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3 years ago

The continental crust is

Biology

1 answer:

Ludmilka [50]3 years ago

3 0

The continental crust is up to 70 km thick.

Explanation:

Upto 40% of the earth is made up of continental crust. Sedimentary, igneous and metamorphic ricks make up the continental crust. It makes up the upper layer of continents and shallow seabed areas near the shores.

Continental crust is thicker than oceanic crust with a thickness ranging from 25 km to 70km continental crust makes up 70% of earth’s volume and is usually located above sea level with a few exceptions like the Zealand continental crust region which is largely under water.

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How many double-helical DNA molecules will be present in the sperm and egg cells of dogs that are diploid animals that contain 7

ElenaW [278]

Answer:

39 double helical DNA molecules.

Explanation:

Meiosis always produces haploid cells.
Sperm and Eggs are produced after meiosis.
So, sperm and egg cells of dog would have 39 chromosomes and one double helix DNA molecule is present in each chromosome comprising 39 double helical DNA molecules.

A chromosome has one DNA molecule before replication and have two DNA molecules after DNA replication.

5 0

3 years ago

You learn that a Mars lander has retrieved a bacterial sample from the polar ice caps. You obtain a sample of these bacteria and

Misha Larkins [42]

Answer:

a. conservative replication

b. semi conservative replication

c. dispersive replication

d. discontinuous replication

e. continuous replication

The CORRECT ANSWER IS C.

c. dispersive replication

Explanation:

The attached image shows a single band that becomes lighter (in volume) and increase in darker intensity (in times of color) is revealed with consecutive replications. The major pattern that would produce these outcome is dispersive replication.

Conservative replication do reveal two bands (a 14N for the wholly latest molecule, and a 15N for the totally antiquated molecule) after the initial replication. Therefore, this wholly wrong.

Semi-conservative replication reveal an individual band of transitional weight after the initial replication, followed by two bands following the second replication (one of transitional weight, and the other at the 14N position). These two bands is observed in each following replication, with the transitional weight becoming lighter in color as the 14N band is seen to appear darker in color.

The real pattern gives an individual band that pinpoints to all molecules in an individual replicative cycle possessing the same constituents.

Dispersive replication, has its molecules to be a blend of old (15N) and new (14N) strands. Each replication raises the ratio of new to old strands as it explains the reason an individual band is shown raised (lighter in weight) with every replication.

4 0

4 years ago

Which of the following best describes an aspect of a membrane's molecular structure that causes it to be selectively permeable?

atroni [7]

Answer:

d. Transport proteins within the membrane serve as a tunnel for molecules to enter the cell.

Explanation:

Solutes are typically moved across the cell through either passive or active transport. The cells, surrounded by a bilipid layer or plasma membrane is amphiphlic- its polar, hydrophilic lipid heads face outwards, while their non-polar hydrophobic lipid tails face inwards towards each other.

While lipid-soluble molecules move across the layer easily, it is also difficult for charged and also large molecules to move across its surface, into the cell. Transmembrane channels, embedded within the membrane, help to maintain selective permeability as transport proteins, pores and gated channels. Simple diffusion happens as a method of passive transport in cells through plasma membranes.

The solutes travel through the plasma membrane in the process of diffusion from regions of high concentration to regions of low concentration; this occurs without the use of energy. Molecules moving against their concentration require active transport mechanism to cross the membrane.

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3 years ago

Which of the following is NOT a part of the oxygen cycle?

Svet_ta [14]

Answer: 2. Precipitation

Explanation:

Aerobic cellular respiration requores oxygen. Photosynthesis does, as well.

4 0

3 years ago

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Which pictures would best represent Adams in the gas of a neon sign? Explain why

Stella [2.4K]

Answer:

The correct answer is B

Explanation:

The gas particles occupy the entire container that contains them, colliding with the walls of the same, the degree of separation between the particles is large. The gases have no defined shape or volume, are highly compressible

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3 years ago