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ziro4ka [17]
3 years ago
12

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. Instead, th

ey are shuttled across by carrier proteins in the membrane from high to low concentration. Does this process require energy from the cell? This is an example of what type of molecular movement?
Biology
1 answer:
schepotkina [342]3 years ago
3 0

Answer: this is called passive transport and it does not require energy.

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Imagine that part of a population of South American finches is blown by a storm onto an island far offshore and manages to survi
lina2011 [118]

Answer: The observation "A" leads us to conclude that the finches populations are from two different species

Explanation:

According to the biological concept of species, <em>a set of individuals are from the same species if they are able to reproduce and leave fertile offspring</em>. This is key so one species can be successful and perpetuate through time. If they cannot leave descendants, then the species will be extinct. However, it’s possible that two individuals from different species mate and have descendants, but they cannot leave fertile offspring. When they are from different species, the offspring will be sterile and it is called a hybrid.  

In the case of the South American finch, the island's finch population and mainland's finch population belong to different species because their offspring is sterile. To have different features, as different feather's color, or to have other dietary preference is not enough to say that they are different species. This is because within the same species, individuals can have variations. For example, we can different eye color and belong to the same species.

6 0
3 years ago
What is plastic texture in the earth's structure?
Allisa [31]
It is called the float
5 0
3 years ago
A man and his wife both have normal color vision, however their daughter is positive for red-green color blindness. The man sues
mixas84 [53]

Answer:

Man's genotype: XᴮY

Woman's genotype: XᴮXᵇ

Daughter's genotype: XᵇXᵇ

The daughter is not the man's child.

Explanation:

Color blindness is a sex-linked trait caused by a recessive allele located in the X chromosome (Xᴮ=normal vision; Xᵇ-color blind).

Women have two X chromosomes, while men have an X and a Y chromosomes. For that reason, women need to have two recessive alleles to be color blind, while men only need one Xᵇ to be colorblind.

Since the man has normal color vision, his genotype would be XᴮY.

If the daughter is her father's, she would have inherited his dominant Xᴮ allele, so she would have normal vision. However, she is colorblind, so her genotype is XᵇXᵇ. She is not the man's daughter.

The mother also has normal color vision, but her daughter inherited a recessive allele from her, so her genotype is heterozygous XᴮXᵇ.

3 0
3 years ago
Identify how many amino acids exist in nature and make up all proteins in living organisms.
marusya05 [52]

Answer:

The answer is 20 amino acids

6 0
2 years ago
Read 2 more answers
What role does the overproduction of organisms play in natural selection
Nataly_w [17]
The overproduction of offspring leads to competition in which only the better adapted organisms survive and reproduce.
3 0
3 years ago
Read 2 more answers
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