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LenKa [72]
3 years ago
12

Darwin visited the Galapagos Islands several times. During his trips, he observed some differences in the finches living on each

of the islands. He noted that the finches had many traits in common; however, each had a different beak. Some beaks were short, some long. Some beaks looked straight, while others curved. Darwin believed that each species of finch was related but had developed some special beak adaptations. He suggested that the finches had developed these adaptations because there were different food sources on each island. The curved beaked finches ate berries. The straight beaked finches burrowed for worms. The short beaked finch ate only seeds. Each beak was well suited for the specific food source.
What is the main idea of this paragraph?

Darwin likes finches.

Finches are picky eaters.

The Galapagos Islands are a nice place to visit.

Darwin believed the shape of the finch's beak was related to the food it ate.




Question 3(Multiple Choice Worth 2 points)


A genotype describes

what an individual looks like

how an individual will pass on traits

how long an individual will live

the genetic make up of an individual
Biology
2 answers:
Julli [10]3 years ago
7 0

First: Darwin believed the shape of the finches beak was directly related to its food source.

Second: A genotype decides the genetic makeup of an individual, (green eyes, blue eyes, brown eyes, etc.)

FinnZ [79.3K]3 years ago
5 0
Darwin believed the shape of the birds beak was related to the food it ate, the genetic make up of an individual
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Answer:

The missing options are:

A) protein subunits associated with gap junctions.

B) a type of adhesive junction connecting an epithelial cell to the basal lamina.

C) collection of fibrous intracellular attachment proteins.

D) create a permeability barrier.

E) button-like points of strong adhesion between two cells.

F) hollow cylinders associated with gap junctions.

G) type of adherens junction connecting cells with the extracellular matrix.

H) intermediate filaments associated with plaques.

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J) type of adhesive junction containing actin microfilaments.

K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms.

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Set of answers are:

A) protein subunits associated with gap junctions. <u>Conexin</u>

B) a type of adhesive junction connecting an epithelial cell to the basal lamina.<u> Hemidesmosome</u>

C) collection of fibrous intracellular attachment proteins.<u> Plaque</u>

D) create a permeability barrier. T<u>ight junctions</u>

E) button-like points of strong adhesion between two cells. D<u>esmosome</u>

F) hollow cylinders associated with gap junctions. <u>Connexons</u>

G) type of adherens junction connecting cells with the extracellular matrix. <u>focal adhesion</u>

H) intermediate filaments associated with plaques. <u>Tonofilaments</u>

I) collection of adherens junctions particularly associated with epithelial cells.

J) type of adhesive junction containing actin microfilaments. <u>Adherens junctions</u>

K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms. C<u>ell junctions</u>

L) point of cytoplasmic contact between two cells. <u>Gap junction</u>

M) anchors cytoskeleton of one cell with that of a neighboring cell. <u>Adhesive junction</u>

<u />

Explanation:

<u>Connexin:</u> is a transmembrane protein that forms the gap junctions, they are also called gap junctions proteins.

<u>Hemidesmosome junctions:</u> these types of junctions are in the epidermis, specifically between the epithelial cells and the basal lamina of the epidermis.

<u>Plaque:</u> they are part of the adherens junctions, they are fibrous proteins that are attached to certain points of the extracellular matrix.

<u>Tight junctions</u><u>:</u> are junctions between two epithelia, they are very restrictive and do not allow the passage of soluble molecules creating a permeability barrier.

<u>Desmosomes</u>: are very strong cell to cell junctions on the lateral sides of plasma membranes. They are in tissues that are under mechanical stress, such as the cardiac muscle.

<u> Connexons:</u> is a pore made of six connexin proteins in a gap junction. Connexons are the ones that connect two cells in gap junctions.

<u>Focal adhesions:</u> They connect the extracellular matrix with the cell, regulatory signs and mechanical force is transmitted through them.

<u>Tonofilaments:</u> tonofilaments are the ones that are associated with a plaque in adherens junctions, they are in epithelial tissues.

<u>Adherens junctions:</u> are cell to cell junctions where the cytoplasmatic face is connected to the actin cytoskeleton. They appear as spots forming the plaque or as zonula adherens, which are actin bands around the cell.

<u>Cell junctions </u>are protein complexes that connect two cells that are next to each other or a cell with the extracellular matrix. They have a lot of functions, such as pas information from cell to cell, or the exterior, form a barrier, synchronize cells, etc.

<u>Gap junctions:</u> are connections between the cytoplasm of two cells, molecules and, ions pass directly from one cell to the other.

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