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grandymaker [24]
2 years ago
7

How Do Sugar Molecules Cross the Cell Membrane?

Biology
1 answer:
Shalnov [3]2 years ago
8 0

Answer:

The correct answer is - through facilitated diffusion and active transport.

Explanation:

Glucose is a six-carbon sugar molecule that is directly utilized by cells to provide energy. A glucose molecule is large enough to go through a cell membrane with simple diffusion.  

Cells help glucose molecules to cross the cell membrane through facilitated diffusion and active transport. Active transport is of two types primary and secondary active transport to help the glucose molecule to cross the membrane.

Thus, the correct answer is - through facilitated diffusion and active transport.

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A scientist was studying bones from an individual who died thousands of years ago. Which portion of the bones was the scientist
ludmilkaskok [199]

Answer: Minerals

Explanation: The body decomposes and after about 40 to 50 years bones are mostly brittle and dry with no traces of flesh. After thousands of years bones also disintegrate (decay) leaving brittle mineral frame. The life of bones is determined by the soil type its buried in, nuetral soils takes longer then acidic soil condition.

In this case osteocytes(bone cells) are the first to decompose followed by the cartilage and bone marrow, leaving behind mineral traces that scientist can study after thousand years.

7 0
3 years ago
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The cell membrane
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3 years ago
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Cual es la diferencia entre la cantidad de CO2 en el ambiente y en nuestros pulmones
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6 0
3 years ago
Black coat color in horses is conferred by the presence of a dominant B allele. Chestnut horses are genotype bb. A population of
AysviL [449]

Answer:

Frequency of B allele is 0.6681

Explanation:

If p represents the frequency of dominant allele and q represents the frequency of  recessive allele, according to Hardy-Weinberg equilibrium:

p + q = 1

p² + 2pq + q² = 1

where p² = frequency of homozygous dominant genotype

q² = frequency of homozygous recessive genotype

2pq = frequency of heterozygous genotype

Given that number of recessive chestnut horse = 28

Total horses = 226 + 28 = 254

frequency of b² genotype = 28/254 = 0.1102

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So, frequency of B allele =

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7 0
3 years ago
Which of these CORRECTLY explains the difference between the processes of photosynthesis and respiration?
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Answer:

The correct answer would be C) The Calvin cycle takes place only in the chloroplast.

The major difference between photosynthesis and respiration is that photosynthesis takes place only in plants while respiration takes place in all the living organisms including plants and humans.

Green plants and few bacteria contain special organelle called chloroplast which enables them to perform photosynthesis.

Hence, Calvin cycle (light independent phase of photosynthesis) takes place only in plants that too in chloroplasts.

In contrast, Krebs cycle usually takes place in mitochondria in both plants and animals and glycolysis takes place in the cytoplasm of the cell.

The electron transport chain takes place in mitochondria in animals whereas in plants it takes place in both mitochondria and thylakoid membrane.

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3 years ago
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