1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
blagie [28]
3 years ago
9

Activators are specific DNA sequences which increase the rate of transcription.

Biology
2 answers:
tino4ka555 [31]3 years ago
7 0

Answer:

A is your answer

Explanation:

katen-ka-za [31]3 years ago
6 0
True!!they regulate gene expression
You might be interested in
Why was Darwin reluctant to share his ideas?
mr_godi [17]

Answer:

Darwin was reluctant to publish his ideas because they went so strongly against the ideas of the day. Darwin thought that the society was not yet ready for his ideas, and he knew that there would be a lot of protest.

Explanation:

hope this helps

5 0
3 years ago
Read 2 more answers
Which of the following sentence best describes a buffer? Buffers resist change in pH of solutions by neutralizing excess acid or
Marianna [84]
It's the first one where it resist change in pH solutions by neutralizing :)
5 0
3 years ago
Read 2 more answers
Arrange these components of the mammalian immune system as it first responds to a pathogen in the correct sequence. I. Pathogen
Mrrafil [7]

Answer:

The correct sequence is:III) Antigenic determinants from pathogen bind to antigen receptors on lymphocytes.

IV) Lymphocytes specific to antigenic determinants from pathogen become numerous.

II) Lymphocytes secrete antibodies.

I) Pathogen is destroyed.

V) Only memory cells remain.

Explanation:

Effective resistance against infection is essential for the development and functioning of the mammalian organism, and for it to be effective, multiple defense systems must be available. In order to meet these objectives, the body has developed a complex system of overlapping and interrelated defense mechanisms, which together can destroy or control almost all invaders.III) Antigenic determinants from pathogen bind to antigen receptors on lymphocytes. It consists of the binding of the foreign antigen to the specific receptors existing on the membrane of mature lymphocytes. The B lymphocytes that mediate humoral immunity express antibody molecules on their surface, which bind to foreign proteins, polysaccharides or lipids in their soluble form; T lymphocytes, responsible for cellular immunity, express so-called T cell receptors (TCR), which recognize small sequences of antigenic peptides.

IV) Lymphocytes specific to antigenic determinants from pathogen become numerous.II) Lymphocytes secrete antibodies.

Activation phase: sequence of events that occur in lymphocytes as a result of specific antigen recognition. All lymphocytes undergo two fundamental changes: a) proliferation: expansion of antigen-specific clones and amplification of the protective response, in which the CD4 T lymphocyte, capable of activating CD8 B and T lymphocytes, assumes a preponderant role; b) differentiation: stage in which effector cells and memory cells are formed. The first produce various substances that can interact with the antigen, such as antibodies and lymphokines; the second are partially differentiated lymphocytes, that is, they do not become effector cells.

I) Pathogen is destroyed.

In this phase, the T lymphocytes differentiated into effector cells migrate to the sites of attack, where they carry out their functions of eliminating pathogens, while the B lymphocytes perform them in the peripheral organs themselves.

V) Only memory cells remain.

One of the most important consequences of the adaptive immune response is the establishment of the state of immunological memory, which lies in the ability of the immune system to respond more quickly and efficiently to microorganisms that have previously infected the host and it reflects the preexistence of a clonally expanded population of antigen-specific lymphocytes. We call, therefore, the immune response that the organism gives when it comes into contact for the first time with a foreign agent and from which a series of events derives that include nonspecific innate defense mechanisms and adaptive response mechanisms, if the pathogen manages to survive the first ones.

3 0
2 years ago
Kaylee is making a poster to show changes that happen in nature during winter in northern
kari74 [83]

During the winter season, the tree branches get dormant.

<u>Explanation:</u>

As the winter season starts, many plants show very slower metabolism that is the growth of the plants become very slow.

During the winter, there is very low amount of sunlight that the plants receive and so the synthesis of chlorophyll by the plants also in very small amount, and so there is least amount of sugar to metabolize by means of a slower Photosynthesis.

These tree branches become dormant during winter season, and it is mostly covered with the scales.

3 0
3 years ago
Cells that support neurons structurally and functionally are called B NEUROGLIA
Alex787 [66]

Answer:

B. neuroglia.

Explanation:

Neuroglia, also called glial cells are cells that support neurons structurally and functionally.

There exists two broad classes of cells in the nervous system which are:

  1. Neurons
  2. Glia

The neurons process information while the glia support the neuron mechanically and metabolically.

In general, there are three main types of cells that make up the nervous system including the above two.

3 0
3 years ago
Other questions:
  • 1. Some animals get water from plants they eat and others drink water
    14·1 answer
  • The primary reason that very large nuclei are unstable is due to
    7·1 answer
  • Define<br> nitrogen fixation:<br> logistic growth rate: <br> plz:)
    7·2 answers
  • In 1968, Brezhnev ordered the soviet army and troops of other eastern European nations to crush a liberal communist regime in __
    5·1 answer
  • Which statement is one of fact supporting how pH and flower color are related?
    10·2 answers
  • Write a response to this in paragraph form:
    5·1 answer
  • Which organelle triggers the destruction of skin cells responsible for the webbing of skin between the fingers and toes of a dev
    13·1 answer
  • Some cells, such as nerve cells, are programmed to always remain in the Gap 1 state. If nerve cells engage in mitosis, a disrupt
    11·1 answer
  • What are the main superorders for the class Monocotyledonae? When I searched it said there are 4 and I assume it's just the firs
    10·1 answer
  • A lion cub resembles its parents because it inherits genes that produce.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!