AnswersEDG Biology A wLabCatalysts

Catalysts — Test Answers

3 verified answers
1
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Where would waxes be most common on desert plants?

A
on the inside of the plant roots
B
on the outside of the plant leaves
C
on the inside of cell walls of the stem
D
on the outside of the flower’s pollen grains
2
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A scientist is working with methane (CH4) and butane (C4H10). Which statement best compares these chemicals?

A
They are two different types of molecules that each contain the same number of atoms.
B
They are two different types of atoms that are each made up of a different number of elements.
C
They are compounds made of the same two elements, but each contain different numbers of atoms.
D
They are matter made of the same two compounds, but each contain different types of elements.
3

Which reaction is exothermic?

A
a reaction that absorbs energy from the environment
B
a reaction that requires an activation energy
C
a reaction that releases energy into the environment
D
a reaction that does not involve a change in energy
4

Which recent discovery led to a new understanding of how genetic mutations increase the risk of cancer?

A
double helix structure of DNA
B
BRCA1 and BRCA2 genes
C
nucleic acid monomers
D
formation of tumor suppressor proteins
5

A doctor suspects that one of her patients has a deficiency in one of the six key elements found in living organisms. He has low energy and extremely weak, soft bones. Based on this information alone, which nutrient supplement will she most likely prescribe?

A
phosphorus
B
zinc
C
sodium
D
sulfur
6

Which sample is most likely an unsaturated fat?

Question illustration
A
sample A
B
sample B
C
sample C
D
sample D
7

Read the following information from a Material Safety Data Sheet (MSDS) about the chemical hydrochloric acid (HCl).“Skin Contact: In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Thoroughly clean shoes before reuse. Get medical attention immediately.”Based on this information, which is the most important thing to do right away if a student spills HCl on his shirt?

A
Remove the shirt, and rinse the skin with water.
B
Remove the shirt, and find a sink to rinse it in.
C
Get help from a classmate immediately.
D
Call 911 to get medical attention immediately.
8

A dietician examines the diet of a patient who is complaining that he is unable to build muscle mass. The patient eats mainly fresh fruits, vegetables, pasta, bread, and some fats and oils. Which type of supplement will the dietician most likely recommend?

A
citric acid
B
fatty acids
C
nucleic acids
D
amino acids
9

Which accurately represents these building blocks of matter from the smallest to the largest?

A
atom → molecule or compound
B
molecule → atom → element
C
compound → molecule → element
D
molecule → atom or element
10

Which statement describes how enzymes and substrates are related?

A
The enzyme influences the speed of change from substrate to product.
B
Enzymes are released as substrates in a chemical reaction.
C
An enzyme is a special kind of substrate in a chemical reaction.
D
Substrates combine with enzymes to form reactants.
11

A Venn diagram can be used to compare and contrast nucleic acids.Which characteristic would be correctly found in B?

Question illustration
A
contain ribose
B
consist of two strands
C
made of nucleotides
D
have an R group
12

Which component is affected when a catalyst is added to a chemical reaction?

A
the amount of substrate
B
the activation energy
C
the amount of product
D
the concentration of reactants
13

After a hunt, a wolf eats more food than it needs at that time. The extra glucose combines to form which substance?

A
starch
B
glycogen
C
cellulose
D
sucrose
14

The brothers pictured below are identical twins.The boys in this picture look alike because their bodies contain identical

Question illustration
A
carbohydrates.
B
lipids.
C
nucleic acids.
D
proteins.
15

How does a catalyst influence a chemical reaction?

A
It speeds up or slows down a chemical reaction by direct participation.
B
It reacts with products to increase the concentration of reactants.
C
It decreases the amount of energy necessary for the reaction to proceed.
D
It increases the total amount of products formed.

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