Chapter 6 Multiple choice Questions

. Light in the mammalian eye of perceived by rhodopsin. Which of the following best describes rhodopsin?

It is a receptor tyrosine kinase.

It is an ion channel, causing hyperpolarisation of the membrane.

It is a G protein coupled receptor.

It is a calcium ion pump.

. Signalling in the mammalian eye is mainly mediated by which of the following?

cAMP.

cGMP.

InsP₄.

InsP₃.

. Which of the following enzymes produces the superoxide anion?

Cytochrome c.

NADPH oxidase.

Caspase-9.

Lactate dehydrogenase.

. Which of the following is a mechanism used by plants to defend against pathogens?

Phagocytosis by neutrophils.

Production of antibodies by B cells.

Leaf greening response.

Hypersensitive Response.

. Which of the following are best known for the production of antibodies?

B cells.

Neutrophils.

Monocytes.

Macrophages.

. Which of the following is not an abiotic stress?

Presence of heavy metals

Temperature too high.

Presence of a bacterium.

Drought.

. Which of the following does D. discoideum use as a hunger signalling response?

cAMP.

cGMP.

InsP₄.

InsP₃.

. One of the first heterotrimeric G proteins to be discovered was which of the following?

G_s.

G_i.

G_t.

G_q.

. Which of the following viruses causes COVID-19?

SARS-CoV-2.

SARS-CoV-3.

SARS.

MERS.

. Which of the following types of protein best describes Heat Shock Proteins (HSPs)?

They are redox proteins.

They are dehydrogenases.

They are chaperone proteins.

They are proteases.

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