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DEV2011 - Early human development from cells to tissues - S1 2025

DEV2011 - Early human development from cells to tissues - S1 2025

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Image failed to load: cell cycle2

Choose the CORRECT statement.

In G1 phase of the cell cycle:

Normal cell function halts

The cell doubles in size due to the presence of extra proteins and organelles

Cells spend the shortest period of time

Production of proteins that inhibit entry into S-phase increases

Chromosome condensation occurs

View this question

Image failed to load: cell cycle1

This image illustrates stages of the cell cycle.

Which statement is CORRECT?

The cycle typically lasts for 24 days

M phase is completed in about 1 – 2 days

G0 is a resting phase and occurs during G1

Metaphase occurs during S phase

Checkpoints occur only in M or G1 phase

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Checkpoints in the Cell Cycle rely upon the actions of:

Assembly or disassembly of microtubules

Cyclic fluctuations of estrogens and androgens

Synthesis of DNA with duplication of chromosomes

Cyclin proteins and enzymes called kinases

Cyclic rise and fall of cytokinesis

View this question

Image failed to load: cell cycle1

This image illustrates stages of the cell cycle.

Which statement is CORRECT?

The cycle typically lasts for 24 days

M phase is completed in about 1 – 2 days

G0 is a resting phase and occurs during G1

Metaphase occurs during S phase

Checkpoints occur only in M or G1 phase

View this question

Image failed to load: cell cycle2

Choose the CORRECT statement.

In G1 phase of the cell cycle:

Normal cell function halts

The cell doubles in size due to the presence of extra proteins and organelles

Cells spend the shortest period of time

Production of proteins that inhibit entry into S-phase increases

Chromosome condensation occurs

View this question

Which of the following statements are true:

Sperm become hyperactive prior to their release into the vagina

Uterine muscle contractions are critical in getting the sperm into the oviduct

Sperm capacitation holds sperm up in the cumulus matrix preventing them from reaching the egg

Fertilisation occurs primarily in the cervical epithelium of the female reproductive tract

All of the above are correct

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Which statement is not related to the acrosome reaction:

Exocytosis results in the release of various proteolytic enzymes

Fusion occurs between the acrosomal vesicle and the sperm membrane

Capacitation of sperm and penetration through the cumulus of the egg occurs only after the acrosome reaction

Sperm undergo the acrosome reaction only after having resided in the female reproductive tract for some time

Digestion of the egg’s zona pellucida occurs via proteases released from the acrosome

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Following early cleavage in the chicken, continued cell divisions will give rise to an embryo called a _______.

Blastocoel

Blastocyst

Blastodisc

Blastomere

Blastula

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Which of the following statements relating to gastrulation is CORRECT?

Choose the CORRECT option below:

Cells that undergo gastrulation form the germ cell lineage

Cells that migrate through the primitive streak to displace the hypoblast become ectoderm

Cells that move through the primitive streak to the mid-layer form mesoderm

Cells that remain in the epiblast layer become endoderm

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At which phase of the cell cycle can you perform a karyotype analysis?

Choose the CORRECT option below:

Anaphase

Telophase

Prophase

Metaphase

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