The Himalayan rabbit’s habitat has cold, snowy winters and mild summers. The body is typically covered in white fur except for the nose, feet, tail, and ears, which are covered in black fur.

A scientist shaved an area of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area. The shaved area grew black fur. Which of these best explains why the hair that grew back where the ice pack was placed was black and not white?

Enzymes are proteins that have two primary functions. Which answer below has the correct paring of functions?

Which of the following changes will denature an enzyme from optimal conditions?

This organelle is responsible for organizing the microtubials during cell division.

Which of the following are in both prokaryotic and eukaryotic cells? Select all that apply.

What is letter A pointing at?

What is letter D pointing at?

At the cellular level, what causes a tumor?

What does the process of mitosis create?

Which of the following represents the phases of mitosis in their proper sequence?

If a parent cell has 24 chromosomes, how many chromosomes would each somatic (body cell) have?

Using the sequence below, write each complementary base pair. ATC GCA TTA CAC CCA AAG

What does A represent? What does B represent?

What does arrow 1 represent?

What elements are in DNA?

Differences in traits between individuals are determined by...

Lipids and Carbohydrates are similar in that they both ...

Which of the following are true? Select all that apply.

An individual who participates in a long-distance run on a hot day will produce large quantities of sweat. As a result of the excessive sweating, the amount of urine produced by the kidneys will change. How will the kidneys respond to help the individual’s body maintain homeostasis?

Saprophytes are fungi that feed on dead and decomposing organisms. They secrete enzymes that digest components of cell walls, such as cellulose and lignin.

The relationships among different orders of millipedes are shown in the cladogram. Based on this cladogram, which statement best describes relationships among millipede orders?

Which of the following best describes these biomolecules?

A partial meadow food web is shown.

Based on this food web, which organisms are direct sources of energy for secondary consumers?

The diagrams show some of the levels of biological organization.

In what order are the levels in the diagrams?

A student used a microscope to study four members of the phylum Ciliophora. Members of this phylum move when propelled by hundreds of tiny cilia.

Although these organisms belong to the same phylum, they are classified as different —

A model of a DNA molecule is shown. The arrow indicates-

A remora is a fish that has an adhesive disk on the back of its head that it uses to attach itself to a large shark. When food floats away from the shark’s mouth as it feeds, the remora collects the scraps. Drawings of a shark with a remora attached and a remora’s adhesive disk are shown.

The relationship between the remora and the shark is an example of —

Invasive plant species affect the interactions of living and nonliving components of an ecosystem, so the removal of invasive plants is often necessary. The goal of most plant-control methods is to disrupt or inhibit the function of different plant systems. For example, insects can be used to chew through roots in order to reduce a plant’s ability to absorb water. Which of these functions would be most immediately affected by a reduction in water uptake by roots?

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

Which of these is not a function of the integumentary system?

Peristalsis the involuntary movement of food through parts of the body. Which two systems below are working together to make this happen?

This diagram demonstrates why the ocean is a large carbon sink.

An increase in the amount of carbon dioxide in the atmosphere can cause atmospheric temperatures to increase. Which statement explains how this could affect the ocean as a carbon sink?

The diagram demonstrates a feedback process involving antidiuretic hormone (ADH). ADH increases the permeability of parts of the nephrons of the kidney, resulting in less water in the urine.

This feedback loop is likely to be activated when —

A researcher determines an organism to be eukaryotic, unicellular, and autotrophic. In which taxonomic group should this organism be classified?

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

Students examine images of a certain species of bat commonly found in Texas. Using the bat dichotomous key, they conclude that the bat species is a Mexican free-tailed bat due to its large, round ears.

Based on the dichotomous key, in addition to the shape of the bat’s ears, which other set of features should the students look for to confirm the identity of the bat?

When a new mutation occurs in a somatic cell of a sexually reproducing organism, what percentage of the individual’s offspring are likely to inherit the mutation?

Plant hormones serve as chemical messengers between cells and tissues. Auxin is a plant hormone that causes the cells on the shady side of a plant shoot to elongate. The response enabled by auxin is known as —

What are the tropisms identified by #1 and #2?