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
____ [38]
3 years ago
15

What are the substances that skeletons are composed of ?

Biology
2 answers:
Sunny_sXe [5.5K]3 years ago
5 0

Rigid skeletons are formed from materials including chitin (in arthropods), calcium compounds such as calcium carbonate (in stony corals and mollusks) and silicate (for diatoms and radiolarians).

agasfer [191]3 years ago
5 0

Answer:

Rigid skeletons are formed from mostly of collagen, bone is living, growing tissue. Collagen is a protein that provides a soft framework, and calcium phosphate is a mineral that adds strength and hardens the framework. This combination of collagen and calcium makes bone strong and flexible enough to withstand stress.

Explanation:

You might be interested in
How many pairs of legs do insects have? five four three
-BARSIC- [3]

Answer:

a spider has 4 pairs of legs, since they have 8 legs

5 0
3 years ago
Which of the following is the best source of
Vera_Pavlovna [14]

Answer:

Scientific journal B:

Explanation:

HOPE IT'LL HELPS!!

7 0
3 years ago
Which of the following human activities does NOT release carbon dioxide into the atmosphere?
NISA [10]
The Fish does not give off Carbon Dioxide
4 0
3 years ago
Calculate the final concentration of BSA in the problems below using the formula
Rudiy27

Answer:

A. C_2=1.5\frac{mg}{mL}

B. C_2=0.075\frac{mg}{mL}

C. C_2=0.01\frac{mg}{mL}

D. C_2=0.001\frac{mg}{mL}

Explanation:

Hello.

In this case, we must compute the final concentration in all the cases so we solve for it in the given equation:

C_2=\frac{C_1V_1}{V_2}

Thus, we proceed as follows:

A. Here, the final diluted solution includes the 300 μL of the 5 mg/ml-BSA and the 700 μL of TBS.

C_2=\frac{300\mu L*5\frac{mg}{mL} }{(300+700)\mu L}\\\\C_2=1.5\frac{mg}{mL}

B. Here, the final diluted solution includes the 50 μL of the 1.5 mg/ml-BSA, the 450 μL of water and the 500 μL of TBS.

C_2=\frac{50\mu L*1.5\frac{mg}{mL} }{(50+450+500)\mu L}\\\\C_2=0.075\frac{mg}{mL}

C. Here, the final diluted solution includes the 10 μL of the 1 mg/ml-BSA and the 990 μL of TBS.

C_2=\frac{10\mu L*1\frac{mg}{mL} }{(10+990)\mu L}\\\\C_2=0.01\frac{mg}{mL}

D. Here, the final diluted solution includes the 10 μL of the 0.1 mg/ml-BSA and the 990 μL of TBS.

C_2=\frac{10\mu L*0.1\frac{mg}{mL} }{(10+990)\mu L}\\\\C_2=0.001\frac{mg}{mL}

Best regards.

7 0
3 years ago
(b) Vaccination against the measles virus will not protect the child against the rubella virus. Why?
vekshin1
The measles virus and rubella virus are two separate viruses. They have different DNA and RNA structures, and the vaccination for the measles virus only "knows" how to attach itself to measles and destroy the virus. It doesn't know how to attach itself to the rubella virus to destroy it, as the vaccination is needed to inform it how to.

The advantage of vaccinating a large amount of the population is that it reduces the chance someone will catch sickness by a great amount, and can possibly eradicate the virus.
8 0
3 years ago
Other questions:
  • Why are the sepals and petals reffered to as "accessory parts" of the plant?
    13·1 answer
  • In a series of experiments, Avery treated heat-killed nonvirulent S bacteria with enzymes that degraded the proteins, DNA, and R
    12·1 answer
  • Explain how the Earth is tilted during the spring and fall equinoxes.
    15·1 answer
  • Write a short paragraph describing the role of all four types of lipids: fats, phospholipids, waxes, and steroids
    11·2 answers
  • Analysis of the second swab has confirmed that the causative organism is Streptococcus pyogenes, a gram-positive organism. Imagi
    5·2 answers
  • 3 ...The greatest curiosity of the study remains to be mentioned; it was a ponderous folio volume, bound in black leather, with
    7·1 answer
  • If proteins do not have the correct structure, they cannot function properly. Protein misfolding is a cellular malfunction that
    14·1 answer
  • What do conduction and convection have in common?
    11·1 answer
  • What is Photosynthesis?​
    11·2 answers
  • Which of these body cavities is a long, continuous cavity located on the back of the body?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!