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3 years ago

Active transport requires energy because it usually involves the movement of

Biology

1 answer:

hram777 [196]3 years ago

6 0

Answer:

Explanation:

When a substance moves from low to high concentration it is moving against its concentration gradient, which requires more energy.

A. It depends on where it is moving, not the substance

OB. This is describing diffusion

OC. Does not require energy, it is passive transport through a semi-permeable membrane

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A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 4 picograms of DNA

damaskus [11]

Answer:

b: 8;8

Explanation:

Mitotic or meiotic cell division constitute the m phase of the cell cycle. At the end of the m phase, the new cells enter the interphase stage of the cell cycle. The interphase is further sub-divided into;

the $G_0$ phase,
the $G_1$ phase,
the S phase; and
the $G_2$ phase.

The $G_0$ phase is essentially a resting phase. Cells that do not need to divide except when necessary move into this phase after exiting the m phase.

Actively dividing cells enter the $G_1$ phase after exiting the m phase. Cell development and growth takes place. From there, the cells enter the S phase where DNA replication/synthesis takes place. The cells then enter the $G_2$ phase where proteins are synthesized in preparation for division or m phase.

At the S phase, the amount of DNA a cell carries is doubled but the chromosome number remains the same. For example, if a cell enters the S phase with 2 g of DNA containing 10 chromosomes, at the end of S phase, the amount of DNA would have come 4 g while the number of chromosomes will remain 10.

Hence, if the average amount of DNA in the assayed cells immediately after mitosis is 4 picograms, the amount would be 8 picograms at the end of S phase and will still remains 8 picograms at the end of $G_2$ phase.

The correct option is b.

8 0

3 years ago

You would like to know whether the progeny of a pair of mated fruit flies are distributed among the resulting four phenotypic cl

Effectus [21]

Answer:

C. The differences between the observed and expected counts are too large to be attributed to chance.

Explanation:

The p-value of the statistic represents the chance that the observed count is based on luck or chance. When p value too high, the research can't be used since the chance that its not represent real condition are too high. Most researchers use 5% (0.05) as the cutoff of something called statistically significant. In this research, the p-value is 0.04 or 4%, so it is statistically significant.

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3 years ago

The condensation of _____ formed the early oceans. It is an important part of the water cycle.

MissTica

The condesation of water vapor

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3 years ago

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How are fats absorbed into the lymph? how are fats absorbed into the lymph? in the form of glycerol in the form of chylomicrons

katovenus [111]

The correct answer is in the form of chylomicrons.

Digested fats are resynthesized into triglycerides inside the epithelial cells, and there they're coated by proteins. Such structures are called chylomicrons (small globules composed of protein and lipid). The chylomicron is water-soluble and that allows it to travel outside of the cell and enter the lymphatic capillaries-lacteals.

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3 years ago

The area inhabited by a population is known as its:.

Nonamiya [84]

The area inhabited by a population is known as its geographic distribution.

have a great day!

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2 years ago