Biology Answers

How might age affect bone repair and healing after a fracture? And one biological reason why ageing is thought to have these effects?

Simple organisms, like yeast and bacteria, can survive in dead zones. Larger, complex organisms like fish require oxygen to survive. Why is this? Use the following words in your answer

What happens if the core body temperature is too high? 

b. the capillaries move closer to the surface of the skin

a. the blood vessels supplying the capillaries dilate

d. the capillaries constrict

c. the capillaries dilate

A reaction mixture for PCR consists of ____________ 

b.primers in a limited amount

d. a region complementary to the sequence to be amplified

a. heat unstable polymerase

c. deoxynucleoside triphosphate (dNTPs)

What is the best definition of homeostasis? 

b. maintenance of a constant internal environment

c. keeping a constant temperature

a. getting rid of waste

All options are correct except: 

c. carbon dioxide is transported to the lungs

a. carbon dioxide is produced in very small quantities in living organisms

b. carbon dioxide is produced by the cells respiring aerobically

d. carbon dioxide is taken in small quantities

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 toddler got into his sister’s candy stash and ate tons of candy.
2. A new mother’s is nursing her baby. Her baby is not very hungry and her milk supply seems to go down. Once the baby is suckling more regularly the mother’s milk supply goes back up.