Which of the following organelles is not surrounded by a cellular membrane? A.Nu

Question

Which of the following organelles is not surrounded by a cellular membrane?

A.Nucleus

B.Ribosome

C.Endoplasmic reticulum

D.Lysosome

5.When ATP is synthesized aerobically using glucose, the majority of ATP is synthesized during which process?

A.Glycolysis

B.The citric acid cycle

C.Oxidative phosphorylation

D.Formation of lactate

6.During which phase of mitosis do the chromosome pairs move to opposite poles of the cell?

A.Prophase

B.Metaphase

C.Anaphase

D.Telophase

7.Which of the following cell-to-cell adhesion molecules allows rapid transmission of

electrical signals?

A.Desmosomes

B.Gap junctions

C.Tight junctions

D.Loose junctions

8.Which of the following transport proteins require energy?

A.Gap junctions

B.Channels

C.Carriers

D.Pumps

9.A cell will shrink when placed in which of the following solutions?

A.Hypertonic

B.Hypotonic

C.Isotonic

D. None of the Above

10.Which of the following terms correctly describes a chemical messenger secreted into

the blood?

A.Autocrine

B.Paracrine

C.Neurotransmitter

D.Hormone

11.A change in the resting membrane potential of a cell from –70 mV to –100 mV can be

described by which of the following terms?

A.Depolarization

B.Hyperpolarization

C.Repolarization

D.Negative polarization

12.Which ion flux is responsible for the depolarization phase of an action potential?

A.Opening of K+channels

B.Closing of K+channels

C.Opening of Na+ channels

D.Closing of Na+channels

13.Which ion flux is responsible for the release of neurotransmitter from the presynaptic

neuron?

A.Opening of Ca+channels

B.Opening of K+channels

C.Opening of Na+ channels

D.Closing of Na+channels

Explanation / Answer

Not surrounded by cellular membrane - ribosomes

5) oxidative phosphorylation

6) Anaphase

7) Gap junctions

8) Pumps

9) Hypertonic

10) Harmone

11) Hyperpolarisation

12) Opening of Na + channels

13) Opening of calcium channeld

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