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
klasskru [66]
3 years ago
5

The accommodation of the very long DNA strands that are part of a chromosome into the limited space of the nucleus is achieved b

y coiling the DNA around beads of histones into repeating subunits. These DNA-wrapped histones are called:_______.
A. Solenoids
B. Nucleosomes
C. Chromatin loops
D. Rosettes
Biology
1 answer:
MaRussiya [10]3 years ago
7 0

Answer:

B. Nucleosomes

Explanation:

Chromatin is made up of certain repeating units called nucleosomes. Each nucleosome has a stretch of DNA that is wound around a complex of eight histone molecules. The eight histone molecules together make histone octamer. A DNA of 146 base pairs is wrapped around this scaffold made up of histone molecules.

A stretch of DNA called linker DNA joins the adjacent nucleosomes together. The DNA wound around the histone scaffold appears as a beadlike structure. One nucleosome scaffold has two copies of each of four different histone types. These are called H2A, H2B, H3, and H4. Histone H1 is joined to the linker DNA.

You might be interested in
2 and 3<br><br> 1 and 2<br><br> 3 and 4<br><br> 1 and 4
nadya68 [22]
The most likely answer here is 1 and 4.
3 0
3 years ago
Which of the following statements is the most correct regarding homeostatic imbalance? A. It is considered the cause of most dis
AfilCa [17]

Answer:  C. Positive feedback mechanisms are overwhelmed.

Explanation:

Homeostasis, is the maintenance of a normal internal environment, in the face of external and internal disturbances, so that the functions of cells and systems of the body are preserved. This is accomplished primarily through feedback systems, so when a system is disturbed, a diversity of local responses, systemic reflexes (rapid reactions and automatic stimuli) and long-term adjustments are activated to bring the system back to its normal equilibrium point.

Most systems are controlled by negative feedback mechanisms, with the controlled variable being able to "turn off" its release, in the same way as a thermostat controls the temperature of a room. So, in this context, too much positive feedback would be related to harmful effects, such as homeostatic imbalance.

8 0
2 years ago
Where do the branches of the bronchial tree ultimately end? 2. list the steps of the pulmonary circuit of the cardiovascular sys
Aneli [31]
1. The branches of the bronchial tree ultimately ends at the alveoli.
Bronchial tree consist of bronchi, bronchioles, and alveoli. Bronchi are formed as the lower part of the trachea divides into two tubes. Bronchioles are smaller tube divisions of the bronchi. It walls contain smooth muscle and no cartilage. Alveoli are tiny ends of the alveolar ducts, which functions as the site for gaseous exchange. 

2. Blood flows from the left atrium; mitral (bicuspid valves), the left ventricle, aortic valve, aorta, veins and heart, right side of the heart, superior and inferior vena cavae, right atrium, tricuspid valve, right ventricle, pulmonary valve, pulmonary trunk, pulmonary artery, lungs, pulmonary veins, then back to the heart...

3. Arteries and the veins differ in structures and they way they functions; Arteries carry oxygenated blood away from the heart to the body (except pulmonary artery) while veins carry deoxygenated blood back from the body to the heart (except pulmonary veins). A structural differences includes; the veins contain valves while arteries lack. Arteries have narrow lumen while veins have wide lumen. Lastly, blood carried by veins has higher pressure compared to blood carried in vessels.

4. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and the bronchioles. Blood moves in and out of the lungs throgh the pulmonary arteries and veins that connect to the heart.

5. The cartilage rings of the trachea
They are strong but flexible tissues which support the trachea or the windpipe while still allowing it to move and flex during breathing. Additionally these cartilage rings are C-shaped to provide room for the esophagus, which lies along the back side of the trachea.

6. Functions of the larynx includes;
To protect the airway from choking on material in the throat
to regulate the flow of air into our lungs
The production of sounds used for speech 
Larynx is part of the respiratory system and is located between the pharynx and the trachea. Humans use larynx to breathe, talk and swallow. 

7. Structures that make up the pathway of air through the respiratory system starting with the external nares; We start with; External nares, nasal cavity, internal nares, nasopharynx, laryngopharynx,oropharynx, larynx, trachea, primary bronchus, secondary bronchus, tertiary bronchus, bronchiole, terminal bronchiole, respiratory bronchiole, alveolar duct, alveolar sac and alveolus. 
6 0
2 years ago
Assume that in squashes the difference in fruit weight between a 3-lb type and a 6-lb type results from three independently segr
3241004551 [841]

Answer:

F1: Aa Bb Cc: 4.5 lbs

F2: Too many to list: Between 3 lbs and 6 lbs

Explanation:

F1: Aa Bb Cc, will be the genotypes and will weigh 4.5 lbs, the reason for that is because each capital letter allele adds half a pound to the base weight of 3 lbs.

F2: There are many different genotypes that can be present in the second generation, for example (AA BB CC, AA BB Cc, AA BB cc, etc.) each of which will allow the plant to grow to a certain height. The majority of phenotypes will be 4.5 lbs. There will be one who is AA BB CC, and another one person who has the code, aa bb cc.

8 0
3 years ago
What body system does this structure belong?
harina [27]
Circulatory system.
8 0
3 years ago
Other questions:
  • Some pathogens are naturally present in _____.
    13·2 answers
  • Which choice has eukaryotic animal cells? 1- oak 2- liver 3- virus 4- Lactobacillus
    9·1 answer
  • How does the top level of an energy pyramid compare to the bottom level of that energy:
    10·2 answers
  • Which example best illustrates a condition necessary for natural selection to occur? Cheetahs have nearly identical genetic make
    13·2 answers
  • Starch and dietary fiber are classified as
    9·2 answers
  • How does the immune system fight against pathogens?
    5·1 answer
  • Darwin's explanation for evolution was dependent on which scientific concept?A:   The ability of organisms to learn   Strike  B:
    6·1 answer
  • Cells were treated with a chemical that inhibits the first step of the electron transport chain. How would this affect the level
    6·1 answer
  • Explain different types of force briefly​
    10·1 answer
  • Biology enzymes! Help me somebody please.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!