Biology Answers

Select from the following choices and you may use the answer more than once.

WEIGHT LOSS,/ NURSING,/ FEAR,/ , WOUND HEALING,/ BLOOD PRESSURE/, SWEATING,/ HYDRATION/, BLOOD GLUCOSE,/ BODY TEMPERATURE,/ DEHYDRATION/, LABOR AND DELIVERY

Then determine if it is a POSITIVE OR A NEGATIVE FEEDBACK in order tofor the body to maintain homeostasis.

1. A team of hunters got lost in a snowy forest, they begin to shiver and huddle close together.
2. In the events leading to childbirth the stretching of the uterus triggers a release of oxytocin. Eventually the baby’s head pressing against the cervix triggers more oxytocin until the mother is in full labor.
3. A seamstress working on a prom dress accidently sews through her finger. After a few minutes the puncture wound no longer bleeds.
4. A butcher slices his finger on a blade. He wraps it in a towel until the bleeding begins to subside.

Select from the following choices and you may use the answer more than once.

WEIGHT LOSS,/ NURSING,/ FEAR,/ , WOUND HEALING,/ BLOOD PRESSURE/, SWEATING,/ HYDRATION/, BLOOD GLUCOSE,/ BODY TEMPERATURE,/ DEHYDRATION/, LABOR AND DELIVERY

Then determine if it is a POSITIVE OR A NEGATIVE FEEDBACK in order tofor the body to maintain homeostasis.

1. After running a jogger feels very thirsty and drinks some water. 
2. A man faints in the labor and delivery room.
3. A young child is ill. They refuse to keep a cover on and begin to sweat.
4. A group of teens visits a haunted house and one of the teens is frightened and their heart beats harder than normal. 

PCR is useful in population genetics because at times it can be used to study the genetics of bacteria that can’t be cultured axenically.

a. False

b. True

Which of the following statements is NOT true?

d. ions are lost via the skin when we sweat

b. urea is a waste product formed in the kidneys and excreted in the urine

c. carbon dioxide is a waste product of respiration and it leaves the body via the lungs

a. water leaves via the lungs when we breathe out

Are foods derived from genetically modified crops nutritionally superior?

b. Yes, they offer some health advantages over foods produced from conventional crops.

d. No, they are slightly less healthful than foods from conventional crops.

e. No, foods produced from genetically modified crops are a known health risk.

a. Yes, they offer substantial health advantages over foods produced from conventional crops.

c. No, they are neither better nor worse than foods from conventional crops.

In the case of low blood glucose concentration, the negative feedback is

b. to workout

d. conversion of glycogen to glucose

c. to rest

a. conversion of glucose into glycogen

What effect does ADH have on the kidneys?

b. it causes them to release more water

a. it causes them to reabsorb more water resulting in a more concentrated urine

c. resulting in a more concentrated urine

d. it causes them to reabsorb less water resulting in a more dilute urine

What would NOT happen if the core body temperature was too low?

b. shivering would release energy by muscle contraction

d. hair erector muscles would contract

a. there would be a reduced blood flow through the skin capillaries

c. sweat would cool the body as it evaporated

What are the current benefits of having foods made from genetically modified crops? 

c. They improve convenience for consumers, e.g. by creating foods with longer shelf lives.

b. They allow farmers to greatly increase the number of crops produced.

d. They improve the nutritional quality of foods.

a. They improve farm profitability and make some farmers' jobs easier.

e. They cause less damage to the environment than conventional chemical-intensive agriculture.

Which of the following is useful in applications of PCR?

b. Only one sample’s analysis can be carried out at a time

d. The amount of DNA required initially is high

a. It is manual

c. It is having a high speed

Which part of the brain contains the thermoregulatory center? 

c. hypothalamus

d. medulla

b. cerebral cortex

a. cerebellum

The hormone that is released by the kidney in response to the decreased oxygen level of the tissues called 

b. natriuretic hormone

c. erythropoietin

d. renin

a. Vitamin D

What are the main issues of concern for human health? While theoretical discussions have covered a broad range of aspects, the three main issues debated are tendencies to provoke allergic reaction (allergenicity), gene transfer, and outcrossing. 

a. False

b. True

What’s the name of the process that controls water levels in the body? 

c. osmoregulation

b. osmosis

a. diffusion

d. thermoregulation

Where do you find temperature sensitive receptors? 

a. the kidney

d. the blood

b. the skin

c. the thermoregulatory centre

Why is it important to maintain a constant body temperature? 

b. to maintain the optimum temperature for enzymes

c. to stop the multiplication of bacteria in the body

d. so that we have enough energy to move

a. so that we don't get cold