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wlad13 [49]
3 years ago
12

A substance that moves across a cell membrane without using the cells energy tends to move

Biology
1 answer:
nydimaria [60]3 years ago
6 0

Answer:

From their region of high concentration to their region of low concentration.

Explanation:

A substance that moves across a cell membrane without using the cells energy tends to move from  their region of high concentration to their region of low concentration. A good example of such a process would be Osmosis.

On the other hand if the substance moves across a cell membrane and requires the use of energy then it tends to move against a concentration gradient, as is the case with Active transport.

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It is generally followed by cytokinesis which divides the cytoplasm and cell membrane


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4 years ago
Why was helium and hydrogen the first elements to show up in the universe?
laiz [17]

Hey there! I could help you out with your question.

°.✩┈┈┈┈∘*┈┈୨♡୧┈┈*∘┈┈┈┈✩.°

According to research it claims that "Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei. ... This is when recombination occurred — neutral hydrogen (and helium) finally appeared because they could “recombine with” (hold on to) electrons without easily losing them to stray radiation."The Big Bang created the elements on the periodic table, building blocks that help make up the universe. ... In stars, hydrogen atoms fuse to create helium — the second most common element in the universe, according to Encyclopedia.com. Helium has two protons, two neutrons and two electrons. Hydrogen is known to be the first element in the periodic table of elements. It has one proton in its nucleus and one outter electron. It is a very light gas and also flammable. ... Its atomic symbol is H and its atomic number is one.

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Hope this helps .+(´^ω^`)+.

5 0
3 years ago
Hey guys could you help me out here please?
Molodets [167]

Answer:

D Jupiter

Explanation:

it is the largest planet and takes longer the spin on its axis

3 0
3 years ago
Read 2 more answers
Science work Awnser all if you dont know dont awnser Thanks!
Westkost [7]
1. energy
2.thermal equilibrium
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5 0
3 years ago
Two phenotypically normal parents have a child with CF. i. What are the genotypes of each parent? ii. What is the probability th
katen-ka-za [31]

To first dive into your question, here are some vocabulary terms that I will be using and will be helpful to you as well.

  • Homozygous dominant (BB): <em>Is not affected by cystic fibrosis</em>.
  • Homozygous recessive (bb):<em> Is affected by cystic fibrosis</em>.
  • Heterozygous (Bb):<em> A carrier for cystic fibrosis</em>.
  • Phenotype (Ex: Having cystic fibrosis): <em>The appearance of an allele pair</em>.
  • Genotype (Ex: bb): <em>The genetic makeup of an allele pair</em>.

We know that if both of the parents are phenotypically normal, there is no way that they can be homozygous recessive (bb), or have cystic fibrosis. We also know that since they have a child with this disease, they can't be homozygous dominant (BB) either. This means that <u>both parents have to be carriers (Bb)</u> in order for them to have a child with cystic fibrosis.

Below I have attached a Punnett square with both of the heterozygous parents.

<em>Each child they have will have a </em><u><em>1/4</em></u><em> or </em><u><em>25%</em></u><em> chance of having cystic fibrosis.</em>

5 0
3 years ago
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