Answer:
Question 1: A Chordate
Question 2: C Sea Anemones
Question 3: B Lobster
Question 4: A Arachnid
Explanation:
Chordates are all the animals that have vertebrates (backbones)
The phylum Cnidaria includes those that have cnidocytes which are specialized cells for capturing prey. This includes sea anemones, jellyfish, and coral.
Arthropods are those that have an exoskeleton, segmented body, and paired jointed appendages like lobsters and other crustaceans.
Arachnids are animals that have eight legs, like spiders.
Answer:
Motor neurons:
A. Function:
It relay messages coming from the brain or spinal cord to the muscles or organs.
B. Structure:
●Presence of long axons due to long distances the signals have to travel to the muscle its stimulating.
●It's myelinated, to assist the signal in travelling long distances as soon as possible.
Sensory neurons:
A. Function: its sensory receptors respond to stimuli by converting it into an electrical signal to the brain or spinal cord.
B. Structure:
●Presence of long dendrites / axons
● its myelinated
●since it's found in the middle of the neuron it forms ganglia that unites in the spinal cord and aid in involuntary reflexes.
Interneurons:
Structure:
● shorter than motor or sensory neurons
● has branches, a lot of branches consisting of axons and dendrites off the cell body to enable multiple simultaneous between neurons
● It's body is partially myelinated.
●occurs in large clusters of neurons to compensate for its partial myelination to speed up the signal
Answer:
A
Explanation:
1 parent cell - 2 genetically identical offspring cells
hope it helps!
Answer: The DNA on the paternal copy of the chromosome will be methylated at the imprinting center, while the DNA on the maternal copy of the chromosome will not be methylated in this region.
Explanation:
Chromosomes are DNA structures associated with proteins such as histones. They are found in the nucleus of cells and contain genetic information for the development and functioning of an organism. Human beings are diploid, meaning that they possess two copies of each of the 23 chromosomes (a total of 46).
Gametes, which are sex cells such as the sperm (produced by the male) and the egg (produced by the female) that are haploid. This means that they possess only one chromosome of each pair. During fertilization, a male gamete fuses with a female gamete to generate a zygote, which will give rise to a new human being. <u>This new individual will possess half of the genetic material from its father and half from its mother. Thus having a total of 46 chromosomes, 23 from each parent</u>.
Genetic imprinting modulates gene expression by chemical modification of DNA and/or modification of chromatin structure. Often, genetic imprinting causes a gene to be expressed only on the chromosome inherited from one of the parents. One example of imprinting is DNA methylation, which is a process by which methyl groups are added to DNA. <u>Methylation modifies DNA function when found in the promoter gene, repressing gene transcription. This means that a methylated gene will not be expressed</u>, that is, it will not produce a protein encoded by that gene. So, if a region of DNA is imprinted in the sperm cell, the paternal chromosome inherited from this sperm will be methylated in the genes of the offspring. And the offspring will only express the maternal copy inherited, which will not be methylated.
