Answer: D (It involves carrier-mediated transport).
Explanation:
Tubular reabsorption transports nutrients back into the blood. Tubular reabsorption of nutrients such as sodium, glucose, lactate amino acids, and other organic substances occurs via carrier membrane proteins to the proximal tubule.
Most of the substances that are reabsorbed via the proximal tubule require the use of carrier membrane proteins, for facilitated diffusion, active transport and secondary active transport.
Example of secondary active transport is the sodium-dependent glucose cotranspoter.
Answer:
ecosystem ecology
Explanation:
The ecosystem is the basic unit for supporting life, but an ecosystem goes beyond organisms living in one place. Life depends on the recycling of resources between organisms and the environment in which they live, between organic and inorganic forms. Ecosystem ecology studies these transformations and integrates into both terrestrial and aquatic ecosystems, attracting fields as diverse as atmospheric chemistry, hydrology, soil science, physiology, and ecology.
For this reason, The study of nutrient cycling through the environment is an example of subjects that are studied in ecosystem ecology.
Answer: Option A.
Pure solvent diffused through a membrane but solutes do not.
Explanation:
Osmosis is process where solvents or molecules move from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane which tend to balance the concentration of solutes. Osmosis is passive transport i.e it does not require energy for movement.
Answer:
The correct answer would be 5' capping, 3' polyadenylation , and intron splicing.
In eukaryotes, transcription results in the formation of pre-mRNA which needs to be processed in order to become mRNA (messenger ribonucleotide).
The pre-mRNA processing include:
- Addition of 5'cap (usually modified guanine nucleotide) at the 5'-end of the RNA. It prevents the RNA degradation and also help in the attachment of ribosome for translation.
- Addition poly-adenine (poly-A) tail at the 3'-end of the RNA. It increases the stability of the RNA and helps in its export out of the nucleus.
- Lastly, splicing takes place which removes the introns and joins the exons. Alternative splicing can also take place in order to produce many mRNA from a single gene.
