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serious [3.7K]
3 years ago
13

Cells need to bring in molecules to carry out cellular processes. Often, this requires moving the molecules across the cell memb

rane against the concentration gradient. How do these molecules get into the cell?A. passive transport by diffusionB. active transport using ATPC. passive transport by osmosisD. phagocytosis
Biology
1 answer:
aniked [119]3 years ago
5 0

Answer:

B (active transport using ATP)

Explanation:

Movement of substances normally occur in the direction of concentration gradient/difference i.e. the difference in concentration of a substance across a membrane. Letting molecules diffuse or pass down their concentration gradient does not require energy but pumping those molecules against gradient requires energy in form of Adenosine triphosphate (ATP). This process is called Active transport.

In order to perform certain cellular processes, cells need to move substances from their surroundings into the cell across their cell membrane. Moving this substances against the concentration gradient between the cell membrane and its extracellular fluid requires energy (ATP).

An example is the sodium-pottasium pump employed by animal cells in which they expend energy to move K+ molecules into the cell and Na+ molecules outside the cell against the concentration gradient of their cell membrane and extracellular solution.

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A plant breeder has determined the following variances for yield of corn in his fields:
Law Incorporation [45]

Answer:

A. VG = 80

B. Broad sense heritability = 0.80

C. Narrow sense heritability = 0.30

D. Average yield = 430 Units

Explanation:

A. Given that

VA = 30

VD = 50

VI = assumed not available

Therefore

Total genetic variance (VG) = VA + VD

= 30 + 50

= 80

VG = 80

B. Given that

VP = 100

VG = 80

Broad sense heritability, H2 = VG/VP

= 80/100

= 0.80

C. Given that

VA = 30

VP = 100

Narrow sense heritability, h2 = VA/VP

=30/100

= 0.30

D. The difference in selection = 500 - 400

= 100

Recall,

Selection response is heritability multiplied by selection differential.

That is

R = h2S

Selection differential = 100

Heritability h2 = 0.30

Selection response = 0.30 × 100

= 30units

Therefore, expected average yield = 400 + 30

= 430 Units

6 0
2 years ago
BEST ANSWER GETS BRAINLIEST!!!!!!!!
sp2606 [1]

Answer:

Phrases that are only used in one area of the country.

Explanation:

Forensic Linguists specialize in cadence of speech, grammatical lapses, or terms associated with a specific region.

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3 years ago
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sergij07 [2.7K]

The correct answer is D. species.


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They are typically by sexual reproduction. Boundary which is between closely related species they becomes unclear.

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