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
scZoUnD [109]
3 years ago
13

What type of cell is the precursor to the helper t cell?

Biology
1 answer:
sineoko [7]3 years ago
3 0
I am pretty sure it is CD4 cell
You might be interested in
Identify the nine cell structures that are labeled in the animal cell diagram given below. Provided below is a word bank; some o
loris [4]

A. The right answer is Rough endoplasmic reticulum

The granular endoplasmic reticulum is the place of synthesis (in the associated ribosomes) of the proteins secreted outside the cell and of the proteins and lipids constituting the membranes of the cellular organelles. Golgi, lysosomes, mitochondria, nucleus, ribosomes, vesicles ...). It participates in the correct folding of the proteins that have just been synthesized.


B. The right answer is Cytoplasm.

The cytoplasm corresponds to the medium found inside the cells. It is therefore delimited by the plasma membrane and contains within it, in eukaryotes, the nucleus, but also all intracellular organelles (ribosomes, endoplasmic reticulum, Golgi apparatus, mitochondria, various plastids, etc.).


C. The right answer is Smooth endoplasmic reticulum.

The endoplasmic reticulum is a eukaryotic cell organelle. He can be :

* granular (REG), that is to say associated with ribosomes that constitute the "granules";

* or smooth (REL).

The smooth endoplasmic reticulum participates in cellular metabolism, synthesizing lipids and storing calcium.


D. The right answer is Nucleolus

The nucleolus is the site of the transcription of ribosomal RNAs (rRNA) by the enzyme RNA polymerase I. These rRNAs (18S, 5.8S and 28S) will be used in ribosome production by associating with ribosomal proteins, a process that which is also facilitated by the factors contained in the nucleolus.


E. The right answer is Nucleus.

The nucleus contains the nuclear genome, consisting of DNA. DNA, bound to proteins, takes two forms, more or less condensed:

* euchromatin: less compacted, genes can be expressed;

* the heterochromatin: more compacted, on the periphery of the nucleus, the genes are extinguished or little expressed.

The nucleus is the main site of DNA synthesis (during replication for cell division) and RNA (for transcription).

The nucleus also contains a particular structure, the nucleolus, the locus of transcription of ribosomal RNAs.


F. The right answer is Mitochondria.

Mitochondria are small organelles (about 1 micrometer in length) essential in cellular energy processes.

The set of reactions that provides energy within the mitochondria constitutes cellular respiration.

Mitochondria are formed of an outer membrane, an inner membrane with many folds or ridges and a matrix which is the space between the folds of the inner membrane.


G. The right answer is Golgi apparatus.

The Golgi apparatus is an organelle of eukaryotic cells.

It is a major site for the transfer and sorting of molecules, as well as the synthesis of glycoproteins and sphingolipids.

By its position, between the endoplasmic reticulum and the plasma membrane, and its function, it is the intermediate between the maturation and the secretion of the proteins elaborated in the reticulum, it regulates the vesicular transport and is responsible for modifying the proteins by glycosylation, sulfation, etc.


H. The right answer is Lysosomes.

Lysosomes are 0.2 to 0.5 micron cell organelles present in the cytosol of all eukaryotic, animal cells, with the exception of erythrocytes ("red blood cells"). Their function is to carry out intracellular digestion (or extracellular digestion via exocytosis in the case of chondroblasts, osteoclasts and macrophages) thanks to about forty enzymes.


I. The right answer is Cell membrane.

The cell membrane delimits the cell. It separates the inside of the cell (the cytoplasm) from the outside environment. It is composed of phospholipids, between which proteins are inserted. Unlike the membranes of bacteria and plant cells, those of animal cells contain cholesterol molecules, which stiffens them and increases their impermeability to hydrophilic molecules.

5 0
3 years ago
Read 2 more answers
Otters spend most of their time in the water. Over time otters have developed a coat with soft underfur to trap warm air near th
nikklg [1K]

Answer:

Cold weather triggers the underfur to grow each winter.

Explanation:

this is because they would freeze in the cold water in the winter.

5 0
2 years ago
Waste water is"________" by bacteria in the secondary treatment.
Mekhanik [1.2K]
The answer to your question is Digested
7 0
3 years ago
What are the characteristics that unite all living organisms
Rom4ik [11]
They all contain cells
5 0
3 years ago
How does the atomic mass of an atom differ from the atomic number?
Lisa [10]
In an atom, there are basically 3 structural parts, protons, neutrons, and electrons. Protons and neutrons makes up the nucleus, meanwhile the electrons move around the nucleus.
Atomic number equals the number of protons in an atom. It's like a code for each atoms from an element, they're fixed, for example for hydrogen , it has 1 proton, therefore it's atomic number is 1.
In the other hand, the atomic mass is the total number of the protons and neutrons added up. This can be different for the same element because there may be different numbers of neutrons for the atoms. But you don't have to memorize the atomic mass, you calculate it in exams.
For example if an atom has the number of proton of 1, and neutron of 1, their atomic mass would be 2.
3 0
3 years ago
Other questions:
  • Which of the meninges is a delicate connective tissue membrane that clings tightly to the brain like cellophane wrap following i
    9·1 answer
  • How do particles in the same state/phase move?
    13·1 answer
  • Describe the structure of a gland. what is the difference between an exocrine gland and an endocrine gland?
    7·1 answer
  • During autumn, which of the os true about sunset
    11·1 answer
  • Which conditions describe the neritic zone? check all that apply
    11·1 answer
  • What is a reverse reaction?
    11·1 answer
  • Independent variable & dependent variable & control variable
    7·1 answer
  • Why are girls so complicated
    7·1 answer
  • Question 21
    10·1 answer
  • Are the predominant organic macromolecules in cells and are responsible for their structure, behavior, and unique qualities?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!