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14 May 2018

Consider an endothermic animal that has been fasting (and so is post- absorptive), is at rest, and at its typical body temperature. Normally, under these conditions, the metabolic rate of the animal is measured to be 35 mL O2/minute. However, a recent study has shown that under certain conditions that decrease the half-life of proteins in the body, the metabolic rate of the animal is 45 mL O2/minute. Provide a reasonable explanation for the increase in metabolic rate in the new environment.

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14 May 2018

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Related questions

11. Which of the following is an attribute of a scientifically literate person?

A. Creates templates for understanding

B. Constructs hypothetical arguments for discussion

C. Respects the rights of self determination

D. Uses scientific evidence to understand the natural world

E. Reports on social phenomena consistently

12. Which of the following does not contribute to the Calorie intake of a person?

A. Protein

B. Carbohydrate

C. Fat

D. Alcohol

E. Water

13. Which of the following is not a technique used to measure body composition?

A. Skin-fold calipers

B. Bod PodÃ

C. Body mass index

D. Hydrostatic weighing

E. Light absorption technique

14. Which of the following behavioral techniques supports healthy body weight changes?

A. Feasting

B. Fasting

C. Goal setting and a plan

D. Eating vegetables and meat

E. Regularly measuring body composition

15. The purpose of the warm-up is to:

A. Slowly increase the pulse rate to an aerobic level.

B. Facilitate vascular changes (splenic shunt) to accommodate aerobic exercise.

C. Gear up the energy metabolism, i.e., increase the delivery of oxygen and nutrients to the working muscle, and raise the temperature to an optimal level for energy production.

D. Increase the elasticity of the muscle fibers, which helps to prevent muscle, tendon, ligament, and joint injuries, as well as improve muscle contraction and preserve muscle glycogen in addition to reducing the amount of lactic acid build-up in the muscles.

E. All of the above

16. Which of the following reflects an improvement in cardiovascular health resulting from regular engagement in aerobic exercise?

A. Increased lean body mass

B. Increase in high-density lipoprotein cholesterol (HDL)

C. Stress relief

D. Improvement in sleep pattern

E. Reduced risk for developing certain types of cancer

17. The purpose of a cool-down is to:

A. slowly decrease pulse rate.

B. decrease core body temperature.

C. slowly constrict blood vessels.

D. continue adequate supply of blood to the brain, and facilitate removal of metabolic waste products from the muscles.

E. All of the above

18. A person trying to gain lean body mass has:

A. increased fluid needs.

B. decreased fat needs.

C. altered fitness needs.

D. increased protein and strength training needs.

E. decreased electrolyte needs.

19. Vitamin A in the form of _____ is used to treat acne.

A. retinol

B. retinal

C. retinoic acid

D. beta-carotene

E. lycopene

20. Which of the following is a genetic disease for which a low intake of copper is a component of treatment?

A. Pellagra

B. Wilsonâs disease

C. Hemochromatosis

D. Beriberi

E. Goiter

21. Which of the following nutrients is used to treat scurvy?

A. Folate

B. Riboflavin

C. Vitamin C

D. Niacin

E. Vitamin D

22. Which of the following groups is at highest risk for hemolytic anemia?

A. Premature infants

B. Elderly people who do not get exposure to sunlight

C. Pregnant women

D. Teenagers who do not drink enough water

E. Someone who does not consume animal meat or products

23. Iron deficiency causes:

A. microcytic normochromic anemia.

B. macrocytic hypochromic anemia.

C. microcytic hypochromic anemia.

D. macrocytic normochromic anemia.

E. macrocytic hyperchromic anemia.

24. Acrodermatitis enteropathica is caused by a deficiency of:

A. iron.

B. zinc.

C. chromium.

D. choline.

E. molybdenum.

25. Which of the following is required for the absorption of vitamin B₁₂?

A. A coenzyme

B. Intrinsic factor

C. Vitamin C

D. Bile acids

E. None of the above

26. Which nutrient potentiates the action of insulin?

A. Magnesium

B. Fluoride

C. Chromium

D. Selenium

E. Iodine

27. Which mineral is a central component of vitamin B₁₂?

A. Iron

B. Copper

C. Cobalt

D. Zinc

E. Molybdenum

28. Iodine is a component of:

A. hemoglobin.

B. myoglobin.

C. intrinsic factor.

D. insulin.

E. thyroxine.

29. Which of the following statements is not true regarding the diagnosis of a nutritional deficiency?

A. Dietary records should demonstrate low intake for that nutrient.

B. Blood levels should demonstrate high body levels of the nutrient.

C. Tissue levels should demonstrate low body levels of the nutrient.

D. Nutrient supplementation should correct the deficiency symptoms.

E. Clinical deficiency symptoms should be compatible with a low dietary intake.

30. Vitamin C helps maintain tissue integrity by:

A. neutralizing foreign proteins.

B. creating an alkaline cell environment.

C. recognizing cell boundaries.

D. forming collagen to bind cells together.

E. increasing inflammation

oliveplatypus662

__________ are fairly small organelles that provide a safe place within the cell to carry out certain biochemical reactions that generate harmful, highly reactive oxygen species. These chemicals are both generated and broken down in the same location.

Lysosomes

Endosomes

Peroxisomes

Nucleosomes

Biologists cannot possibly study all living species. Instead, they try to understand cell behavior by studying a select subset of them. Which of the following characteristics are useful in an organism chosen for use as a model in laboratory studies?

rapid rate of reproduction

all of the above

ability to grow under controlled conditions

amenability to genetic manipulation

By definition, prokaryotic cells do not possess __________.

ribosomes.

a nucleus.

membrane bilayers.

replication machinery.

Cell biologists employ targeted fluorescent dyes or modified fluorescent proteins in both standard fluorescence microscopy and confocal microscopy to observe specific details in the cell. Even though fluorescence permits better visualization, the resolving power is essentially the same as that of a standard light microscope because the resolving power of a microscope is limited by the __________ of light.

intensity

absorption

wavelength

filtering

Choose the phrase that best completes this sentence: Microtubules ____________ and are required to pull duplicated chromosomes to opposite poles of dividing cells.

generate contractile forces

can rapidly reorganize

are found in especially large numbers in muscle cells

are intermediate in thickness

Despite the differences between eukaryotic and prokaryotic cells, prokaryotes have proteins that are distantly related to eukaryotic actin filaments and microtubules. What is likely to be the most ancient function of the cytoskeleton?

cell division

cell motility

vesicle transport

membrane support

DNA and RNA are different types of nucleic acid polymer. Which of the following is true of DNA but not true of RNA?

It contains thymine.

It has 5'-to-3' directionality.

It is single-stranded.

It contains uracil.

Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________.

prevent additional bonds from being formed with the bonded atoms.

limit the rotation of the bonded atoms.

create a new arrangement of electron shells.

change the reactivity of the bonded atoms.

Drosophila melanogaster is a/an __________. This type of animal is the most abundant of all animal species, making it an appropriate choice as an experimental model.

mammal

amphibian

bird

insect

10.

If the isotope 32S has 16 protons and 16 neutrons, how many protons, neutrons, and electrons will the isotope 35S have, respectively?

16, 19, 17

16, 19, 15

16, 19, 16

16, 20, 15

11.

Living systems are incredibly diverse in size, shape, environment, and behavior. It is estimated that there are between 10 million and 100 million different species. Despite this wide variety of organisms, it remains difficult to define what it means to say something is alive. Which of the following can be described as the smallest living unit?

cell

organelle

protein

DNA

12.

Macromolecules in the cell can often interact transiently as a result of noncovalent interactions. These weak interactions also produce stable, highly specific interactions between molecules. Which of the factors below is the most significant in determining whether the interaction will be transient or stable?

the concentration of each molecule

the size of each molecule

surface complementarity between molecules

the rate of synthesis

13.

Many of the mechanisms that cells use for maintenance and reproduction were first studied at the molecular level in bacteria. Which bacterial species had a central role in advancing the field of molecular biology?

E. coli

S. pombe

C. elegans

D. melanogaster

14.

Many types of cells have stores of lipids in their cytoplasm, usually seen as fat droplets. What is the lipid most commonly found in these droplets?

cholesterol

isoprene

triacylglycerol

palmitic acid

15.

Mitochondria contain their own genome, are able to duplicate, and actually divide on a different time line from the rest of the cell. Nevertheless, mitochondria cannot function for long when isolated from the cell because they are __________________.

anaerobes.

viruses.

parasites.

endosymbionts.

16.

Mitochondria perform cellular respiration, a process that uses oxygen, generates carbon dioxide, and produces chemical energy for the cell. Which answer below indicates a correct pairing of material âburnedâ and the form of energy produced during cellular respiration?

17.

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. Which one of these molecules contains polar bonds?

Case Study

Skolnikland is in Eastern Africa, with a population of 30 million people. The country has a plains region, a hill region, and a region with high mountains. It has a number of ecosystems. The plains are dry for much of the year, there is some rainforest, and the rest of the country includes both hills and mountains. There are two seasons of heavy rainfall.

The citizens come from several ethnic groups that tend to live in their own regions and speak different languages. The ethnic groups largely follow one of three different religions. The large cities are mixed ethnically. One ethnic group is economically and socially very dominant. The people from this group live in the capital and most of the large cities. The national language is the language of this dominant ethnic group.

According to World Bank criteria, Skolnikland is among the poorest countries in the world. The economy has been growing at about 4% per year on average over the last decade, but the economy had very slow economic growth in the decades prior to that. The richest 10% of the population controls 80% of the national income.

About 80% of the people live in rural areas and 20% in urban areas. The number of people living in urban areas has been growing recently at an increasing pace. Most people earn their livelihood in agriculture but there is an increasing garment manufacturing industry in the two largest cities. There are also a number of mining industries. In addition, other export industries are beginning to grow, mostly focused on the export of commodities to China.

The total fertility rate is about 4.5 but it has been declining slowly over the last two decades, from over 6. There is an almost equal number of men and women in the population. Infant mortality is about 90 per 1,000 live births. Maternal mortality is about 500 per 100,000 live births. Thirty-five percent of the children are underweight for age.

The adult literacy rate is about 40%. The educational enrollment rate, especially for girls at the primary and secondary levels, has been growing slowly, but steadily. Most recently, this rate has been growing at an increasing pace and about 75% of the girls now attend school regularly, although many of them are of very low quality.

Only about 50% of citizens have access to safe water. Only about 30% have access to sanitary disposal of human waste.

HIV prevalence is 7% of the adult population. The number of new HIV cases annually has begun to plateau. About half of the people eligible for treatment for HIV are on treatment. Malaria is rampant in the plains.

Investments in the road system have been growing at a solid pace in the last decade and the use of private automobiles has begun recently to increase more rapidly.

Skolnikland has a pluralistic health system that is made up of public and private institutions, publicly financed providers, licensed private providers, unlicensed medical practitioners, and traditional healers. There is no health insurance, except for some free services for the poor in the few publicly financed hospitals, which the better off people do not attend. The health system is not very effective or efficient and is generally of low quality. The HIV, TB, and malaria programs are not effective or efficient and they are just beginning to adopt paradigms for services that follow global best practices.

QUESTION 11

If you were interested in investing in maternal and child health using a results-based financing scheme, which program is the most appropriate?

A. Invest in training more skilled birth attendants in a village.

B. A plan to give the local clinic in the village a grant after the clinic demonstrates that its efforts have led after two years to lower under-5 child mortality.

C.Provide all pregnant women in the village with a full course of antenatal vitamins.

QUESTION 12

In Skolnikland today, approximately what proportion of the burden of disease, measured in DALYs, is likely to be Group I-related?

A. 45%

B. 35%

C. 60%

QUESTION 13

In Skolnikland, life expectancy fell in the 1990s, which can be attributed to:

A. Malaria

B. HIV

C. Pneumonia

QUESTION 14

In Skolnikland, the cost for treating severe diarrhea in young children is $18 for community-based care and $20 for clinic-based care. The cure rate for community-based care is 60%. The cure rate for clinic-based care is 90%. Which approach is the most cost-effective?

A. Community-based care

B. Clinic-based care

C. They are equally cost-effective

QUESTION 15

In Skolnikland, what are likely to be three of the five leading causes of death of under-5 children, besides perinatal causes?

A. TB, diarrhea, pneumonia

B. Malaria, diarrhea, measles

C. Diarrhea, malaria, pneumonia