An initiator tRNA is loaded onto a small ribosomal subunit, which locates the start codon. What happens immediately following this event?
1.A new tRNA moves into the P site and the previous amino acid is transferred from its tRNA to the amino acid the new tRNA is carrying.
2.The anticodon of the initiator tRNA matches up with the mRNA start codon.
3.The new polypeptide chain is released from the ribosome.
4.The large ribosomal subunit joins to the small ribosomal subunit.
2
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A symporter is moving glucose and sodium levels are being depleted in extracellular fluids. What can be concluded about the movement of glucose? Choose all that apply.
_____ Glucose would be moving against its gradient into the cell _____ Glucose follows the gradient of sodium into the cell _____ Glucose would be moving with its gradient into the cell _____ ATP is not required to move sodium down its concentration gradient _____ Energy is needed to move glucose down its concentration gradient _____ Glucose's movement would still be considered diffusion _____ Glucose's movement is considered a part of coupled transport Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about coupled transport of glucose and sodium? What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Why are chytrid fungi of such keen research interest to biologists?
What will be an ideal response?
Double fertilization occurs when
a. one sperm unites with an egg and another sperm unites with the central cell of the female gametophyte. b. two sperm unite with one egg. c. two sperm unite with the central cell. d. one sperm unites with the egg and another sperm unites with the male gametophyte. e. one sperm unites with the egg and another sperm unites with a pollen grain.
Stroke is an interruption of blood flow to the lungs, which must have about 15% of the heart's output at rest.
a. true b. false