What is wafting?O
A. Gently pushing vapors toward your nose
B. Dipping your nose into a liquid
O
C. Inhaling deeply with your nose
D. Putting your nose in a jar of chemicals​

The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell.For example, consider these two proteins:1. Phosphofructokinase (PFK) is an enzyme that functions in the cytoplasm duringglycolysis.2. Insulin, a protein that regulates blood sugar levels, is secreted from specializedpancreatic cells.Assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations.For each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (Note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)Options:Cytoplasm only, ER --> cytoplasm, ER --> Golgi --> outside cell, cytoplasm --> ER --> outside cell, Golgi --> ER --> outside cell, cytoplasm --> Golgi --> outside cell, nucleus --> cytoplasm, ER --> Golgi --> cytoplasm

Keystone SpeciesA keystone species is one whose presence contributes to the diversity of life and whose
extinction would lead to the extinction of other forms of life. A keystone species helps to
support the ecosystem of which it is a part.
An example of what can happen when a keystone species is removed occurred when fur
hunters eliminated sea otters from some Pacific Ocean kelp beds. Otters eat sea urchins,
which eat kelp. With its major predator gone, sea urchin populations exploded and
consumed most of the kelp. Fish, snails, and other animals associated with the kelp beds
disappeared.
The grizzly bear is another example of a keystone species. Grizzlies transfer nutrients
from the ocean ecosystem to the forest ecosystem. The first stage of this transfer is
performed by salmon that swim up rivers, sometimes for hundreds of miles. Salmon are rich
in nitrogen, sulfur, carbon, and phosphorus. The bears capture the salmon and carry them
onto dry land, scattering nutrient-rich feces (wastes) and partially eaten salmon carcasses.
It has been estimated that the bears leave up to half of the salmon they harvest on the
forest floor.

Which sequence best represents the feeding relationships in a kelp ecosystem that has not been disturbed
by humans?
(1) sea urchins → kelp → fish (3) kelp → sea otters → sea urchins
(2) kelp → sea urchins → sea otters (4) sea urchins → snails → kelp

which of the following is the correct sequence of the zones in the primary growth of a root, moving from the root cap inward?

Compare and contrast biotic and abiotic factors

Question 1 All living organisms contain carbon atoms. Which of the following is an important characteristic of carbon?

Question 1 options:

Carbon atoms are highly reactive and form unstable bonds with any available atom.


Carbon atoms can bond with any other atom, but they cannot form bonds with other carbon atoms


Carbon atoms are very stable and do not easily form bonds with other atoms


Carbon atoms can bond with many other kinds of atoms to form very stable molecules.



Question 2
Any chemical that contains carbon bonded to at least one other atom, usually hydrogen, is known as a

Question 2 options:

Carbohydrate


Fatty Acid


Organic Molecule




Question 3
How many valence electrons are generally needed to fill the outer shell of most atoms?

Question 3 options:

4


6


8



Question 4
The macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. What main elements do all of have in common?

Question 4 options:

Carbon and Sulfur


Carbon and Hydrogen


Oxygen and Nitrogen


Oxygen and Phosphorus

Are living systems governed by the same principles of chemistry and physics that govern non-living systems?