can u please tell me the answers 1= If a cross section of a herbaceous plant ste
ID: 167794 • Letter: C
Question
can u please tell me the answers
1= If a cross section of a herbaceous plant stem were compared with the cross section of its root, how would they differ?
A) Location of vascular tissue. (Ans)
B) Location of dermal tissue.
C) Location of terminal buds.
D) Location of ground tissue.
2= Compare the leakage rates of sodium and potassium into and out of a neuron at rest. How is the relationship between these rates best described?
A) Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron.
B) Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron.
C) Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron.
D) Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron.
E) Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron.
3= Identify the key feature of the action potential that ensures it will travel only one direction.
A) the temporary cessa tion in activity of the Na+/K+ pump
B) the activation state of the voltage - gated K+ channel
C) the activation state of the voltage - gated Na+ channel
D) the inactivation state of the voltage - gated K+ channel
E) the inactivation state of the voltage - gated Na + channel
4= The class of neurotransmitters that most commonly act as modulators of postsynaptic cell responses are the
A) biogenic amines.
B) gases such as nitric oxide.
C) acetylcholine.
D) amino acids.
E) neuropeptides.
5= The ability to determine where a sound is coming from depends primarily on
A) differences in both frequency and intensity at the two ears.
B) differences in time of sound arrival to the two ears.
C) differences in sound intensity in the two ears.
D) differences in sound frequency received at the two ears.
E) None of these choices are correct.
6= Within the vestibular system of vertebrates, hair cells help detect linear movement when their cilia are bent by
A) the basilar membrane.
B) statoliths.
C) gravity.
D) the tectorial membrane.
E) otoliths.
7= Odor molecule receptors are located on the ________ extending from olfactory receptor cells in the human nose.
A) synapse
B) oligodendrocyte
C) axon
D) cilia
E) soma
8= Which of the following are NOT critical for the function of chemical synapses?
A) Gap junctions.
B) Voltage gated calcium channels.
C) Synaptic vessicles.
D) Neurotransmitters.
E) All of the listed elements are critical for function of chemical synapses.
9= The correct sequence for a sound (a vibration) traveling into the mammalian ear would be listed as
A) tympanum, ossicles of middle ear, oval window, basilar membrane, hair cell, sensory nerve.
B) hair cell, pinna, basilar membrane, ossicles of middle ear, tympanum, oval window
C) tympanum, pinna, ossicles of middle ear, hair cell, oval window, basilar membrane
D) pinna, oval window, tympanum, basilar membrane, ossicles of middle ear, hair cell
E) pinna, ossicles of middle ear, tympanum, basilar membrane, oval window, hair cell
10= The mesophyll of the leaf
A) is made up of palisade and spongy parenchyma cells.
B) is mostly along the edges of the leaf.
C) is located between the leaf veins.
D) is exposed to direct sunlight.
E) is sometimes found in roots or stems
Explanation / Answer
Answer 1(a) herbaceous plants stems and roots differ in location of vascular tissues.in stems, vascular tissues are arranged in bundles whereas, in roots tissues are arranged in centre i.e. forms the core.
Answer 2(E) Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron. during resting membrane potential, neuronal membrane is more permeable to potassium ions and impermeable to sodium ion.thus negative charge develops outside.
Answer 3(E) the inactivation state of the voltage - gated Na + channel ensures unidirectional flow of action potential becuase it maintains refractory period in which polarisation of membrane occurs after some time.
Answer 4(C) Acetylcholine acts on postsynaptic cells.
Answer 5(B) differences in time of sound arrival to the two ears.it is also called interaural time difference.
Answer 6(A) the basilar membrane.
Answer 7(D) cilia.
Answer 8(A) GAP junctions are found in electrical synapse whereas in chemical synapse neuromascular junctions are involved.
Answer 9(A) pinna collects sounds transfer it to tympanum then to ear ossicle from there to oval window to basilar membrane to hair cell to nerve.
Answer 10(A) is made up of palisade and spongy parenchyma cells.
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