The alveoli are surrounded by __________ carrying blood to and from the heart.

Biology

2 answers:

joja [24]3 years ago

8 0

The alveoli are surrounded by tiny blood vessels, called capillaries carrying blood to and from the heart.

iVinArrow [24]3 years ago

6 0

The alveoli are surrounded by <u>blood vessels</u> carrying blood to and from the heart.

C) blood vessels

Hope this helped! :)

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What is the purpose of RNA polymerase?

tresset_1 [31]

RNA polymerase (green) synthesizes RNA by following a strand of DNA. RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, duyring the process of transcription.

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3 years ago

What holds the monomers of a single strand of nucleic acid together in a chain?

Tpy6a [65]

Answer:

Nucleic acids are of two types DNA and RNA which are made up of monomeric units called nucleotides.

One monomer is one nucleotide which further consists of three parts:

1: Nitrogenous base

2: Sugar (a ribose sugar in RNA and a deoxyribose sugar in DNA)

3: Phosphate group

Explanation:

If we talk about single strand of nucleic acid DNA or RNA, there is a phosphodiester linkage that holds monomers together in a strand of nucleic acids. This phospho di ester linkage is formed when a condensation reaction occurs between a hydroxyl group of two sugars and a phosphate group.

You can see a better representation in attached figure.

Hope it help!