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3 years ago

Help me with this 5 questions & i mark you as brainlist please

Biology

1 answer:

vfiekz [6]3 years ago

7 0

Answer:

1- The amount of time passed in hours before getting a sunburn.

2- 30 minutes, 1 hour 30 minutes, 5 hours

3- SPF 15 so that person C won't get a sunburn until after 15 hours.

4- SPF 15 is more effective because when you add the time passed until you got a sunburn with SPF 4 and compared that to what you got when adding up the data from using SPF 15, you can see that it is more effective.

5- The number in the SPF rating stands for about how much time an average person can go without getting sunburned.

Hope this helps!

-Coconut;)

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What are the genes involved in pattern formation and organization of body parts?

kicyunya [14]

The genes involved in pattern formation and organization of body parts are called homeobox genes, which are a large family of similar genes.

The homeobox genes direct the formation of many body structures during early development of the embryo.

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3 years ago

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Sodium ions, oxygen (O2), and glucose pass directly through lipid bilayers at dramatically different rates. Which of the followi

Elodia [21]

Answer:

The correct order, from fastest to slowest, for the passage of molecules and ions through the cell membrane is oxygen, sodium ions, glucose (option D).

Explanation:

The plasma membrane is a lipid bilayer, with glycoproteins and membrane proteins, which constitutes a semi-permeable barrier to the passage of substances into and out of the cell.

The speed with which a substance can pass through the membrane depends on its chemical properties -hydrophilic substances pass through with greater difficulty than lipophilic ones- requiring in some cases specialized transport mechanisms. The different rates with which a substance passes depends on this.

Oxygen (O₂) passes through simple diffusion, depending on a concentration gradient. It's the molecule that passes through the membrane the fastest.
In second place, there would be the Na⁺ ions -charged atoms- that cross the membrane by facilitated diffusion, through specific ionic channels.
The glucose molecule, being larger, requires the use of transport proteins, being its passage through the membrane slower with respect to oxygen or sodium.

Undoubtedly, molecular weight and affinity for the plasma membrane are determining factors for the passage of molecules through the lipid bilayer.

Learn more:

Simple diffusion and active transport brainly.com/question/6420224

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3 years ago

What animal phylum do leeches belong in?

xz_007 [3.2K]

Answer:

What animal phylum do leeches belong in?

Explanation:

Leeches are segmented parasitic or predatory worms that belong to the phylum Annelida and comprise the subclass Hirudinea. They are closely related to the oligochaetes, which include the earthworm, and like them have soft, muscular, segmented bodies that can lengthen and contract.

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3 years ago

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Explain why extended exercise is considered to be "healthy"

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Many physical disorders that occur in humans are attributed to the styles of living and general eating habits. Conditions such as diabetes, depression, dymentia and even some cancers are led by bad eating habits. A friend once asked me: Now that I do not want to become obesse but want to be muscular, what will I do since I have to gain mass but I don't want to overfeed? My answer was so simple. EXERCISE
Exercise can be in many forms. The most common modes of exercise are gym and athletics. If you don't do regular exercise, your body does not find a chance to get rid of the many wastes produced by different metabolic processes. Some of these products are toxic and they lead to bad effects in the body. The effect is getting lifestyle diseases.
Exercise plays a key role in boosting your memory. During and after exercise, blood becomes more oxygenated and the supply of oxygenated blood to the brain is increased. This ensures there is renewed strength in the brain parts e.g. hypothalamous and hence boosting thinking ability.
We can not overlook the fact that exercise is fun. When exercising, you are happy and happiness makes you stay healthy.

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3 years ago

Drag the terms on the left to the appropriate blanks on the right to complete the sentences. ResetHelp synthesis of secretory pr

aniked [119]

Answer:

Explanation:

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Steroid synthesis: Mitochondrion and endoplasmic reticulum

ATP synthesis: Mitochondrion

Boundary of the cell support and regulation of cell properties: Extracellular membrane

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3 years ago