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Dmitry_Shevchenko [17]
3 years ago
10

URGENT HELP: VIEW THE SCREENSHOT BELOW

Biology
1 answer:
IrinaK [193]3 years ago
7 0

Answer:

Gene flow

Explanation:

Gene flow describes the process where genetic information migrates to another population, introducing new alleles into the gene pool and increasing the variation in that population.

Having physical barriers would prevent this exchange of information. For example, two populations separated by a mountain range or body of water would have far less chances to interact and exchange genetic material. This would make it difficult for gene flow to occur.

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If a dna analysis reveals that a cell has 60 ng of adenine and 20 ng of cytosine, how much thymine and guanine are in the cell?
Serggg [28]

Answer:

Thymine= 60 ng

Guanine= 20 ng

The complementary base pairing occurs between adenine and thymine and guanine and cytosine bases.

Explanation:

According to the Chargaff rule, a double-helical DNA molecule has an equal number or equal amount of adenine and thymine bases since adenine always pairs with thymine. Similarly, the amount of guanine base is equal to that of the cytosine base.

Chargaff rule is based on the complementary base pairing between purine and pyrimidine bases. According to the given information, the amount of adenine is 60 ng. Therefore, the cell would have 60 ng thymine. Similarly, the amount of the cytosine base in the cell is 20 ng which means that the cell would have 20 ng of guanine base.

5 0
3 years ago
During a donation drive, $9210 was collected by 80 students. Each girl donated $120 and each boy donated $105. How many girls ar
Pepsi [2]
Total→$120×80=$9600__suppose all 80 is girls
extra→$9600-$9210=$390
difference→$120-$105=$15
opposite→$390÷$15=26boys
girls→80-26=54
6 0
3 years ago
Because of the presence of both activation and inactivation gates, voltage-gated Na channels can A. be activated B. all of these
gladu [14]

Because of the presence of both activation and inactivation gates, voltage-gated Na channels can be all of these.

  • Sodium voltage-gated channels can be either closed, open, or inactive.
  • Voltage-gated sodium channels are closed when at rest. Both an activation gate and an inactivation gate are present in voltage-gated sodium channels.
  • Although the inactivation gate is open, the activation gate is closed. This conformation is closed but capable of opening. Some of the activation gates open as a result of membrane depolarization brought on by a stimulus.
  • Both the activation and inactivation gates will be opened at this point. As sodium ions enter the cells, nearby activation gates will open.
  • A greater amount of sodium will enter the cells as a result, initiating an action potential.
  • Both gates open when certain depolarization thresholds are reached. Action potential increases to its maximum as sodium rushes into the cell.
  • The inactivation gate will gradually close and the permeability of the membrane to sodium ions will decrease. The channel is now in a state known as "closed but not capable of opening."
  • Up until the membrane potential reaches its resting state, this occurs. The channels once more assume the "closed but capable of opening" conformation when resting values are attained.

learn more about  Na channels here: brainly.com/question/12977601

#SPJ4

7 0
2 years ago
How does the Classification system distinguish between organisms?
polet [3.4K]

Answer:

By organising them into five major kingdoms and further dividing each kingdom into phyla (or divisions), classes, orders, families, genus, and species.

Explanation:

There are five kingdoms:

  1. Monera: bacteria
  2. Protista: amoeba, paramecium, euglena
  3. Fungi: yeast, rhizopus
  4. Plantae: flowering and non-flowering plants
  5. Animalia: animals (vertebrates and invertebrates)

Organisms that share the most similar features are grouped into the same species. Species with similar features fall under the same genus. Several genus make up a family, several families make up an order, several orders make up a class, several classes make up a phylum (or division), and several phyla (or divisions) make up a kingdom.

Note: there are three domains (or superkingdoms): Archea, Bacteria, and Eukarya.

5 0
3 years ago
How does the cell wall protect a plant cell?
Andrews [41]
The cell wall protects a plant cell by giving it protection and support.
The cell wall is made of cellulose which is a specialized sugar that helps give the wall structure and support to protect the inner part of the cell.
3 0
3 years ago
Read 2 more answers
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