These are the basic building blocks of all living things. *

A. DNA
B. Cells
C. Genes
D. Chromosomes

Answer:

cells

Explanation:

Circle the compounds that are acids. Underline the ones that are bases. Distilled water Dish soap Drain cleaner Vinegar Detergent Milk Orange juice Deodorant Window cleaner Toilet cleaner

to help scientists predict weather, what can aircraft do that no other technology can do?

Question: Do you think there’s sufficient evidence in the article to conclude that bright red leaves in the fall help protect the trees in the winter? Explain your answer.

Article:
Every autumn, traffic creeps along New England’s roads as visitors look everywhere but at the road. These tourists flock to the region as soon as leaves begin to change color from a summery green to spectacular shades of red, orange, yellow, and purple.

“Being in the Northeast during autumn is just about as good as it gets in this country,” says David Lee. He’s a botanist at Florida International University in Miami.

Lee studies leaf color, so he’s biased. But plenty of other people share his admiration. Areas of the United States with especially colorful fall displays attract thousands of leaf peepers.

Even as they “ooh” and “aah,” few people know what makes many plants blush in the autumn. Research has shown that leaves change color when their food-making processes shut off. The chemical chlorophyll, which gives leaves their green color, breaks down. This allows other leaf pigments—yellow and orange—to become visible

But “there’s still a lot we don’t know about this,” Lee says.

It isn’t clear, for example, why different species of plants turn different colors. Or why some trees become redder than others, even when they’re standing right next to each other. And no one knows exactly how global warming will alter forests and affect leaf-peeping season.

Food factory
In summer, when a plant is green, its leaves contain the pigment chlorophyll, which absorbs all colors of sunlight except green. We see the reflected green light.

The plant uses the energy it absorbs from the sun to turn carbon dioxide and water into sugars (food) and oxygen (waste). The process is called photosynthesis.

As days get shorter and colder in the autumn, chlorophyll molecules break down. Leaves quickly lose their green color. Some leaves begin to look yellow or orange because they still contain pigments called carotenoids. One such pigment, carotene, gives carrots their bright-orange color.

But red is special. This brilliant color appears only because the leaves of some plants, including maples, actually produce new pigments, called anthocyanins.

That’s a strange thing for a plant to do without a reason, says Bill Hoch of the University of Wisconsin in Madison. Why? Because it takes a lot of energy to make anthocyanins.

Why red?
To figure out the purpose of the red pigment, Hoch and his coworkers bred mutant plants that can’t make anthocyanins and compared them with plants that do make anthocyanins. They found that plants that can make red pigments continue to absorb nutrients from their leaves long after the mutant plants have stopped.

This study and others suggest that anthocyanins work like a sunscreen. When chlorophyll breaks down, a plant’s leaves become vulnerable to the sun’s harsh rays. By turning red, plants protect themselves from sun damage. They can continue to take nutrients out of their dying leaves. These reserves help the plants stay healthy through the winter.

The more anthocyanins a plant produces, the redder its leaves become. This explains why colors vary from year to year, and even from tree to tree. Stressful conditions, such as drought and disease, often make a season redder.

Now, Hoch is breeding plants for a new set of experiments. He wants to find out whether turning red helps plants survive cold weather.

“There’s a clear correlation between environments that get colder in the fall and the amount of red produced,” he says. “Red maples turn bright red in Wisconsin. In Florida, they don’t turn nearly as bright.”

More protection
Elsewhere, scientists are looking at anthocyanins in other ways. A recent study in Greece, for instance, found that as leaves grow redder, insects eat them less. On the basis of this observation, some scientists argue that red pigments defend a plant against bugs.

Leaves may turn red in the autumn to protect themselves from the sun’s ultraviolet rays.



J. Miller
Hoch rejects that theory, but Lee thinks that it might make sense. He points out that red leaves contain less nitrogen than green ones do. “It may actually be that insects avoid red leaves because they’re less nutritious,” Lee says.

However, “it’s pretty confusing at this point,” Lee admits. “People debate back and forth.”

To settle the debate, scientists will need to look at more species under more conditions, Lee says. So, he’s now researching leafy plants rather than trees. He’s especially interested in tropical plants, whose leaves turn red when they’re young rather than old.

You can do your own leafy experiments. Observe the trees in your neighborhood and keep track of weather conditions. When autumn begins, write down when the leaves change, which species change first, and how rich the colors are. You can even see anthocyanins under a simple microscope. After several years, you might start to notice some patterns.

Brainlest to most explained person.
What is genetically modified food?

A universal indicator can be used to determine the exact pH. What other devices can determine an accurate measurement?

A resource, such as oil, that cannot regenerate in a reasonable amount of time is called
A. nonrenewable
B. renewable
C. restricted
D. scarce

the thin layer of epithelial tissue in the small intestines works somewhat like a cell membrane. how does its structure relate to its function in digestive system?
ANSWER ASAP!! PLZ

Can someone help me with this question?

"A student records the amount of time it takes mice to run through a maze "
( there is a photo of the A-D answers )

This is science but I put biology because I can't seem to find a science button, Thanks!

Why is water, an inorganic compound, necessary for life?

How many chromosomes are present in the human cell nucleus? *

A. 23 chromosomes or 46 pairs
B. 46 pairs or 92 chromosomes
C. 46 chromosomes or 23 pairs
D. 32 chromosomes or 16 pairs

give me a definition for Protista kingdom. WILL MARK BRAINLYIEST AS SOON HAS I CAN.

This diagram is of an amniote egg.

What is the correct label for C in this diagram?


umbilical cord


womb


yolk sac

placenta

The major benefit of solar energy is its low:
A)cost
B)pollution
C)maintenance
D)complexity

Study the graph about seismic waves.

ANSWER NOW SO I CAN GET OF THIS STICKING COMPUTER!!!!! 100pt
A scientist is using a microscope to observe a type of bacteria. Which two structures would the scientist most likely see? nucleus and DNA DNA and cell wall and vacuole and nucleus

People are often reminded to conserve water. Explain why we should conserve water if water is never lost but is constantly recycled throughout Earth.

What are comets?
please type with your own words

A plate boundary where an ocean plate collides with a continental plate forms _________

A ridge
A subduction zone
A strike slip fault
A tsunami

can someone pleasee choose the correct answer xx

What could I do to increase the current created by electromagnetic induction? (Choose all answers that apply)

generate more electric charges

Use a stronger magnet

Use more loops in the wire

put it at a higher elevation

The current that is created is always constant

which level comes just after atoms in the organization chart of living things?
A. Cells
B. Molecules
C. Organs
D. Tissues

I am the gatekeeper to the “brain” of the cell.

Molecule that carries the genetic instructions for all living organisms. *

A. DNA
B. Genes
C. Chromosomes
D. Nucleus

ASAP I NEED ANSWER NOW!!!
The distance between Saturn and the Sun is 9.54 AU. (One AU is the same as 150 million kilometers.) This distance in kilometers is ___________million kilometers.

Half of these come from one parent and half come from the other parent. *

A. DNA
B. Genes
C. Chromosomes
D. Nucleus

The first (correct and rational) answer gets brainliest!!!!

What are the main differences between the Pfizer coronavirus vaccine and Moderna coronavirus vaccine that are being reported? Any similarities?

The_____ in density causes an object to sink and the _____ intensity causes an object to float. 



Fill in the blank

The image below shows a certain type of global wind:

The Earth is shown as a circle. Equator is shown and labeled at 0 degrees. 30 degrees north and south latitudes are shown and labeled. 60 degrees north and south latitudes are shown and labeled. Curved arrows are shown from the top and bottom ends of the circle towards 60 degrees north and south latitudes.

What best describes these winds?

A. Trade winds blowing in a curved manner due to the rotation of Earth
B. Polar easterlies blowing in a curved manner due to Coriolis Effect
C. Polar westerlies that curve due to air above poles being relatively cooler
D. Jet streams that curve due to air above equator being relatively warmer

compare and contrast the way plant and animal cells are protected from their environment