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3 years ago

Which statement describes what is happening at high tide?

Biology

2 answers:

kkurt [141]3 years ago

5 0

C is what I believe as true.

dolphi86 [110]3 years ago

4 0

Answer:

The correct answer is option C.

Explanation:

The gravitational force of the moon creates a force called the tidal force. This gravitational pull or tidal force pulls Earth and its water to bulge out on the side closest and the side farthest from the moon.

These bulges of oceanic water are called high tides. The gravitational pull of the Sun and the moon makes the water in the oceans bulge that result in ongoing change between low tide and high tide.

Thus, the correct answer is option C.

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4.(01.01 MC) What must happen for scientific theories to be accepted as valid?

ivolga24 [154]

Answer:

Scientific evidence must be reported, verified, and accepted by the scientific community.

Explanation:

7 0

3 years ago

The structure of hemoglobin consists of ____________ chains. two of the chains are ____________ and two are beta proteins. each

svlad2 [7]

In most mammals, hemoglobin consists of 4 distinct subunits. These subunits consist of an aminoacid chain (aminoacids are the building blocks of proteins) and a heme group. 2 of the subunits have a protein chain with a-structure and 2 have a protein chain with beta structure. The heme groups give hemoglobin and thus blood its red color. Each of these groups has a positively charged iron ion in its core. Iron is necessary so that hemoglobin can bind oxygen and transfer it through the blood flow to the tissues. Given the above exposition, the correct answers are: 4, alpha proteins, heme, iron, oxygen.
Bonus: Hemoglobin is an important example of protein structure since it shows that not only aminoacid order (secondary structure) and configuration of protein chains (tertiary structure) are crucial to the function of a protein; how the multiple chains bind to each other is equally critical (quaternary structure).

4 0

2 years ago

(a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps deter

Viefleur [7K]

Active transport occurs against the electrochemical gradient. It needs energy to move molecules from the lower concentration side to the higher concentration side. The mode of transport is active transport. 

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There are three main different types of transport across the membrane

Simple diffusion ⇒ Does not need energy to occur
Facilitated transport ⇒ Does not need energy to occur
Active transport ⇒ Needs energy to occur

Active transport is the transport of molecules that move against the electrochemical gradient, so it does need energy to happen.

Molecules move from the lower concentration side to the higher concentration side of the membrane.

Carrier proteins are in charge of active transport. The needed energy might proceed from the ATP molecules or the membrane's electric potential.

In the exposed example, a scientist wants to determine how substance L enters a cells in a culture.

The cells maintain a 120 mM intracellular concentration of substance L.

Varying external concentrations of substance L (10 to 100 mM) in culture medium (Table 1).

Table 1. Rate of entry of substance L into mammalian cells in culture

External concentration of substance(mM) Rate of entry of substance L

10 5%

20 25%

30 45%

40 65%

50 80%

60 90%

70 95%

80 100%

90 100%

100 100%

Now, we need to identify the most likely mode of transport across the membrane for substance L, and explain how information provided helps determine the most likely mode of transport.

We know that the intracellular concentration is 120mM.

As we can see, this concentration exceeds all of the culture media concentrations. Yet, the substance keep moving into the cell.

As the concentration inside the cell is always higher than the concentration outside, we can assume that this is not passive transport because the molecule transport is going against its concentration gradient.

Hence, the remaining option is active transport. And as said before, we can see it because the substance keeps crossing the membrane toward the cell interior despite its concentration being higher in the interior of the cell than in the exterior.

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6 0

2 years ago

Which is one way that skin helps protect the body from infection?

lions [1.4K]

Answer:

Its A.

Explanation:

Correct on gradpoint my dooods!

8 0

2 years ago

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Which is the best approximation of the density a buoy would need to be to test water conditions at a depth of 2000 meters?

DIA [1.3K]

GAnswer:

Explanation:

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3 years ago