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DanielleElmas [232]
3 years ago
11

Which of the following is true of red blood cells? A. They live for only 120 days. B. They have multiple Nuclei. C. They live fo

r only about 20 days. D. Once created in bone marrow, they circulate for our lifetime.
Biology
2 answers:
zysi [14]3 years ago
8 0
Correct answer is (D. Once created in bone marrow, they circulate for our lifetime)
stealth61 [152]3 years ago
4 0

A. They live for only 120 days is correct. They are created in the bone marrow and destroyed in the spleen "red blood cells graveyard"

B. They have multiple Nuclei. Red blood cells don't have a nucleus but some can present structures called Jolly's bodies that are small pieces of the nucleus that they lost in the differentiation process

C. They only live for only about 20 days. No, red blood cells live for about 120 days

D. Once created in bone marrow, they circulate for our lifetime. Again, they have a limited lifetime

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If adenine didn’t always pair with thymine and guanine didn’t always pair with cytosine, the new DNA ladders wouldn’t always be
zloy xaker [14]

Answer:

they wouldnt be identical because for example Guanine could be paired with thymine in the original DNA strand but could decide to pair with adenine in the replication DNA. that would make a different type of DNA.

Explanation:

DNA replication is a beautiful process. In DNA replication adenine only pairs with thymine and guanine only pairs with cytosine. this ensures that a replication of the DNA will be the same type of DNA.

Replication works like this. Helicase splits open the DNA and each side is copied by DNA polymerase. If let's say the nucleotide bases for side 1 are ATGCGA then the DNA polymerase will pair these with the matching bases TACGCT which will make the same DNA but if each base could pair with any base they want that could create a few different variations of the original DNA. ATGCGA could very well be paired with TCGACA or CGACTA which would created two different types of DNA.

3 0
2 years ago
3. When the Moon appears to be growing it is called...<br><br>A-Gibbous<br>B-Waning<br>C-Waxing​
Lorico [155]

Answer:

waxing

Explanation:

When the Moon appears smaller than a quarter, we call it a crescent. When the Moon appears larger than a quarter, we call it gibbous. When the moon is getting bigger (phases New to Full) it is waxing. When it is getting smaller (phases Full to New) it is waning.

7 0
2 years ago
Read 2 more answers
What simple machine did the Ancient Egyptians use to help them build the pyramids?
KatRina [158]
I'm not entirely sure, but I think it is B) the pulley.
5 0
2 years ago
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A
BabaBlast [244]

Answer:

Green leaves have water wich makes them hard to burn

Explanation:

Dry leaves have no relaining water in them, whick makes them very succeptible to fire, whereas the green leaves are green and therefore still have water in them. This presence of water makes them more resistant to fire.

3 0
2 years ago
Suppose the following point mutation occurred in the DNA. Will this mutation affect the protein resulting from this gene sequenc
mr_godi [17]

Answer: Option A) Yes, the 5th amino acid in the sequence has changed.

Explanation:

Absolutely, the change of CCG to CAG does cause the amino acid Proline to be substituted by Glutamine.

Thus, the single base change of cytosine to adenine in CCG and CAG resulted in a different protein.

8 0
3 years ago
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