Cells 1.2 Anatomy & Physiology

When the acetylcholine binds to the receptor sites __________.

• • a ligand is formed

• the sodium channels open

• • the sodium channels remain closed

• • sodium ions diffuse through and enter the cell

• • sodium ions diffuse through and leave the cell

When sodium ion channels open, sodium will always diffuse __________.

• • into the cell

• • out of the cell

• • up its own concentration gradient

• down its own concentration gradient

• • via facilitated diffusion

Which of the following represents the correct order of the phases of the cell cycle?

• • G1 -> G2 -> S -> M

• • G1 -> G2 -> M -> S

• G1 -> S -> G2 -> M

• • G1 -> S -> M -> G2

• • G1 -> M -> G2 -> S

During mitosis, the division of the cytoplasm is called __________.

• • synapsis

• • mitosis

• • meiosis

• cytokinesis

• • cytogenetics

Which of the following represents the correct order of the phases of mitosis?

• • prophase -> anaphase -> metaphase -> telophase

• prophase -> metaphase -> anaphase -> telophase

• • prophase -> metaphase -> telophase -> anaphase

• • metaphase -> prophase -> telophase -> anaphase

• • metaphase -> prophase -> anaphase -> telophase

Which of the following combinations are correctly matched?

• Ribosome—protein synthesis

• • Anticodon—mRNA

• • Codon—tRNA

• • Transcription—mRNA to protein

• • Translation—DNA to mRNA

Which of the following occurs as the ribosome shifts down the mRNA by a distance of one codon?

• • The tRNA that was in the A site picks up another amino acid.

• • The tRNA that was in the A site releases the growing polypeptide chain.

• The tRNA that was in the A site moves into the P site.

• • The tRNA that was in the P site moves into the A site.

• • The tRNA that was in the P site picks up another amino acid.

If a protein is 100 amino acids, during translation how many of these entered via the A site of the ribosome?

• 1

• 9

• 50

• 99

• 100

Where in the cell does transcription occur?

• • In the cytoplasm

• In the nucleus

• • In the Golgi apparatus

• • On ribosomes

What is the product of transcription?

• • DNA

• • tRNA

• mRNA

• rRNA