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BABS1201-Molecules, Cells and Genes T1 2025

BABS1201-Molecules, Cells and Genes T1 2025

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Some viruses have RNA as their genetic material. What type of bond joins the monomers of this nucleic acid together?

Phosphodiester

Glycosidic

Peptide

Ester

None, as RNA is single stranded.

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Which of the following is a monomer?

Alanine

Lactose

Phospholipid

Nucleic acid

Albumin

The following image of glucose transport by GLUT1 (glucose transporter 1) shows saturation at higher glucose concentrations. What does this infer about the nature of the carrier protein?

Facilitated diffusion, GLUT1 and glucose transport

The carrier protein has a limited number of binding sites.

The carrier protein can transport an unlimited amount of glucose.

The carrier protein is not specific to glucose.

The carrier protein requires ATP for glucose transport.

The carrier protein functions through simple diffusion.

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The molecule that forms membranes includes a two hydrophobic carbon chains joined to glycerol. Which bond joins these?

Ester

Peptide

Hydrogen

Phosphodiester

Glycosidic

When the lipase is synthesised in a cell which type of bond connects the monomers to form the polymer?

Peptide

Glycosidic

Phosphodiester

Hydrogen

Ester

Haemoglobin is comprised of four polypeptides that interact to produce a functional molecule. This type of interaction between polypeptides is best referred to as:

Quaternary structure

Tertiary structure

Secondary structure

Primary structure

Protein structure

What is the next step in this process?

Potassium pumped into cell, against its concentration gradient. Sodium-potassium pump

Potassium ions are released into the cell.

The binding of potassium ions changes shape of the protein and results in their release outside the cell.

The binding of potassium ions changes shape of the protein and results in sodium ions binding simultaneously.

Phosphorylation leads to a change in protein shape, reducing its affinity for potassium ions, which is released outside the cell.

The protein simultaneously picks up sodium ions and they dislodge the potassium ions inside the cell.

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Amino acids share a common structure that includes a/an:

Alpha amino group

Alpha helix

Aromatic ring

Peptide bond

Glycerol

When using the light microscope, to give a total magnification of 100X, if the ocular lens has a magnification of 10X the objective lens would need to be:

10X

100X

20X

90X

50X

You are observed eukaryote and bacterial cells with a microscope in the BABS1201 laboratory, but forgot to complete your Class Notebook! Which of the following can you write down with certainty the cells contained:

Cell membrane

Cell wall

Mitochondria

Nucleus

I have now learnt I need to complete the Class Notebook!

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