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masya89 [10]
3 years ago
9

What evidence do we have that DNA exists?

Biology
1 answer:
makvit [3.9K]3 years ago
3 0
Dna exists in the cells of all living organisms and dna proves evolution
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What is a major challenge of current space exploration?
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Eukaryotes have a second membrane to protect what important structure
Alexus [3.1K]

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Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes. However, unlike prokaryotic cells, eukaryotic cells have: a membrane-bound nucleus. numerous membrane-bound organelles (including the endoplasmic reticulum, Golgi apparatus, chloroplasts, and mitochondria)

Explanation:

4 0
3 years ago
The mrna codon CUU could mutate to C___ and still code for leucine, which could be a neutral mutation. What is the blank?
Lelechka [254]
A codon is a sequence of three bases found on the messenger RNA (mRNA) molecule which is translated to produce an amino acid. Each amino acid is coded by one or more specific codons. If the codon is changed through a mutation, the amino acid produced may be different. However, in this case, the other codons that produce Leucine are:

UUA, UUG, CUU, CUC, CUA and CUG

So the code CUU could mutate to CUC, CUA or CUG and leucine would still be produced.
8 0
3 years ago
Which structure is perforated with pores to allow material to move in and out of the nucleus?.
erastovalidia [21]

The nuclear envelope is perforated with pores to allow it to move in and out of the nucleus.

Every cell in the body has a nucleus, except for mature erythrocytes (red blood cells). While some cells contain more than one nucleus such as skeletal muscle and some other cells contain several nuclei.

The nuclear envelope surrounds the nucleus. i. e. largest organelle of the cell. It has a similar structure to that of

the plasma membrane. But the nuclear envelope contains tiny pores that allow a few substances to pass between it and outside the cytoplasm, i.e. the cell contents excluding the nucleus.

Therefore, the nuclear envelope is perforated with pores to allow it to move in and out of the nucleus.

To know more about the nucleus, refer to the below link:

brainly.com/question/2437355

#SPJ4

5 0
1 year ago
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