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vivado [14]
3 years ago
6

What is meant by the following statement about the cell membrane?

Biology
1 answer:
butalik [34]3 years ago
7 0
Semipermeable means something can be penetrated by a few things. that being said choices A and B can be eliminated.

Choice D would negate semi as it says all polar molecules, leaving choice C as the best answer
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forsale [732]

Answer:

13 - D

14 - D

15 - C

Explanation:

for 13

A molecule is two or more atoms chemically combined

An example would be carbon dioxide which contains the two atoms, carbon and oxygen

Reasons its not the other answers:

Electrons, Protons and Neutrons are all parts of an atom therefore they cannot be classified as molecules.

For 14

Remember an atom is the most basic unit out of the units we are talking about

The answer would be D

Reasons its not the other answers

Water is considered to be a molecules as it contains two or more atoms (hydrogen and oxygen)

Air is considered to be a mixture as it contains oxygen and nitrogen which can be separated

Salt is considered to be a compound because salt is made up of two atoms (chloride and sodium) in which they are held up by an ionic bond

For 15

The answer would be C (III only)

Carbon hydrogen and oxygen all happen to by atoms

Reasons its not other answer choices:

Like stated previously water is considered to be a molecule therefore we can eliminate the other answer choices

Other notes:

Compounds and molecules both are combinations of two or more atoms however they are not to be mixed together

the main difference between compounds and molecules is how they are held together

Compounds are held together by ionic bonds while molecules are help up by covalent bonds

compounds and molecules  are made up of atoms that cannot be separated

Mixtures - A mix of two or more substances that can be separated

3 0
3 years ago
How do plant like protist get their food and eat?
Shalnov [3]
Plant-like protists get there food from photosynthesis, which is the process of converting sunlight into energy.
5 0
3 years ago
Read 2 more answers
In South Africa, it's usually quite warm around the time of the Northern Hemisphere winter solstice and quite cool around the ti
uranmaximum [27]

Answer: True

Explanation:

4 0
3 years ago
In the context of sensory receptors, the intensity of the stimulus is communicated to the brain by varying the _____ of the acti
Ipatiy [6.2K]
The answer to this question would be: frequency

The higher intensity of the stimulus, the higher frequency of the action potential will be sent. The nerve can't send a higher action potential, so it firing at higher at higher intensity instead. So when you felt an intense pain, that means the pain receptor is firing more stimulus per second compared to low or mild pain.
8 0
3 years ago
The intermediate filaments of a neuron are also called __________
grigory [225]

answer: Neuro filaments

explanation:

Neurofilaments (NF) are intermediate filaments found in the cytoplasm of neurons. Together with microtubules and microfilaments, they form the neuronalcytoskeleton. They are believed to function primarily to provide structural support for axons and to regulate axon diameter, which influences nerve conduction velocity.

5 0
3 years ago
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