Biology: Q2/test 1

How many total moles of KNO3 must be dissolved in water to make 1.5 liters of a 2.0 M aqueous solution?

3.0

A 3.0 aqueous HCI solution contains a total of

3.0 moles of HCI per liter of solution

Which PH number indicates the highest level of acidity.

5

The disease known as malaria may result in a fever, a decrease in red blood cell, and an enlarged liver and spleen. These symptoms are evidence of

A disruption of homeostasis

A substance directly involved in cellular communication within the human body is

A hormone

biological catalyst

A substance found in living organisms that speeds up reactions (an enzyme).

All enzymes

Affect the rate of chemical reactions

Some processes that occur in a cell are: * utilize energy * detect changes in the environment * Rearrange and synthesize chemical compounds Which process will all living organisms use to maintain homeostasis

All 3

An increase in the level of hormone A caused an increase in the level of hormone B. The increase in the level of hormone B then causes a decrease in the level of hormone A. This process is

An example of a feedback mechanism

Plants such as the Venus flytrap produce chemical compounds that break down insects into substances that are usable by the plant. The chemical compounds that break down the insects are most likely

Biological catalysts

Organisms are composed of

Both organiz and inorganic compounds

Much of the carbon dioxide produced by green plants is not excreted as a metabolic waste because it

Can be used for photosynthesis

single celled organisms are able to maintain homeostasis, even though they lack higher levels of organization such as organs and organ systems, because

Cell structures work together to maintain homeostasis in single-celled organisms

Energy from organic molecules can be stored in ATP molecules as a direct result of the process of

Cellular respiration

Two proteins in the same cell perform different functions. This is because the two proteins are composed of

Chains folded differently and a different sequence of amino acids.

Shrimp that live in cold waters off Alaska will die if introduced into warm water. One likely reason these shrimp do it survive is that enzymes in the shrimp

Change shape

More energy can be released from a fat molecule than from a gluclose molecule because the fat molecule contains more

Chemical bonds

More energy can be released from a fat molecule than from glucose molecule because the fat molecule contains more

Chemical bonds

Which part of a molecule provides energy for life processes?

Chemical bonds

single-celled organisms are able to maintain internal stability because they

Contain structures that perform life functions.

single-celled organisms are able to maintain internal stability because they

Contain structures that perform like functions.

Materials are transported within a single-celled organism by the

Cytoplasm

riding a bicycle requires balance and constant adjustment and monitoring by the rider in order to continue cycling. Successfully riding a bicycle most directly results from the ability to

Detect and respond to change

In order to enter cells and be useful to the body, starch must be

Digested into simple sugars.

The failure of the human body to effectively maintain dynamic equilibrium can result in

Disease

Water is classified as an inorganic compound because it

Does not contain carbon

A person usually experienced small variations in body temperature over a 24 hour period. These variations in temperature are an example of

Dynamic Equilibrium

One effect of uncontrolled diabetes is that the blood might develop an acidic PH. As a result, cells may not be able to regulate their internal pH. Within these cells, this would cause a disruption of the function of biological catalysts known as

Enzymes

If body temperature is too high, some blood vessels increase in size and sweat glands will excrete sweat resulting in lower body temperature. These changes are an example of

Feedback mechanisms

An animal maintains its fluid balance by regulating the gain and loss of water. This maintenance is an example of

Homeostasis

The ph of an aqueous solution changes from 4 to 3 when the hydrogen ion concentration in the solution is

Increased by a factor of 10.

Which statement explains the importance of maintains a constant internal environment t ensure proper enzyme functioning

Increasing the temperature and pH can alter the specific shape of enzymes.

The pancreas produces one hormone that lowers blood sugar level and another that increases blood sugar level. The interaction of these two hormones most directly helps humans to

Maintain a balanced internal environment.

The first successful transplant of insulin producing cells from a living donor pancreas was completed in April 2000 in Japan. This enabled the body of the recipient to

Maintain blood sugar levels throughout the day.

The action of insulin on sugar levels in the blood helps to

Maintain dynamic equilibrium

When you graph a persons blood glucose level Over time that represents

Maintenance of dynamic equilibrium

High gluclose causes

More insulin to be released.

Which two cell structures work together in the process of protein synthesis

Nucleus and ribosome

In a multicellular organism, organs carry out a variety of life functions. In a single celled organism, these functions are performed by

Organelles

Which statement best describes the organelles in a cell

Organelles must work together and their activities must be coordinated

Chemical that help chemical reactions occur at faster rates in living organisms are known as

Organic catalysts

Chemicals that help chemical reactions occur at faster rates in living organisms are known as

Organic catalysts

A student wants to test the hypothesis that an acidic environment will decrease enzyme activity. In the experiment, the student used an enzyme that breaks down hydrogen peroxide into water and bubbles of oxygen. To test the hypothesis, the student should collect data on the number of oxygen bubbles produced at different

PH levels

The function of a specific enzyme is most directly influenced by its

Physical shape

Which activity would not be carried out by an organism in order to maintain a stable internal environment?

Production of offspring by the organism

DNA is able to control cellular activities most directly be regulating the process

Protein synthesis

How do cells in the ovary detect a hormone from the brain

Receptor molecules on the cells of the ovary bind with the hormone.

Base your answer to the question on 5e informational below and your knowledge of biology. Diabetes is a condition characterized by elevated blood sugar levels. One form of diabetes occurs when insulin fails to properly regulate blood sugar levels. Complications from diabetes can include nerve cell damage and poor blood flow, especially in the feet and legs. In individuals with diabetes, wounds usually take longer than normal to heal. The failure of a cell to react in a normal manner to insulin is most likely the result of a problem with

Receptors

A function of cell membraces in humans is the

Recognition of certain chemicals

In order for the human body to maintain homeostasis, the breakdown of glucose to release energy must be followed by the

Removal of wastes

A pesticide that kills an insect by interfering with the production of proteins in the insect would most directly affect the activity of

Ribosomes

In a cell, protein synthesis is the primary function of

Ribosomes

What determines the kind of genes an organism possesses

Sequence of the subunits A,T,C and Gin the DNAof the organism

A characteristic shared by all enzymes, hormones, and antibodies is that their function is determined by the

Shape of their molecules

In living organisms, lipids function mainly as

Sources of stored energy and components of cellular membranes

What occurs during the digestion of proteins?

Specific enzymes break down proteins into amino acids

The major role of carbohydrates in the human diet is to

Supply energy for the body.

Breathing rate is constantly being monitored and adjusted in the human body, which results in

The internal environment being kept within certain limits.

Which cell structures are correctly paired with their functions.

The ribosomes make proteins and the nucleus stores genetic information

The cytoplasm in a single celled organism and the circulatory system in a human both

Transport substances throughout the organism.

What base is normally used in the synthesis of RNA but nit in the synthesis of DNA?

Uracil (U)

What substance is an inorganic molecule

Water

Which substance can enter a cell by diffusion without having to be digested?

Water

The basic building blocks of a protein are

amino acids

Before starch can enter a cell, it must be

digested to form simple sugars

In plants, simple sugars are least likely to be

linked together to form proteins

Which activity can occur without the use of energy

movement of water across a membrane