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DiKsa [7]
3 years ago
9

Cells of the immune system are able to respond to the presence of invading organisms because they recognize the?

Biology
2 answers:
tino4ka555 [31]3 years ago
8 0
C DNA pattern in the nuclei of viruses
Akimi4 [234]3 years ago
3 0
A antigens on invadors
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How are iconic and covalent bonds alike? How are they different?
Rzqust [24]
Different: in covalent bonds, atoms share electrons, whereas in ionic bonds atoms transfer electrons.

Alike: Both ionic and covalent bonding lead to the creation of stable molecules.
8 0
2 years ago
Producers are usually the first organisms listed in a food chain. They provide energy to the other organisms in the food chain.
Sliva [168]

Hi!

The answer is C. The Sun

The energy that producers get from the sun, along with water, allows them to begin photosynthesis, the process in which they make their food, because they are not able to absorb other forms of energy because they are plants.

I hope this helps!!

5 0
3 years ago
In the breakdown of taxa above there is something missing. There is a category above "kingdom" in the system above, a taxon call
ra1l [238]

Answer:

The three-domains of Carl Woese's Classification system include archaea, bacteria, eukaryote, and six kingdoms are Archaebacteria (ancient bacteria), Eubacteria (true bacteria), Protista, Fungi, Plantae, AnimaliaExplanation:

8 0
3 years ago
Read 2 more answers
30 POINTS AND BRAINLIEST
tatiyna

Answer:

i think the answer would be d

Explanation:

5 0
3 years ago
Rank the following levels of chromatin compaction in eukaryotes from the least compact to the most compact.
Scilla [17]

Answer:

a. Naked dna

f. nucleosome

e. solenoid

g. loop domain

d. chromatid

c. chromosomes

b. metaphase

Explanation:

The naked DNA consists of the DNA molecule not associated with proteins.

A nucleosome is an octamer of histone proteins (i.e., dimers of H2A, H2B, H3, H4) associated with DNA.

A solenoid is a chromatin fiber consisting of 30 nanometers (nm), it represents the secondary structure of the chromatin.

The chromatin fibers are organized into loops (300 nm) that represent the tertiary structure of the chromatin. These loops enable to package chromosome segments consisting of about 100 kilobases (kb).

The sister chromatids are two identical DNA-based structures that remain joined together by the centromere to form a single chromosome (700 nm).

4 0
3 years ago
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