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
seraphim [82]
3 years ago
15

WILL BE MARKED BRAINLIEST!!!!

Biology
1 answer:
Alexxandr [17]3 years ago
5 0

Answer: Option E) polar

Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are polar

Explanation:

Amino acid-derived and peptide hormones such as serotonin, epinephrine, dopamine etc, are unable to diffuse across a cell membrane because they consist of several repeating units of amino acids with positively charged or negatively charged side chains.

Thus, the side chains make these hormones water-loving (hydrophilic), and impassable to the hydrophobic layer of the cell membrane.

You might be interested in
A species of finch has been studied on one of the geographically isolated Galapagos Islands for many years. Since the island is
emmainna [20.7K]
B) Inherited some advantageous variations
7 0
4 years ago
A. what is a positively charged ion; an atom which has lost an electron
a_sh-v [17]
A positively charged ion is called cation.
A negatively charged ion is called anion.
A salt is formed by the ionic bonding of a cation and an anion.
pH is a measure of the hydrogen ion concentration in a solution.
7 0
3 years ago
Caffeine aids in the movement of calcium ions across cell membranes by both making it easier for the Ca2+ channels to open and b
Llana [10]

Caffeine cause dose dependent prominent increase in force of contraction and period of contraction of muscle

<u>Explanation:</u>

Caffeine is widely used in foods and drinks. Its long time use can effect central nervous system include lethargy memory, sleep disorder and anxiety.

Increase in concentration of calcium ion will result increase number of power stroke and force for contraction.  However latent period and relaxation period are unaffected by caffeine. Increase in concentration of calcium ion will result increase number of power stroke and force for contraction.

Because of calcium ion release in skeletal muscle, caffeine causes peripheral manifestation such as hyper-reflexia, muscle twitching etc.

High amount of caffeine leads to increase in release of Ca2+ from sarcoplasmic reticulum. It increases tension development in single tetanic contraction and re-initiate maximum tension in fatigue single myofibre by restoring Ca2+ release from sarcoplasmic reticulum to non-fatigued levels.

8 0
3 years ago
in pea plants round seeds are dominant and wrinkled seeds are recessive. the cross rr x rr, what percentage of the offspring wil
In-s [12.5K]

Answer:

0%

Explanation:

Round = Dominant

Wrinkled = recessive

Recessive = r

Dominant = R

homozygous dominant = RR

homozygous recessive = rr

Heterozygous= Rr

Since both seeds are homozygous recessive (rr)

In your punnet square, one lower case r will go on the top and the left side

r r

r

r

Something like that.

Go across your four boxes and you will end up with;

rr, rr

rr, rr

In order for it to be round, at least one box would need to have to be a heterozygous(Rr) or be a homozygous dominant.

7 0
1 year ago
PLEASE I NEED ASAP | What do Virginia watershed programs do? Check all that apply.
mixer [17]

Answer:

Assist with flood reduction.

Explanation:

The Virginia watershed program was organized and directed the secretary of Agriculture to assist local governments in protecting them against flood during storms within the sub - basins of watersheds. The basis of the Virginia watershed programs is to assist the local governments to protect, restore and enhance local watersheds. It's provide both technical and financial support.

A watershed is an area of land that drains into a lake or river.

7 0
4 years ago
Read 2 more answers
Other questions:
  • Science and engineering techniques used to manipulate living cells to produce useful products
    14·1 answer
  • 4. You have 263 mL of liquid mercury, what is the mass of mercury that you have? (Note:
    9·1 answer
  • A student drew the following flowchart to show the movement of nutrients.
    6·2 answers
  • Which situation allows evolution doing gene duplication
    12·1 answer
  • Please can anyone help me out in this whole definition actually I can't understand it ​
    10·1 answer
  • Match each statement to the type of behavior it describes.
    5·1 answer
  • Which planets have evidence of water on the surface? Select two options.
    13·2 answers
  • What features are present in both a plant cell and bacterial cell
    11·2 answers
  • The Basic Building Blocks of proteins are called amino acids.Why are proteins essential to all life?
    15·1 answer
  • What drives motility in sporozoa?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!