Other Biology Answers

In 5 points, Discuss aquatic, terrestrial and arboreal habitats in relation with adaptation and survival of organisms in these habitats

A. Determine whether the following are molecules or ions. 

1. fluorine gas (F )

2. lithium fluoride (LiF)

3. glucose (C ) H O

B. Indicate the number of electrons lost or gained in forming theses ions:

1. Gold (III)

2. OH 

C. Give the name of each of the following compounds.

1.NO2

2.NaF

3. CaBr2

D. Given the name of the compound, write the molecular formula. 

1.carbon monoxide

2.nitrogen trichloride

1. Determine the number of atoms in 1.75 mol Al

2. Calculate the number of formula units in 25.0 mol NaNO3

3. Given 6.25 mol H O2 determine the number of molecules.

DIRECTIONS: A. How many atoms are in each of the following samples?

a atoms Ne

b molecules CH4

1. What is the percent composition of the following compounds?

a Naphtalene (C10 H8)

b Sucrose (C12 H22 O11)

c Alu um sulfate Al2(SO4)3

Each description below could be used to describe either plants or fungi. Select the 8 descriptions that apply to the Plant Kingdom:

a) includes mushrooms

b) cell walls of chitin

c) have chloroplasts and ribosomes

o)have ribosomes but no chloroplasts

d) includes ferns

e) photosynthesis

f) absorptive nutrition 

g) includes yeasts

h) includes molds

i) chemoheterotrophs

j) fermentation

k) cell walls of cellulose

l) photoautotrophs

m) includes mosses

n)alternation of generations life cycle

Speciation is a process in which ones species gives rise to new species. A population of plants or animals that are separated from their species can no longer exchange genetic material with their original

group is known as

1.Write out the floral formula and description for the Ray floret.

2.Write out the floral formula and description for the Disc floret.

The population of disease doubles every 90 minutes when growing under ideal conditions.

A different starter culture was prepared containing 1 * 10 ⁷ cells.

Sketch a growth curve on a graph (with axes ‘log₁₀ number of cells’ on the y axis and ‘time in hours’ on the x axis) you would expect for the yeast culture over the first 15 hours .

Student prepared to start a culture using 2.5*10^-3g yeast cells in 1d^m3 nutrient broth.

The average mass of yeast cell is 2*10 ^-11g.

calculate the number of cells in the starter culture 

Give your answer in standard form 

 A light microscope can be used to observe yeast cells.

 State the equipment that would be needed in addition to a microscope to measure the average time diameter of yeast cells.

The student wanted to study the effect of the different sugars in the rate of growth of a yeast population.

They used to colorimeter to measure the absorbance of a culture of yeast cells.

The absorbance of the yeast culture is proportional to the concentration of yeast cells.

As the yeast is multiplied it was necessary to dilute the sample to obtain a reading on the colorimeter.

Describe how the student could 1cm³ cubed pippets and 10cm³ measuring cylinders to dilute the sample so that it was 10,000 times less concentrated .