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rewona [7]
3 years ago
15

Question 1

Biology
1 answer:
svlad2 [7]3 years ago
3 0

Answer: Humans can cause damage to the stability of ecosystems by removing the flowering trees and shrubs

Explanation:

we have the same test

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A host organism needs time, often days, to mount an immune response against a new antigen, but memory cells permit a rapid respo
nikklg [1K]

Answer:

The answer is <em><u>D. </u></em>

Explanation:

Viruses can evade the processing and presentation of antigens, for example by interfering with the expression of MHC class I proteins, although this increases their susceptibility to be detected by natural killer cells (NK). However, some members of the herpesvirus, papillomavirus, retrovirus, poxvirus and flavivirus families have also developed strategies to escape the attack of NK cells and promote their survival, inhibiting cell apoptosis. Finally, some pathogens often change surface antigens frequently, as in the case of influenza viruses (orthomyxovirus).

The human immunodeficiency virus (HIV) affects CD4 + T cells and degrades the host's ability to counterattack with a strong cell-mediated immune response. There are so many tactics of immune evasion used by HIV, which have so far hindered the development of an effective vaccine.

7 0
3 years ago
4. Chargaff's research had shown that there are four monomers in DNA, in which two are always present in equal
viva [34]

Answer:

The monomers of DNA are individual nucleotides: cytosine,  guanine, adenine, and thiamine,  (A, T, C, G, respectively). Since DNA is a double-stranded molecule, each nucleotide has a match that chemically interacts with it to form nucleotide pairs

Explanation:

8 0
3 years ago
Identify early ideas about evolution?
Setler79 [48]

Explanation:

Naturalists began to focus on the variability of species; the emergence of paleontology with the concept of extinction further undermined static views of nature. In the early 19th century Jean-Baptiste Lamarck (1744–1829) proposed his theory of the transmutation of species, the first fully formed theory of evolution.

In classical Latin, though, evolution had first denoted the unrolling of a scroll, and by the early 17th century, the English word evolution was often applied to 'the process of unrolling, opening out, or revealing'. It is this aspect of its application which may have been behind Darwin's reluctance to use the term.

hope it helps you

6 0
3 years ago
Read 2 more answers
During what process would the OCA2 gene be copied in an individual?
AnnyKZ [126]
The OCA2<span> gene's function is to provide inst</span><span>ructions in the process of making the p protein, hence the former name of the gene as P gene.An example of this process is the manufacturing in the body of melanin. The process of copying of OCA2 is called translation.</span>
7 0
3 years ago
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The root cap is a tough structure that protects the
slamgirl [31]
Protects the growing tip of the plant
5 0
3 years ago
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