Biology Answers

'Watchful-waiting' for certain types of breast cancer includes.
(A) treatment with an anti estrogen drug (C) regular Doctor visits
(B) regular MRI scans (D) A, B and C

1. Make a table of fliuds infecting human beings and means of infection.
2. In a table list the common sextodes of human and their mode of infection.
3. Draw a life cycle of a of a beef tapeworm taenia saginata hepatical and clonoichis sinensis.
4.what is a praglothis
A scolex
A strobila
A rhabdite
5.how do tapeworm be obtain nutrients
6.what is the function of opisthaptor
7.the economic importance of parasites.

Rhodobacter lauracita is a newly discovered bacterium and is a manganesebased
photoautotrophy. Light provides the energy necessary to drive the
production of organic carbon. (Be careful, this question set is asking about
assimilation, rather than dissimilation reactions)
a. How much free energy in kJ/mol would be required to form one mole of
glucose (C6H12O6) if reduced manganese (Mn2+) served as the electron donor
for R. lauracita? Assume that Mn2+ is oxidized to the solid MnO2 (activity =
1), pH = 7, and that Mn2+ and glucose are present at 10-4 M. The partial
pressure of carbon dioxide is 10-3.5 atm. Give the answer in kJ per mole of
glucose produced.
E0’ (V)
1/2 MnO2(s) + 2 H+ + e- = 1/2 Mn2+ + H2O +0.58
1/4 CO2(g) + H+ + e- = 1/24 C6H12O6 + 1/4 H2O -0.43
Fe(OH)3(am) + 3 H+ + e- = Fe2+ + 3 H 2O +0.06

Discuss how crossing-over leads to greater variability of phenotypes. Give an example to help explain your answer.

Are birds more like humans or kangaroo rats in the challenges they face in deserts and the way they cope with these challenges?

How can you estimate the concentration of the urine that a species of rodent produces if the only information you are given is a photograph of an intact kidney from that species? Explain.

Most mammals have a layer of cutaneous fat beneath the skin, but dromedary camels concentrate fat storage in their hump. What is the significance of that difference for the thermoregulation of camels?

Compare the advantages and disadvantages of large body size for mammals that live in cold environments. Go beyond the information presented in the chapter.

What arctic animals use countercurrent circulation? Where in those animals is it most conspicuous?

Why does an endotherm’s metabolic rate increase above the upper lethal temperature? And why does the metabolic rate fall below the lower lethal temperature?