Answer:
positive feedback (exacerbating feedback, self-reinforcing feedback) is a process that occurs in a feedback loop which exacerbates the effects of a small disturbance.
Answer:
False, it is only represented by one class: Crinoidea (sea lilies).
Explanation:
Echinoderms (phylum Echinodermata) are marine organisms that comprises more than 6,000 species. These animals are deuterostomes that are differentiated to have an ambulacral vascular system and a pentameric symmetry. Echinoderms are divided in the following classes: 1- Ophiuroidea (snake stars), 2-Asteroidea (sea stars), 3-Crinoidea (sea lilies), 4-Holothuroidea (sea cucumbers) and 5-Echinoidea (sea urchins), which can be easily distinguished by anatomical and ecological characteristics.
T
F
Answer:
the first option is true
b. gene expression
c. an operon
d. induction
Answer:
d. induction
Explanation:
A repressor is a protein capable of inhibiting target gene expression by binding to both operator sites and gene silencers. A DNA-binding repressor inhibits the interaction between the RNA polymerase and the DNA promoter sequence, thereby suppressing transcription into RNA. Moreover, the RNA-binding repressor is a protein that binds to the messenger RNA (mRNA) molecule in order to prevent its translation into protein. An inducer can start transcription by interacting with the repressor, thereby separating it from the DNA operator sequence.
B) During the Calvin cycle, carbon is oxidized.
C) ATP and NADPH produced by the light reactions are used by the Calvin cycle to make carbohydrates
D) The Calvin cycle breaks down carbohydrates into simpler molecules
Answer:
C) ATP and NADPH produced by the light reactions are used by the Calvin cycle to make carbohydrates
Explanation:
The light-dependent reactions of photosynthesis form ATP and NADPH. These reactions occur in the thylakoid membrane of chloroplasts.
The light-independent reactions of photosynthesis, the Calvin cycle occurs in the stroma of chloroplast as the enzymes for the reactions of the Calvin cycle are present in the stroma.
During the Calvin cycle, the atmospheric carbon dioxide is fixed into glucose using the ATP as an energy source and NADPH as the electron donor for redox reactions.
radioactive isotopes
special stains
high temperatures
Answer:
When viewing a specimen through a light microscope, scientists use special stains to distinguish the individual components of cells.
Explanation:
Microscope cell staining -
Microscope cell staining is a method that is used to for the better visualization of the cells and the parts of the cell , when are studied under microscope .
Stains are basically a type of biological tissues .
By the use of different type of stains , a nucleus of the cell or the cell wall of the cell are viewed easily , cells are sometimes stained in order to highlight metabolic process and can be used to find the difference between a dead or a live cell .
Some type of stains are specific for living cells , but some stains can work both for living as well as the non living cells .