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2 years ago

The strand of dna used in the previous problem undergoes a mutation, such that the second c from the 3' end is changed to a

1 answer:

6 0

This mutation type is a substitution mutation. Substitution mutations may be silent or may have adverse effects (missense mutation).
Adverse effects come about because the change in codons in mRNA transcribed from the DNA strand. A point substitution can change the amino acid being coded for in the particular polypeptide change. If that animo acid is a structural residue of the protein, the structure of the protein will be altered, which may or may not lead to a change in protein function. If that particular amino acid is a catalytic residue of the protein, it may alter the 3D conformation and charge of the active site (if protein is an enzyme) or the binding site of protein. Function of protein formed from mutated DNA will be lost or altered.

Hope this helps! :)

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What is the probability that three F2 seeds chosen at random will include at least one yellow seed

sleet_krkn [62]

63/64
all you have to do is add up all the possibilities of drawing at least 1 yellow seed 
YYY=.75x.75x.75=27/64 
YYG=.75x.75x.25=9/64 
YGY=.75x.75x.25=9/64 
GYY=.75x.75x.25=9/64 

totaling up to 63/64!!!!!

5 0

2 years ago

Read 2 more answers

A synovial joint is surrounded by a two-layer ____________ which encloses a fluid-filled space called the ____________ . the out

zloy xaker [14]

<h3>Answer; </h3>

-Joint capsule 

-Synovial cavity 

A synovial joint is surrounded by a two layer joint capsule which encloses a fluid filled space called the synovial cavity. 

<h3>Explanation; </h3>

Synovial joint is a type of a joint that joins bone with fibrous joint capsule which is continuous with periosteum of the bones that have been joined.

Joint capsule is an envelope that encloses the synovial joint and is also known as the articular capsule.

Joint capsule comprises of an outer fibrous layer membrane and the inner synovial layer membrane.

<h3>Answer; </h3>

Dense connective tissue

The outer layer of this structure consists of dense connective tissue which is continuous with the periosteum of each bone

<h3>Explanation; </h3>

The outer layer of the joint capsule is a fibrous membrane that is attached to the circumference of the articular end of each bone on the joint, therefore it surrounds the articulation.

This layer is made up of dense connective tissue which is irregular that is continuous with the periosteum of each bone in the joint. The tissue is a long spongy tissue

<h3>Answer; </h3>

Ligaments

The outer layer may be reinforced by ligaments which are bundles of collagenous fibers. Some of these bundles are part of the capsule while other are located outside of the capsule.

<h3>Explanation; </h3>

Ligaments are fibrous connective tissues that help in the articulation of bones to other bones. Ligaments are bundles of collagenous fibers which appear as a crisscross bands which attach bone to bone and help in the stabilization of joints.

Ligaments surrounds a joint to give it support and also limits the movement of these joints. Therefore when ligaments are damaged, the joints involved becomes unstable.

<h3>Answer; </h3>

Accessory structure

By definition, the structures, such as some ligaments, that are located outside the capsule are called accessory structures. 

<h3>Explanation; </h3>

The synovial joint such as the knee joint contains a synovial cavity and dense, irregular connective tissue which makes the joint capsule normally associated with accessory ligaments. These structures are called the accessory structures of the synovial joints.

The accessory structures are the pieces that help to strengthen and connect the joint. They include the fibrocartilage, fat pads, tendons, Accessory, Extracapsular, intracapsular ligaments and the bursae.

<h3>Answer; </h3>

Synovial membrane

The inner layer of the joint capsule is the synovial membrane, consisting of loose connective tissue.

<h3>Explanation; </h3>

Synovial membrane is a connective tissue which lines the inner surface of the joint capsules in a synovial joint and the tendon sheath. It may be described as a layer that lines the cavities of synovial joints bursae and the tendon sheaths.
The membrane functions to secrete the synovial fluid which lubricates the articulating joints.

<h3>Answer; </h3>

Synovial fluid

The inner lining of the joint capsule secretes a fluid called synovial fluid. This fluid is viscous, and moistens and lubricates the surfaces within the joint capsule

<h3>Explanation; </h3>

Synovial fluid is a special type of viscous fluid that is secreted by the synovial membrane in a synovial joint such as knee joint whose function is primarily lubrication of the joint.
The fluid contains special contents such as hyaluronan, lubricin and the interstitial fluid which help in the reduction of friction between the articular cartilage of synovial joints when the joints are moving.

3 0

2 years ago

Read 2 more answers

. Statements: (1) Collagen, the most abundant protein in humans, is both a fibrous protein and a glycoprotein. (2) Quaternary st

GuDViN [60]

Answer:

c. Only one of the statements is true

Explanation:

Quaternary structure, the highest level of protein organization in which association of several protein chains are closely arranged. The protein subunits are attached together by van der Waals forces and hydrogen bonds between nonpolar side chains. it is present in all the proteins which have 80 or more amino acids are present.

Collagen, is most abundant protein in the animal kingdom. It is insoluble fibrous protein present in the extracellular matrix and in connective tissue.

A protein chain has directionality consist of a free amino group at one end, and a free carboxyl group on other end.

Hence, only (2) statement is true the correct option is c.

8 0

2 years ago

Read 2 more answers

Which of these extracellular signal molecules could diffuse through a plasma membrane and bind to an intracellular receptor?

stepladder [879]

Answer:

Estrogen.

Explanation:

Plasma membrane is made of lipids and proteins. The lipids are arranged in bilayers and proteins are embedded or may span the lipid bilayer. The carbohydrates are attached on the surface of the membrane.

The molecules that are lipophillic in nature can easily diffuse through the plasma membrane. Among the molecules listed in the question, estrogen is highly lipophillic in nature and can easily cross the lipid bilayer of the plasma membrane.

Thus, the correct answer is option (d).

3 0

2 years ago

You are given an unknown cell to identify as a plant, animal, or bacteria cell. in a paragraph describe how you be able to use a

KatRina [158]

The cells all have different qualities.
A plant cell will have a cell wall (the others don't have these) and so it will be kept in a rigid shape, unlike the others which are free to be blobby. Inside a plant cell, there is also a vacuole containing cell sap. The others don't have this. Plant cells also have chloroplasts, which look similar to mitochondria on a diagram. Chloroplasts contain chlorophyll, and this is used for photosynthesis.

7 0

2 years ago