biology 1
Which reason best explains why living things need carbon?
Carbon is a source of energy.
Which is the central element for all living things?
carbon
Which is a key component of the energy molecule ATP?
phosphorus
Which component is released from the active site of an enzyme during a chemical reaction?
product
What is the primary function of the carbon cycle?
recycling the supply of carbon on Earth
Look at the levels of carbon dioxide in the data table below.
32 ppm
How does a dietician help a patient?
A dietician helps patients get the proper amount of nutrients.
Which is one of the six fundamental elements that are found in living organisms?
oxygen
What is a substrate?
a reactant that is catalyzed by an enzyme
The most abundant element in the atmosphere can also be found in
beans and whey protein.
Which statement correctly describes a chemical reaction?
Bonds between atoms break and new bonds form.
How were Redi's and Pasteur's experiments similar?
Both tested the idea of spontaneous generation.
Which reason best explains why carbon is able to form macromolecules?
Carbon can bond with many elements.
Glycogen is an energy-storage molecule in humans. A hormone that is called insulin controls the storage of glycogen in the liver. Insulin is made up of amino acids.
Glycogen is a carbohydrate, and insulin is a protein.
The picture shows a jar of honey.Which statement is correct about this food?
It contains monosaccharides, the simplest carbohydrate
Which statement correctly describes glucose (C6H12O6)?
It is a compound made of twenty-four total atoms of three different elements.
What would most likely happen to life on Earth if the carbon cycle stopped?
Life would cease to exist.
What was shown by both Redi's and Pasteur's experiments?
Living things only come from other living things.
Which statement best describes the components of nucleic acids?
They are made up of nitrogen bases, sugars, and phosphates.
Living organisms share certain characteristics of life. Two living organisms, a pine tree and a sea urchin, are pictured below.
One of the organisms gets energy from the sun, the other does not.
Which statement best describes the amount of catalyst that remains at the end of a reaction?
The amount of catalyst is the same at the end as at the beginning of the reaction.
Which statement best describes how a catalyst can speed up a chemical reaction?
The catalyst makes lower energy pathways available.
The table below shows the level of carbon dioxide in the atmosphere for a period of 50 years.
The level of CO2 has risen.
How will the level of carbon in the atmosphere change if humans do nothing to reduce their impact on the carbon cycle?
The level of carbon in the atmosphere will increase.
If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?
The rate would increase.
How are proteins and nucleic acids related?
The structure of proteins is determined by nucleic acids.
Which statement correctly compares nucleic acids and carbohydrates?
They both contain carbon, but only nucleic acids contain phosphorous.
What is the smallest unit of matter that has characteristic properties of its element?
atom
Which organisms transform nitrogen to a form that is useful to plants?
bacteria
The excretions of living organisms are best categorized as which type of factor in an environment?
biotic
Which macromolecule provides a person with most of the energy that is needed for daily activities?
carbohydrates
Which substance is considered a building block for all living things?
carbon
A substance that influences the reaction but does not participate in the reaction is a
catalyst
Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?
cell, tissue, organ, organ system, organism
Which action would most likely increase the amount of carbon in the environment?
cutting down most of the trees in a forest to make furniture
Which is biotic?
dead leaf
By which process are fossil fuels formed?
decomposition
Which term describes a pure substance that is made up of only one type of atom?
element
Lactase and carbonic anhydrase are examples of what type of substance?
enzyme
Which two substances bind using a lock-and-key mechanism?
enzyme and substrate
Which is one of the five characteristics of life?
growing and developing
Sebastian wants to make ball-and-stick models of the four macromolecules. He has colored balls for each of the elements in these molecules, including the following.For a model of which macromolecule will he need mostly black and red balls?
lipids
Which list correctly shows carbohydrates in size from smallest to largest?
monosaccharide, disaccharide, polysaccharide
Which of these elements is found in both carbohydrates and water?
oxygen
Which element provides strength to the exoskeletons of clams and oysters?
phosphorus
Sweating and panting are examples of which characteristic of life?
responding to the environment
The picture shows a carafe of olive oil.What is one of the primary functions of this food in the body?
storing energy
Which is the best definition of activation energy?
the energy required to form or break the bonds of reactant molecules
When listing the levels of organization in organisms from smallest to most complex, which level is just below organs in complexity?
tissue
Which characteristic of life best describes the process of photosynthesis?
using energy