Receipt of extracellular signals can change cell behavior quickly (for example, in seconds or less) or much more slowly (for example, in hours)
A. What kind of molecular changes could cause quick changes in cell behavior?
B. What kind of molecular changes could cause slow changes in cell behavior?
C. Explain why the response you named in A results in a quick change, whereas the response you named in B results in a slow change.
A. Any answer that involves the modification of existing cell components is correct. Protein phosphorylation, protein dephosphorylation, protein ubiquitylation, lipid phosphorylation, and lipid cleavage are all examples of correct answers.
B. Responses that involve alterations in gene expression occur slowly.
C. Modification of existing cell components can happen quickly, whereas responses that depend on changes in gene expression take much longer, because the genes will need to be transcribed, the mRNAs will need to be translated, and the proteins need to accumulate to high-enough levels to instigate change.
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A plant that has the mutant form of the WEREWOLF gene (wer) would be identifiable by
A. the excessive number of vascular bundles in stem. B. the lack of fibers in the outer portions of the stem. C. the abundance of microscopic hairs on the root. D. the extra thick layer of mesophyll cells in the leaf. E. the lack of microscopic hairs along the epidermis of the root.
Triglycerides initially travel in the bloodstream away from the small intestine in ________ of the lymphatic system
Fill in the blank(s) with correct word
Which of the following would be considered household hazardous waste?
A- a plastic milk jug B- a can of spray paint C- an alkaline battery D- an aluminum can E- a tire
Why is external water not essential for fertilization in seed plants?
A. Pollen grains are transported by wind or an animal. B. Sperm cells are used to transport pollen to the archegonia. C. The sperm cells in seed plants are capable of resisting desiccation. D. Seed plants use pollen instead of sperm for fertilization. E. Ovules are contained within the pollen.