Question

Answer please, no explanation needed

For a species with a haploid number of three chromosomes (n=3), how many different combinations of chromosomes are possible in the gametes?

a)2b)3 c)6 d)8 e)64

The movement of chromosomes during cell division, the movement of vesicles along microtubules, and the contraction of skeletal muscles all depend on: ?

a)nuclei b)kinetochores c)centrioles d)histones e)motor proteins

Which of the following places the molecules in the correct order from least potential energy to most potential energy:

a)glucose, starch maltose b)galactose,chitin, lactose c)lactose, glycogen, sucrose d)starch,glucose, maltose e)glucose, sucrose, starch

A sample of DNA has 30 percent thymine. What percent of guanine is present?

a)20 b)30 c)50 d)75 e) can’t tell by info given

Answer 1

Answer-

1-d- 8

2-e- motor proteins

3--e- glucose , sucrose ,starch

4-a- 20

Explanations -

if the number of haploid or diploid Chromosomes is given then the formula to calculate chromosomal combinations is 2^n where n = number of haploid Chromosomes.

In this case 2^3 so 8 .

3) the potential energy is stored energy which increases with the number of monosaccharide subunits .

Glucose is a monosaccharide , sucrose is a disaccharide made of alpha glucose and beta fructoes units . Starch is a polymer containing multiple glucose subunits linked together. Starch is a storage form of energy for this reason.

4) according to Chargaff's rule

Number of purines = number of pyramidines.

So A+ T = G+ C

Also A+ T+ G+ C = 100

So if thymine (T) = 30 ,Adenine (A) also = 30.

So A+ T = 60

So G+ C = 100 – 60 = 40

So G= C= 20 %

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