Answer:
To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells.
Explanation:
A night person is more active and awake at night whilst a morning person is the opposite.
Answer:
D. archaeal membranes contain L-glycerol.
Explanation:
Archaea and eubacteria differ from each other with respect to the nature of membrane lipids. Lipids present in the membranes of the archaeans have the hydrocarbons derived from isoprene units. These hydrocarbons are branched and are attached to the glycerol with help of ether linkage. Ester linkages are present in eubacteria. The glycerol present in the archaeans is L- glycerol. Bacterial membranes have D-glycerol present in their lipids.
An Intron is a part of DNA that does not code for a functional protein
The requirements for sexual reproduction, is that the species has both a Male and Female gender if they are both this also still applies as long as they don't breed with themselves.Sexual reproduction helps prevent disfigurements, that can end up killing an entire generation of animals and also can lead to a species adapting to environments faster.
