Question

neutral carbon atom has 6 protons, 6 neturons and 6 electrons. What is the atomic mass of Carbon?

   1.  
18

    2.  
12

    3.  
6.00127

    4.  
12.0107

10 points   

QUESTION 17

Charles Darwin's theory of descent with modification was formulated from two basic observations, which of the following is one of those observations?

   1.  
A population usually can produce many more offspring than will can be supported

    2.  
All mutations lead to lower reproductive success

    3.  
the basis for variation of traits is genetic mutation

    4.  
Mutations of DNA sometimes confer an advantage to individuals who have them

10 points   

QUESTION 18

Which of the following is a clear difference between methane and butane?

   1.  
Methane is a functional group and butane is a hydrocarbon

    2.  
Methane is more reactive than butane, and thus more flammable than butane

    3.  
Butane can form a structural isomer while methane cannot

    4.  
Butane is polar, while ethane is nonpolar

10 points   

QUESTION 19

Which of the following is/are true?

   1.  
Electrons have a negative charge roughly equal to a proton but have no mass

    2.  
The number of neutrons in an atom must equal the number of protons and electrons

    3.  
On average, 50 % of all the mass in an atom is found in the neutrons

    4.  
Electrons account for about 1% of the mass of an atom

10 points   

QUESTION 20

Which of the following pairs of molecules are most similar in terms of function?

   1.  
glucose and glycogen

    2.  
glycogen and starch

    3.  
glucose and starch

    4.  
cellulose and starch

Answer 1

Answer:

16). 2). 12

Explanation:

Atomic mass = No. of protons + no. of neutrons = 6+6 = 12

17). 1. A population usually can produce many more offspring than will can be supported

Explanation:

Darwin drew two inferences from two observations. Observation #1: Members of a population often vary in their inherited traits. Observation #2: All species can produce more offspring than the environment can support, and many of these offspring fail to survive and reproduce.

18). 3. Butane can form a structural isomer while methane cannot

Explanation:

Butane has two isomers and methane has not

19). 1. Electrons have a negative charge roughly equal to a proton but have no mass

20). glycogen and starch

Explanation:

Both glycogen and starch are reserved food materials in animals and plants respectively.