Answer: C. The C horizon is very deep.
Horizons are the layers of soil develops as a result of soil formation. Horizon lies parallel to the earth surface. Each horizon differs from the other on the basis of amount or organic matter present, color of the soil, texture of soil and other components making up horizon, and amount and type of minerals present in the soil.
C horizon is the horizon that lies deeper region of the collective soil horizon. It consist of unweathered or partially weathered rocks or their aggregates. Therefore, it retains the original chemical composition of the parent rock. This results in the higher mineral content as compared to other horizons. This horizon also lacks the organic matter as no or very little decomposition activity of plant and animal matter takes place. Therefore, color of soil in this horizon in the absence of organic matter remains light.
Hence, a sample of soil from a C horizon is light brown in color and has a high content of a mineral called feldspar is because of the fact that the C horizon is very deep.
Aquaporin (AQUA1) transport H₂O orders of magnitude faster across the erythrocyte plasma membrane than GLUT1 transports glucose because: AQUA1 does not undergo any conformational change while transporting water molecules whereas GLUT1 does and therefore has lesser Vmax.
Aquaporin is a transmembrane protein that transports water molecules across the membrane. These are the passive channel proteins, thus they do not have to undergo any conformational change while transporting the molecules.
GLUT1 is a glucose transporter that is a carrier protein performing facilitated transport. It can be abundantly found in RBCs and brain tissues. Since it is facilitated transport, the glucose is transported down its concentration gradient.
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Increased in pitch (frequency). It's the doppler effect.
Answer 1: Option C, heterozygous dominant
Explanation: For example the genotypes of these true breeding white and purple flowers is pp and PP, respectively, then the offsprings would be all Pp. This is a heterozygous genotype and it will express dominant trait only.
Answer 2: Option C, homozygous recessive
Explanation: If the trait is recessive, then it will express only when both the alleles of the genotype are recessive alleles. And this would be homozygous state. For example, 'pp' would be the genotype for white flowers.
Answer 3: Option D, white and red
Explanation: If we want that all offsprings should be heterozygous, then parents should be true breeding, which means homozygous. Here, roan is a heterozygous trait [WR]. So both parents should be homozygous, like RR and WW. Then only all offsprings would be heterozygous.
The question is incomplete. The complete question is as follows;
Examine and characterize the two motor pathways in the stretch patellar reflex.
A) Alpha motor neurons send efferent messages to the quadriceps, while parallel efferent messages to the hamstrings are reduced.
B) Alpha motor neurons send efferent messages to excite the quadriceps and the hamstrings are reduced.
C) Alpha motor neurons activate the quadriceps. Once the quadriceps have contracted, alpha motor neurons inhibit the hamstrings.
D) Interneurons excite alpha motor neurons, which in turn excite the muscle.
Answer:
Alpha motor neurons send efferent messages to the quadriceps, while parallel efferent messages to the hamstrings are reduced.
Explanation:
Neuron is the structural and functional unit of the nervous system. The neurons can be classified as sensory neuron, motor neuron and interneuron based on their function.
The knee reflex is known as patellar reflex that involves in the movement of knees and stretching of patellar tendon. The efferent message is send by alpha motor neuron that are located in the anterior horn of the spinal cord. This send to quadriceps that results in the muscle contraction. In this process, the hamstrings messages are reduced that plays an important role in patellar reflex.
Thus, the correct answer is option (A).