Biology MCQ thread..!!

[EzioAuditre]

check winter 2003 Q25 and may 2008 Q27???

 

[lychee26]

Please post the questions here.

 

[Banglarbagh]

WINTER 2003 Q.25 ANS IS A..!
SUMMER 2008 Q.27 ANS IS C.!

 

[lychee26]

12 Which statements about amylopectin and glycogen are correct?
1 both contain 1-4 glycosidic bonds
2 amylopectin contains β-glucose
3 glycogen contains more 1-6 branches than amylopectin
A 1 only B 1 and 2 C 1 and 3 D 2 and 3

 

[melon159]

C???

 

[ShootingStar]

12 Which statements about amylopectin and glycogen are correct?
1 both contain 1-4 glycosidic bonds
2 amylopectin contains β-glucose
3 glycogen contains more 1-6 branches than amylopectin
A 1 only B 1 and 2 C 1 and 3 D 2 and 3

C

 

[lychee26]

why C ?

 

[lychee26]

why not A?

 

[lychee26]

18 Male bees are haploid. They develop from unfertilised eggs. Female bees are diploid.
Which statements are correct?
1 All male bees are genetically identical.
2 Male bee sperm cells are produced by mitosis.
3 New combinations of genes only occur in female bees.

A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3

 

[ShootingStar]

why C ?

Amylopectin is made up of many 1,4 linked alpha glucose molecules (not beta glucose) and it has branches formed by 1,6 linkages. Glycogen is similar to amylopectin in the sense that it is also made of 1,4 linked alpha glucose with 1,6 linkages forming branches...However, glycogen molecules tend to be more branched than amylopectin molecules. Hence, statements 1 and 3 are correct.

 

[lychee26]

thanks.

could you please tell this one ?

18 Male bees are haploid. They develop from unfertilised eggs. Female bees are diploid.
Which statements are correct?
1 All male bees are genetically identical.
2 Male bee sperm cells are produced by mitosis.
3 New combinations of genes only occur in female bees.

A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3

 

[ShootingStar]

thanks.

could you please tell this one ?

18 Male bees are haploid. They develop from unfertilised eggs. Female bees are diploid.
Which statements are correct?
1 All male bees are genetically identical.
2 Male bee sperm cells are produced by mitosis.
3 New combinations of genes only occur in female bees.

A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3

C. Male bees are haploid so they cannot be genetically identical as that occurs only in mitosis. Statement 2 has to do with asexual reproduction. Statement 3 is also correct as meiosis allows genetic variation

 

[sweetiepie]

urgent help here viewtopic.php?f=26&t=9424 ...

 

[lychee26]

thank you so much.

 

[Romeo10]

I want for the following questions plz. :
1- J10/11 23. What is the minimum no. Of base substitutions required to change the nucleotice sequence of the HbA allele to the HbS allele?
A. 1 B. 2 C. 3 D.4
why it is A??
2- J10/11 no. 26 why it is B ?????
3- J10/11 no. 8 why it is D ????
4- no. 27 in the same exam .....
5- N05/01 no. 37 why it is B ???
Plz i want explanations for the answers as i no the answers and i will be thankful!!
Sry for not posting pics of the questions here
thx in advance

 

[lychee26]

I want for the following questions plz. :
1- J10/11 23. What is the minimum no. Of base substitutions required to change the nucleotice sequence of the HbA allele to the HbS allele?
A. 1 B. 2 C. 3 D.4
why it is A??
2- J10/11 no. 26 why it is B ?????
3- J10/11 no. 8 why it is D ????
4- no. 27 in the same exam .....
5- N05/01 no. 37 why it is B ???
Plz i want explanations for the answers as i no the answers and i will be thankful!!
Sry for not posting pics of the questions here
thx in advance

Question 26: it is B because the sucrose is loaded in the sieve tube elements in leaf as a result water potential decreases. In order to build up a hydrostatic pressure sugars are moved out .. as a result the food moves from the leaf to the roots in a mass flow manner.

 

[fries25]

i thnk da ans 2 12 is D... cux all da rest of da options r basically wrong... condensation is a anabolic process triglycerides r more energy value... n so on
correct me if i m wrong...!

Yes it is BUT that is not the reason. Babies require a gradual release of energy because their body's circulation system can not cope with large amounts of energy at the same time.

 

[fries25]

10 views..no answer :roll:

The answer to 24 is D. Convert all tRNA anticodons to mRNA codons and check which of them is not present from the list given above.

 

[ShootingStar]

explain please

 

[lychee26]

hey guys! How does atheroma form ?