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If the sequence of bases on the mRNA codon is AUU, what would be the sequence of bases on the opposite strand assembled by the tRNA?(1 point)

Responses

UAA
UAA

ATT
ATT

TAA
TAA

UUA
UUA

9 answers

The mRNA codon sequence AUU pairs with the tRNA anticodon. The anticodon is complementary to the codon. To find the anticodon, we need to determine the corresponding bases:

  • A (Adenine) pairs with U (Uracil in RNA)
  • U (Uracil) pairs with A (Adenine)
  • U (Uracil) pairs with A (Adenine)

So, the tRNA anticodon for the mRNA codon AUU would be UAA.

Therefore, the correct response is:

UAA

Which of the following correctly shows the sequence of organelles a protein would take if it were being exported from the cell?(1 point)
Responses

Smooth ER →
Vesicle →
Golgi apparatus →
Rough ER →
Vesicle →
Nucleus
Smooth ER right arrow Vesicle right arrow Golgi apparatus right arrow Rough ER right arrow Vesicle right arrow Nucleus

Ribosome →
Smooth ER →
Vesicle →
Cell Membrane →
Vesicle →
Rough ER
Ribosome right arrow Smooth ER right arrow Vesicle right arrow Cell Membrane right arrow Vesicle right arrow Rough ER

Ribosome →
Rough ER →
Vesicle →
Golgi Apparatus →
Vesicle →
Cell Membrane
Ribosome right arrow Rough ER right arrow Vesicle right arrow Golgi Apparatus right arrow Vesicle right arrow Cell Membrane

Ribosome →
Vesicle →
Rough ER →
Vesicle →
Golgi Apparatus →
Cell Membrane

To export a protein from the cell, the correct sequence of organelles and structures involved in the protein's transport would generally be:

  1. Ribosome - where the protein is synthesized (either free or attached to the Rough ER).
  2. Rough ER - where the newly synthesized protein enters for post-translational modifications and folding.
  3. Vesicle - transports the protein from the Rough ER to the Golgi apparatus.
  4. Golgi Apparatus - where further modifications, sorting, and packaging of the protein occur.
  5. Vesicle - transports the protein from the Golgi apparatus to the cell membrane.
  6. Cell Membrane - where the protein is secreted or integrated into the membrane.

The correct option that reflects this order is:

Ribosome → Rough ER → Vesicle → Golgi Apparatus → Vesicle → Cell Membrane

So, the correct response is:

Ribosome → Rough ER → Vesicle → Golgi Apparatus → Vesicle → Cell Membrane

Proteins are important molecules that are synthesized, transported, and used in cells in a multitude of ways. The rough endoplasmic reticulum and Golgi apparatus have parts to play in this system. These functions are __________, respectively.

Identify the answer choice that correctly fills in the blank in the above passage.

(1 point)
Responses

protein making and protein packaging
protein making and protein packaging

DNA packaging and DNA storing
DNA packaging and DNA storing

protein packaging and lipid production
protein packaging and lipid production

DNA making and DNA packaging

The rough endoplasmic reticulum (Rough ER) is primarily involved in protein synthesis, as it is studded with ribosomes that translate mRNA into polypeptide chains. The Golgi apparatus, on the other hand, is responsible for packaging and modifying proteins for transport to their final destinations, whether inside or outside the cell.

Therefore, the correct answer choice that fills in the blanks in the passage is:

protein making and protein packaging.

n which part of the cell do ribosomes perform protein synthesis?(1 point)
Responses

lysosome
lysosome

vacuole
vacuole

nucleus
nucleus

cytoplasm

Ribosomes perform protein synthesis primarily in the cytoplasm. They can be found either free-floating in the cytoplasm or attached to the rough endoplasmic reticulum (Rough ER), where they synthesize proteins that are either secreted from the cell or sent to the cell’s membranes and organelles.

Therefore, the correct response is:

cytoplasm.

What would happen to a cell that lacked smooth endoplasmic reticulum?(1 point)
Responses

It would not be able to replicate DNA.
It would not be able to replicate DNA.

It would not be able to make lipids.
It would not be able to make lipids.

It would not be able to produce tRNA.
It would not be able to produce tRNA.

Its cell membrane would be impermeable.

The smooth endoplasmic reticulum (smooth ER) is primarily involved in the synthesis of lipids, metabolism of carbohydrates, detoxification of drugs and poisons, and storage of calcium ions. If a cell lacked smooth endoplasmic reticulum, one of the main consequences would be an inability to synthesize lipids.

Therefore, the correct response is:

It would not be able to make lipids.