Biology Questions

eptiles kept in captivity such as lizards and snakes usually need heat lamps on their cages so that they eat enough to maintain a good body weight How is the cage temperature related to the amount of food they eat Why doesn t a hamster need heat lamp

the following organs is incorrectly paired with its function stomach protein digestion oral cavity starch digestion Osmall intestine nutrient absorption Olarge intestine bile production Opancreas enzyme production Question 25 1 point Listen Which of the following digestive structures are NOT part of the digestiv tube alimentary canal through which food moves Select all that apply

ain how the small intestine has such a large internal surface area even though t takes up only a relatively small portion of the body cavity Why is surface are important for this organ

Which of the following digestive structures are NOT part of the digestive tube alimentary canal through which food moves Select all that apply esophagus trachea Oliver small intestine gall bladder Question 26 3 points

Listen point Salivary amylase digests monosaccharides O glucose Ostarches O maltose O protein

The absorption of fats differs from that of carbohydrates in that the processing of fats does not require any digestive enzymes whereas the processing of carbohydrates does fats but not carbohydrates are digested by bacteria before absorption most absorbed fat first enters the lymphatic system whereas carbohydrates directly enter the blood O fat absorption occurs in the stomach whereas carbohydrates are absorbed the small intestine carbohydrates need to be emulsified before they can be digested where do not

O stive secretions with a pH of 2 are characteristic of the pancreas Ostomach small intestine liver mouth Question 22 1 point Listen

ws show materials flowing into one structure where these fut Why the name of the structure gall bladder stomach Oliver Oduodenum

the body passes through the structures of the digestive system the following correctly represents the order in which food coming into Opharynx small intestine large intestine stomach esophagus stomach small intestine large intestine esophagus stomach pharynx small intestine O pharynx stomach esophagus small intestine Question 17 1 point Listen When theo dedi

etary substances must cross cell membranes to be used by the body a process known as digestion elimination ingestion hydrolysis O absorption Question 21 1 point Listen Digestive secretions with an of

Pepsin is a digestive enzyme that Ois denatured and rendered inactive in solutions with low pH Ois manufactured by the pancreas Obegins the hydrolysis of proteins in the stomach helps stabilize fat water emulsions Osplits maltose into monosaccharides Question 19 1 point Listen T

In the legs of Canada geese counter current exchange is occurring Which two substances are moving opposite one another Oblood in veins and blood in arteries Oblood in arteries and oxygen Oheat in veins and heat in arteries Oblood in arteries and blood in capillaries Oblood in veins and interstitial fluid Question 8 1 point

stomach achea and esophagus both connect to the small intestine Opharynx Olarge intestine Orectum Question 16 1 point 4 Listen

A mouse compared to an elephant has a lower metabolic rate per gram a larger surface area to volume ratio more rapid heat loss from the body surface little ability to maintain homeostasis a higher heart rate Question 13 1 point

a typical nerve cell the nucleus is found in the Ocell body O synapse axonal region dendritic region synaptic terminals Question 11 1 point B

Which tissue type in the body contains cells with the unique ability to shorten adipose tissue epithelial tissue nervous tissue O connective tissue muscle tissue O Question 12 1 point Listen A mouse compared to an elephant has

The nourishment insulation and support for neurons is the result of activity by the intercalated disks endocrine system adipose tissue Oglial cells smooth muscles Question 10 1 point Listen

Panting by an overheated dog achieves cooling by evaporation shivering thermogenesis torpor O acclimatization nonshivering thermogenesis Question 9 1 point

size increases in animals Omigration to tropical areas becomes necessary for thermoregulation there is greater variability in metabolic rate it becomes easier to conserve body warmth in cold environments reproduction becomes limited to terrestrial environments there is an increase in the surface area to volume ratio Question 6 1 point Listen

As body size decreases in animals there is greater variability in metabolic rate Oit becomes easier to conserve body warmth in cold environments migration to tropical areas becomes necessary for thermoregulation digested food Othere is an increase in the surface area to volume ratio reproduction becomes limited to terrestrial environments Question 5 1 point Listen

Listen How do the microvilli on the absorptive epithelia of the small intestine enhance nutrient absorption Othey help protect the intestinal lining from abrasion Othey pump wastes into the lumen while pumping nutrients toward the blood they contain thick and thin filaments to help absorb molecules they move back and forth to keep food moving in the digestive tract they have a large amount of surface area that is in contact with digested food

ase the effectiveness of exchange surfaces lining the lungs and the intestines evolutionary pressures have increased the volume of the cells in these linings increased the number of cell layers in these linings increased the exchange surface area with folds and branches increased the thickness of the membranes in these linings decreased the metabolic rate of the cells in these linings Question 3 1 point

This drug in the picture can treat Fever Epilepsy Cancer arrhythmia HO N N

FRET was used to study the interaction between 2 molecules Fluorophores used were Cyan Fluorescent Protein CFP and Yellow Fluorescent Protein YFP CFP absorbs 430nm light and emits 500nm light YFP absorbs 500nm light and emits 580nm light The molecule onto which CFP binds to can act as O Fluorescent donor O Both as fluorescent donor and acceptor O Fluorescent acceptor It does not give off any fluorescence

More Positive Double the concentration of K outside the cell Double the number of K leak channels Decrease the concentration of Nat outside the cell by half More Negative Double the number of closed channels for K Double the size of the cell without adding channels Largely Unchanged Triple the number of Nat leal channels

Match the words in the left column to the appropriate phrases on the right Make certain each word is matched with a phrase before submitting your answer View Available Hint s K permeability Membrane potential of 90 mV Membrane potential of 70 mV The resting membrane potential of the cell The primary determinant of the resting membrane potential The point at which there is no net movement of K into or out of the cell Reset Help Nat permeability Although it plays a role it is not a primary determinant of the resting membrane potential

The adult brain regions consist of all of the following except neural tube diencephalon cerebral hemispheres cerebellum brain stem

Match the area of the brain with its function 100 thalamus cerebral cortex cerebellum medulla oblongata 1 2 3 4 fine tunes motor activity to provide precise coordinated movements autonomic reflex center involved in maintaining homeostasis relay station for information coming into the cortex executive suite of the brain responsible for conscious thought sensory perception and control of skeletal muscle movement

the available space True False Question 2 1 point 4 Listen The adult brain regions consist of all of the following except neural tube diencephalon cerebral hemispheres ng membranous skull so it must fold to occupy abollum

Which area of the brain is crucial in regulating homeostasis hypothalamus cerebellum thalamus

are incoming short distance signals on dendrites or the cell body vs outgoing long distance signals on axons Presynaptic potentials postsynaptic potentials Action potentials graded potentials EPSP IPSP Graded potentials action potentials are

If a neurotransmitter binding to its receptor opens Cl channels which of the following would occur an EPSP an action potential presynaptic inhibition an IPSD

Match the glial cells to their correct description Small ovoid cells that can transform into macrophages to phagocytize microorganisms and debris 10 Versatile star shaped cells that support and brace neurons and control the permeability of capillaries in the CNS Surround neuron cell bodies in the PNS Cells that line the central cavities of the brain and spinal cord Form myelin sheaths are thicker nerve fibers in the CNS Form myelin sheaths around thicker nerve fibers 1 Astrocytes 2 Microglial cells 3 Ependymal cells 4 Oligodendrocytes 5 Satellite cells 6 Schwann cells

Neurons can potentially live and function optimally for 100 years or more True False

True False Question 3 1 point 4 Listen are incoming short distance signals on dendrites or the cell body vs outgoing long distance signals on axons Graded potentials action potentials Presynaptic potentials postsynaptic potentials EPSP IPSP are

Match the glial cells to their correct description Form myelin sheaths are thicker nerve fibers in the CNS Cells that line the central cavities of the brain and spinal cord Versatile star shaped cells that support and brace neurons and control the 2 Microglial cells permeability of capillaries in 3 Ependymal cells the CNS 4 Oligodendrocytes 5 1 Astrocytes Small ovoid cells that can transform into macrophages to Satellite cells phagocytize microorganisms and debris 6 Schwann cells Form myelin sheaths around thicker nerve fibers in the PNS Surround neuron cell bodies in the PNS

The function of a neurotransmitter is determined by the receptor to which it binds True False

When input travels along one pathway to a specific destination and produces a specific anticipated response that is a reverberating circuit parallel processing a simple neuronal pool serial processing

following would occur an EPSP presynaptic inhibition an IPSP an action potential Question 7 1 point Listen to its receptor opens Cl channels which of the The function of a neurotransmitter is determined by the receptor to which it binds True

the frequency of action potentials the duration of the action potentials the speed of the action potentials the strength of the action potentials Question 5 1 point Listen Multiple Sclerosis affects which of the following the generation of action potentials Osaltatory conduction continuous conduction by what

Researchers found a strain of E coli bacteria that had mutation rates one hundred times higher than normal Which of the following statements correctly describes the most likely cause of these results There were one or more base pair mismatches in the RNA primer The DNA polymerase was unable to add bases to the 3 end of the growing nucleic acid chain The proofreading mechanism of DNA polymerase was not working properly The single strand binding proteins were malfunctioning during DNA replication

How is plant cell cytokinesis different from animal cell cytokinesis The contractile filaments found in plant cells are structures composed of carbohydrates the cleavage furrow in animal cells is composed of contractile proteins Plant cells divide after metaphase but before anaphase animal cells divide after anaphase The structural proteins of plant cells separate the two cells in animal cells a cell membrane separates the two daughter cells Plant cells deposit vesicles containing cell wall building blocks on the metaphase plate animal cells form a cleavage furrow

A black guinea pig crossed with a guinea pig with albinism produced 12 black offspring When the albino was crossed with a second black animal six blacks and six albinos were obtained What is the best explanation for this genetic situation Albinism is a dominant trait black is incompletely dominant Albinism is a recessive trait black is codominant Albinism and black are codominant Albinism is a recessive trait black is a dominant trait

Most repressor proteins are allosteric Which of the following molecules binds with the repressor to alter its conformation and therefore affect its function O promoter CAMP transcription factor

Starting with a fertilized egg zygote a series of six cell divisions would produce an early embryo with how many cells 32 12 16 64

Albinism is a recessive trait A man and woman both show normal pigmentation but both have one parent who has albinism without melanin pigmentation What is the probability that their first child will have albinism 01 1 2 1 4

When taken up by a cell which of the following molecules binds to a repressor so that the repressor no longer binds to the operator Opromoter Orepressor Ocorepressor

What is meant by the description antiparallel regarding the two strands that make up the DNA double helix The double helix structure of DNA creates nonparallel strands Base pairings create unequal spacing between the two DNA strands One strand contains only purines and the other contains only pyrimidines The 5 to 3 direction of one strand runs counter to the 5 to 3 direction of the other strand

In yeast signal transduction a yeast cell releases a mating factor which diffuses through the membranes of distant cells causing them to produce factors that initiate long distance migrations binds to receptors on the membranes of other types of yeast cells acts back on the same cell that secreted the mating factor changing its development passes through the membranes of neighboring cells binds to DNA and initiates transcription

Not all intercellular signals require transduction Which one of the following signals would be processed without transduction a signal that is weakly bound to a nucleotide a lipid soluble signal a signal that binds to a receptor in the cell membrane a signal that binds to the extracellular matrix