What is one difference between enzymes and coenzyme?

enzymes are proteins; coenzymes may be other substances

coenzymes are destroyed by chemical reactions

enzymes are smaller than coenzymes

enzymes are organic; coenzymes or inorganic

What would result if enzymes were not present?

cells would die from chemical reactions

foods would turn an unappealing color

the body would metabolize nutrients too quickly

What allows a particular enzyme to work on a particular substrate?

their pH levels neutralize one another

they contain the same amino acids

they carry opposite electrical charges

What situation presents a special challenge to preventing food-borne illness?

contaminated food may seem safe to eat

since microorganisms are everywhere, illness is almost impossible to prevent

many foods are not safely processed before reaching the supermarket

Methods of heat transfer are alike in that all ____.

transfer energy from a hotter substance to a cooler one

have the same rates of reaction

are equally suitable for every food

use the same medium to transfer heat

Adding heat speeds the rate of chemical reactions in food by ___.

increasing the force and frequency of molecular colisions

releasing the heat energy stored in food

creating "hot spots" in sugars and fats

When heat is applied to a substance, its molecules ___.

tumble and flow past each other

move apart until they no longer touch

remain locked in the same structure

If you cook individual chicken pieces and a whole chicken under the same conditions, ____.

the chicken pieces will be done sooner

the chicken pieces will absorb more energy than the whole chicken

the whole chicken will be done sooner

the whole chicken will burn outside before it cooks inside

How does the volume of the cookie affect baking time? (think of the chocolate chip cookies)

The smaller cookie takes longer

Why is it important not to have melted the butter when making chocolate chip cookies?

Having the ingredients in the correct state of matter controlled the rate of chemical reactions.

Melting the butter takes too much time.

Melting the butter makes mixing the dough too easy

Melting the butter removes energy from the system

Why is the temperature of the oven important?

It controls the rate of energy transfer.

To make sure you don't burn your hand.

Lower temperatures cook foods faster.

Higher temperatures cook foods faster.

The bottom of a sugar cookie has a smooth brown appearance, while the top is lighter and uneven. This is because ____.

the bottom of the cookie is cooked by conduction, while the top is convection

the bottom of the cookie is cooked by convection, while the top is conduction

A thicker cookie takes longer to bake than a thinner cookie because _____. (think of the sugar cookies)

Energy transfer occurs at the surface, the thicker cookie has less surface area

Energy transfer occurs from the inside to the outside

an indirect measure of molecular motion

The measure of the average potential energy of individual molecules

Higher temperatures increase the rate of reactions because ___.

more molecules collide faster with greater force

both conduction and convection are used

When energy is transferred by convection, it is because ____.

of the motion of fluids or gases

Which is an example of energy being transferred mainly through conduction?

a baseboard (floor) furnace vent heating a room

When baking cookies, where do more chemical reactions occur?

more chemical reactions occur on the outside of the cookie because energy is transferred at the surface

more chemical reactions occur in the center of the cookie because it cooks last

chemical reactions occur equally throughout the cookie

Mixtures can be distinguished from compounds because ____.

the parts that make up a mixture keep their properties

Pure substances ____.

Are made of up of only one material

Have definite and constant properties under certain conditions

Which of the following involves a chemical change?

Combining baking soda and vinegar

Review Midterm Fall 2023

Authored by MARTHA KENNEDY

Science

12th Grade

NGSS covered

Used 6+ times

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98 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The independent variable is part of which step of the scientific method?

Observation / question

Hypothesis

Experiment

Conclusion

Communication

The ________ serves as the COMPARISON

Independent variable

Dependent variable

Control

Constant

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a scientific experiment, the ___________ is/are considered everything except that which you are testing.

Independent variable

Dependent variable

control

constants

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A chocolate chip cookie's flavor would be an example of which type of data?

Quantitative

Qualitative

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The temperature of a chocolate chip cookie after taking it out of the oven would be an example of which type of data?

Quantitative

Qualitative

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Regarding our taste buds- food particles must be dissolved in __________ to be sensed.

air

Liquid

steam

ice

FILL IN THE BLANK QUESTION

30 sec • 3 pts

________ substances are substances that become gases easily.

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Review Midterm Fall 2023

The independent variable is part of which step of the scientific method?

The ________ serves as the COMPARISON

In a scientific experiment, the ___________ is/are considered everything except that which you are testing.

A chocolate chip cookie's flavor would be an example of which type of data?

The temperature of a chocolate chip cookie after taking it out of the oven would be an example of which type of data?

Regarding our taste buds- food particles must be dissolved in __________ to be sensed.

________ substances are substances that become gases easily.

A person who cannot distinguish flavors would be said to be

A person in a land-locked state such as Iowa not having access to fresh sea food would be an example of which influence on food choice?

A boy who chooses to eat his father's greasy bean tacos because they give him good memories of time cooking together is an example of which influence on food choice?

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