All cells are surrounded by the he plasma membrane! The membrane is composed of a philosopher bilayer
Answer:
The two terrains are strikingly different; the moon is dark-colored and covered with numerous smaller craters that are the result of countless impacts by asteroids and other things in space. On the other hand, the Australian crater is surrounded by reddish-brownish dirt and appears to be much larger and perhaps the result of one much larger impact. the two images are similar in that they both depict the surfaces of nearby planets/moons in space that contain craters (evidences of impact by asteroids/comets). One reason the moon may have more craters is because it has no atmosphere for space debris and objects to burn up in.
Answer:
B) Nearly every amino acid in the protein will change after the deletion of a base.
Answer:
Directional Selection
Explanation:
The type of natural selection that favors one of the extreme phenotypes over the intermediate and another extreme phenotype is called directional selection. Here, the extreme phenotype exhibits better survival and reproductive fitness over the other phenotypic ranges.
In the given example, the frequency of the heat-tolerant allele in microbes is shown to increase under the conditions of higher temperatures of the water of the springs in which they live.
When the temperature of spring water is increased, the frequency of the heat-tolerant allele is reduced and is increased again upon an increase in water temperature.
Since the natural selection favors the extreme phenotype (microbes with heat tolerance) when the spring water exhibits higher temperatures, it is directional selection.
Answer: d. none of the other answers
Explanation:
Enzymes that turn chemical energy into mechanical work are molecular motors.
There are three main components of cytoskeleton including microtubules, actin filaments and Intermediate filaments. Only actin filaments and microtubules carry the motor-driven transport on the cytoskeleton.
The most important feature of intermediate filaments is to provide the plasma membrane with mechanical support where it comes into contact with the extracellular matrix and other cells.
Unlike microtubules and microfilament , intermediate filaments are not involved in motility of the cells, hence do not associat with molecular motors.
Hence, the correct option is d.
