crossed, what percentage of the offspring is expected to be homozygous for smooth hair?

In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?

Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?

In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p).

What is the expected phenotypic ratio of the offspring of a BbPp x BbPp cross if these alleles sort independently?

The four butterflies in the illustrations represent the offspring in the F1 generation.

Which statement is best supported by the phenotypes of these offspring?

Which type of active transport is displayed?

The mRNA leaves the ________ to find the ribosome to make proteins.

Choose the sequence of the mRNA strand that would be match up with to the following strand:

GTAGTCA

Select the DNA sequence below that demonstrates a subsitution mutation.

Original DNA: AAT - GCC

What is the name of the process in which DNA is transcribed into RNA?

Which process is shown?

What part of the plant responds positively to gravity?

Venus Flytrap flower reacts to a bug.

Which letter represents the most recent common ancestor of sponges and mushrooms?

Which type of evolution is characterized by the interaction and mutual influence of two species on each other's evolution?

Which type of evolution is demonstrated by the development of different species from a common ancestor due to different environmental pressures?

What type of evolution is described by the sudden appearance of new species followed by long periods of little change?

Which type of evolution is exemplified by the development of similar traits in species of different lineages due to similar environmental challenges?

What is the term for the rapid evolution of diversely adapted species from a common ancestor?

Which type of evolution involves the accumulation of small genetic changes over long periods of time?

What type of evolution occurs when two species evolve in response to changes in each other over time?

Which traits were selected for in whale ancestors?

The hypothesis that evolution of a species occurs gradually over time as a slow and constant process is known as

The hypothesis that evolution of a species occurs in periods of rapid change separated by periods of little or no change is called

By far, the largest group(total numbers) of plants are the?

The waxy waterproof layer on the leaves and some stems of plants is called the _________________.

The tiny opening on the plant that lets air in and holds water in is called the ___________________.

Growth of plant towards or away from gravity