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
ipn [44]
3 years ago
10

Assuming Biological substances are 90 percent water and the density of water is 1.0 x 10^3 kg/m^3, estimate teh masses (density

multiplied by volume) of the following.
a. a spherical cell with a diameter of 1.0 um (volume = 4/3 pi(r^3)
b. a fly, which can be approximated by a cylinder 4.0 mm long and 2.0 mm in diameter (volume = 1pi(r^2)
Biology
1 answer:
Anastaziya [24]3 years ago
3 0
A) The answer is 5.2 · 10⁻¹⁴ kg

It is known that the mass (m) is density (D) multiplied by volume (V):
m = D · V
D = 1.0 · 10³ kg/m³
m = ?
V = ?

Let's calculate the volume.
The volume (V) of a spherical cell is V = 4/3 π r³        (r - radius of a sphere)
r = ?     
d = 1.0 um = 1.0 · 10⁻⁶ m
Since radius is a half of the diameter, then:
r = d ÷ 2 = 1.0 · 10⁻⁶ m ÷ 2 = 0.5 · 10⁻⁶ m
It is known than π = 3.14
Therefore:
V = 4/3 π r³ = 4/3 · 3.14 · (0.5 · 10⁻⁶)³ = 4/3 · 3.14 · 0.5³ · (10⁻⁶)³
                    = 4/3 · 3.14 · 0.125 · 10⁻⁶*³ = 4/3 · 3.14 · 0.125 · 10⁻¹⁸ = 0.52 · 10⁻¹⁸
                    = 5.2 · 10⁻¹⁷ m₃

So, now when we know D and V, it is easy to calculate m:
m = D · V = 1.0 · 10³ kg/m³ · 5.2 · 10⁻¹⁷ m³ = 5.2 · 10⁻¹⁷⁺³ kg = 5.2 · 10⁻¹⁴ kg


b) The answer is 12.56 · 10⁻⁶ kg
It is known that the mass (m) is density (D) multiplied by volume (V):
m = D · V
D = 1.0 · 10³ kg/m³
m = ?
V = ?

Let's calculate the volume.
The volume (V) of a fly in the shape of cylinder is V = h π r²
h = 4.0 mm = 4.0 · 10⁻³ m
r = ?     
d = 2.0 mm = 2.0 · 10⁻³ m
Since radius is a half of the diameter, then:
r = d ÷ 2 = 2.0 · 10⁻³ m ÷ 2 = 1.0 · 10⁻³ m
It is known than π = 3.14
Therefore:
V = h π r³ = 4.0 · 10⁻³ · 3.14 · (1.0 · 10⁻³ )² = 4.0 · 10⁻³ · 3.14 · 1.0² · (10⁻³ )² =
                 = 4.0 · 10⁻³ · 3.14 · 1.0 · 10⁻³*² = 4.0 · 10⁻³ · 3.14 · 1.0 · 10⁻⁶ =
                 = 12.56 · 10⁻³⁻⁶ = 12.56 · 10⁻⁹ m³

So, now when we know D and V, it is easy to calculate m:
m = D · V = 1.0 · 10³ kg/m³ · 12.56 · 10⁻⁹ m³ = 12.56 · 10⁻⁹⁺³ kg = 12.56 · 10⁻⁶ kg
You might be interested in
Please help me answer these questions thanks you :))
Makovka662 [10]
2. third quarter 7. first quarter 1. waxing gibbous 8. waning gibbous 5. waning cresent 3. waxing cresent
6 0
3 years ago
Binding Ca2+ to the troponin complex causes ____________ to move
mylen [45]

Answer:

Tropomyosin

Explanation:

The calcium binding to troponin and induces the muscle contraction. The active binding site gets exposed due to the calcium binding.

The calcium ions then attaches with troponin molecule. This changes the shape of troponin and removes the tropomyosin protein from the binding site.  No ATP is available during this process.

Thus, the correct answer is option (d).

7 0
3 years ago
Read 2 more answers
Which hormone released by the highlighted structure inhibits the secretion of fsh only inhibin?
qwelly [4]

Inhibin hormone released by the highlighted structure inhibits the secretion of FSH only.

<h3>What is inhibin hormone?</h3>
  • A protein called inhibin is secreted by the granulosa cells in women and the Sertoli cells in men.
  • It decreases the amount of LH-releasing hormone in the hypothalamus and prevents the pituitary gland from producing and releasing follicle-stimulating hormone.
  • Inhibin is a factor in the feedback control of FSH secretion in both males and females going through puberty.
  • Follistatin suppresses FSH-subunit expression like inhibin, whereas activin enhances it, which in turn influences FSH production and secretion.
  • Inhibin A is secreted by the corpora lutea and dominant ovarian follicles in women, which helps to explain why levels are so high during the late follicular and luteal stages.
  • During the late luteal and early follicular phases of the menstrual cycle, inhibin B is reciprocally raised.

Learn more about inhibin here:

brainly.com/question/17257108

#SPJ4

Disclaimer: The question given in the portal is incomplete. Here, The complete question.

Question: Which hormone released by the highlighted structure inhibits the secretion of FSH only?

5 0
1 year ago
State two changes which take place in the flower after pollination​
lorasvet [3.4K]

After pollination and fertilization following changes occur in a flower: The petals, stamens, style and stigma of the flower fall off.  Sepals dry up and hold the ovary.  The ovules confined in the ovary develop into seed

6 0
3 years ago
Remodeling a kitchen to add additional cabinets to existing ones also means adding extra support. In a similar respect bone remo
zimovet [89]

Answer:

Option 4 - Calcium

Explanation:

The <em>divalent cation </em>called <em>calcium</em> is needed to provide additional support to the bone matrix.

Calcium is considered one of the most <em>important components</em> in bone development. It helps in the formation as well as maintenance of bone. During the modeling and remodeling process of bones, calcium facilitates the formation of <em>semi-hard new tissues</em> which leads to the formation of new bone which is very hard.

Due to this reason, calcium is needed to create extra bone matrix support.

7 0
3 years ago
Other questions:
  • Explain how you can tell the sex of a person by looking at that person’s karyotype.
    14·1 answer
  • What is the relationship between hydrogen bonds and polar attractions?
    15·2 answers
  • Which of the following represents an ion? (1 point)
    9·1 answer
  • What happens to the gas that enters the blood?
    13·2 answers
  • What are three different shapes, or structures of carbon based molecules
    5·1 answer
  • How long can an eclipse occur?
    7·1 answer
  • Which organism is an example of a producer. A OWL B SNAKE C MOUSE DGRASS
    5·2 answers
  • When the nursery at the hospital caught on fire, everybody rushed out with a baby. Unfortunately, after the fire was put out, th
    5·1 answer
  • Two products are the result of photosynthesis. What is the waste product produced and released by the plant?
    15·2 answers
  • VIẾT SƠ ĐỒ LAI: AA X Aa
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!