Answer:
Rho protein.
Explanation:
Transcription may be defined as the process of formation of RNA molecule from the DNA template. Three important process of transcription are initiation, elongation and termination.
The termination may occur through rho dependent and rho independent mechanism. In rho independent termination, the rho proteins are not required and not necessary for the termination. The uracil stretch is important for rho independent termination.
Thus, the correct answer is option (b).
What are the major components of the brain? What are the principal functions of each?
Answer:
Human brain is divided into 3 major parts: fore brain, mid brain and hind brain.
Explanation:
Human brain is covered tough tissue called meninges which includes outer dura mater, middle arachnoid membrane and inner pia mater.
Human brain is divided into 3 major parts:
1. Fore brain: it consists of:
a) Olfactory bulb: It receives the impulses pertaining to smell from the olfactory epithelium.
b) Cerebrum: It forms the major part of brain. It is divided into right and left cerebral hemispheres by a longitudinal fissure. It has 3 major functional areas:
i) sensory areas: receive and interpret the sensory impulses
ii) motor areas: controls voluntary muscular movements
iii) association areas: deal with memory and communications
Each cerebral hemisphere is divided into frontal, parietal, temporal and occipital lobes.
c) Diencephalon: Roof of diencephalon is called epithalamus, it is non-nervous part. Lying superior to mid brain is thalamus, which is the coordinating center for the sensory and motor signalling. At the base of thalamus is hypothalamus, which serves as osmoregulatory, thermoregulatory, thirst, hunger and satiety centers.
2. Mid brain: It is located between thalamus of forebrain and pons Varolii of hind brain. It consists of 4 rounded lobes called corpora quadrigemina (4 optic lobes). The two superior colliculi are concerned with visual reflexes and the inferior colliculi are concerned with auditory reflexes.
3. Hind brain: Comprises of cerebellum, pons Varolii and medulla oblongata.
Cerebellum is the little brain, it controls and coordinates the locomotor movements. Pons act as the relay station between cerebellum, spinal cord and rest of the brain. Medulla includes the cardiovascular and respiratory centers, the centers for swallowing, vomiting, coughing, sneezing and hiccupping.
Show how selection, genetic drift, gene flow, and mutation relate to genetic variation. Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.
(1) Gene flow ____ genetic variation of a population
(2) Mutation ____ genetic variation
(3) Selection ____ genetic variation
(4) Genetic drift ____ genetic variation
(A) Increases
(B) May increase, decrease or maintain
(C) Decreases
(D) May increase or decrease
Gene flow, mutation, selection, and genetic drift all play a role in genetic variation. Gene flow increases genetic variation by introducing new alleles, mutation introduces new alleles, selection can increase, decrease or maintain genetic variation, and genetic drift can either increase or decrease genetic variation.
Explanation:(1) Gene flow increases genetic variation of a population. Gene flow occurs when individuals move between populations and bring new alleles with them, increasing the genetic diversity within a population.
(2) Mutation contributes to genetic variation. Mutations are random changes in DNA that can create new alleles, leading to genetic diversity.
(3) Selection may increase, decrease or maintain genetic variation. Natural selection can favor certain alleles, increasing their frequency in a population, while also removing other alleles through selective pressure, which may reduce genetic variation.
(4) Genetic drift may increase or decrease genetic variation. Genetic drift refers to random changes in allele frequencies in a population, which can lead to a loss of genetic diversity in smaller populations.
Learn more about genetic variation here:https://brainly.com/question/848479
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One oak tree cell with 14 chromosomes undergoes meiosis. How many cells will result from this process, and what is the chromosome number in each cell?
Answer:
The correct answer is - 4 and 7 chromosomes in each cell.
Explanation:
Meiosis is the cell division in which one parent cell produces four daughter cells with a half number of the chromosome than parent cells.
According to the question oak cell performed meiosis which is reduction division so the number of cell will be four and 7 chromosome will be present in each daughter oak cell.
Thus, the correct answer is - 4 and 7 number of chromosome in each.
Antiport carrier proteins
a. Allow 2 molecules to be transported in the same direction at the same time
b. Allow 2 molecules to be transported in opposite direction at the same time
c. Allow 1 molecules to be transported
d. Allow 6 molecules to be transported in opposite directions at the same time
Answer:
Option (b).
Explanation:
Carrier proteins allow the movement of the particles inside and outside the cells. Three types of porter are uniport, symport and antiport. These porters transport molecules in the different directions.
The antiporters transport two molecules at a time. These two molecules are transported in the opposite directions at the same time. The one molecule will move inside the cell and the other molecule will move outside the cell.
Thus, the correct answer is option (c).
Two eukaryotic proteins have one domain in common but are otherwise very different. Which of the following processes is most likely to have contributed to this similarity?
a. gene duplication
b. RNA splicing
c. exon shuffling
d. random point mutations
Answer:
The correct answer is option c. "exon shuffling".
Explanation:
Exon shuffling is a molecular mechanism at which two or more exons from different genes are brought together and results in the formation of new genes. If two eukaryotic genes have one domain in common but are otherwise very different it is very likely that exon shuffling contributed to this similarly. Probably, the exon that encodes for the domain that the two proteins have in common was taken from one protein for the formation of the second one.
Final answer:
The most likely process contributing to the similarity between two eukaryotic proteins with a common domain is exon shuffling, a process of unequal recombination that exchanges exons between genes, resulting in a gene with an additional exon and potentially new protein functions. Thus, option C is correct.
Explanation:
When two eukaryotic proteins share a common domain but are otherwise different, the most likely process that contributed to this similarity is exon shuffling. Exon shuffling occurs through unequal recombination events that allow for the exchange of exons, which are segments of DNA that encode for protein domains. Such recombination can result in a gene acquiring an additional exon from another gene, potentially leading to a protein with a new domain and function while still retaining other original functions. Since introns, which are non-coding regions of DNA, tend to be larger targets for mutations, they can act as a buffer, allowing exons to be shuffled without necessarily disrupting existing coding sequences. Thus, proteins from different evolutionary paths can have common structural features due to the movement and recombination of these exons.
Gene duplication alongside exon shuffling can also contribute to this phenomenon. Gene duplication allows for one copy of a gene to acquire new functions through mutation while the other retains its original function, further increasing species diversity. This combination of processes facilitates the rapid evolution of new proteins using pre-existing domains derived from other genes.
. Suppose that the CO2 concentration in theatmosphere
increased 100-fold. How would this affect the ability ofHb to
deliver O2 and why?
Answer:
Ability to deliver [tex]O_2[/tex] increases.
Explanation:
Carbon dioxide is transported by the blood in the dissolved form. carbonic anhydrase is the enzyme which is a metalloenzyme having zinc at active site converts carbon dioxide into carbonic acid which dissolves in the blood.
Thus,
H₂O (l) + CO₂ (g) ⇔ H⁺(aq) + HCO₃²⁻(aq)
If the concentration of the carbon dioxide is increases, then there is increase in the concentration of the hydrogen ions and thus decrease in the pH which results in the hemoglobin proteins releasing the uptake load of the oxygen. (Bohr effect)
Answer:
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Explanation: