Question

CHOOSE THE CORRECT ANSWER AND EXPLAIN FOR EACH OPTION WHY YOU DID NOT CHOOSE THAT OPTION.

Arrange the following events in steroid function in chronological order. Number each statement

from 1-5.

_____Level of estradiol increases

_____Decrease in the thickening of uterine lining

_____Ovulation triggered by luteinizing hormone

_____If no ovum is fertilized, progesterone and estradiol production stops

_____Bleeding due to sloughed off uterine lining

a. 3, 2, 4, 1, 5

b. 3, 1, 4, 2, 5

c. 1, 4, 3, 2, 5

d. 1, 4, 2, 3, 5

Arrange the following events in lipid transport in chronological order. Number each statement from 1-5.

____ Cell use the cholesterol as part of the membrane

____ apoB-100 binds to LDL-receptor in coated pits

____ VLDL contains triglycerides and cholesteryl esters

____ Endocytosis of LDL into the cell

____Removal of all VLDL molecules except for the cholesteryl core

a. 5, 3, 1, 4, 2

b. 5, 4, 3, 2, 1

c. 3, 1, 4, 5, 2      

d. 3, 5, 2, 1, 4

Which of the following pairs would form hydrogen bonds?

A. Gly-Ala    B. Ser-Asp   C.Val-Ile      D. Phe-Thr

Which peptide sequence has an aromatic residue?

A. L-C-D-V-G-T

B. I-K-R-Y-N-E

C. M-P-A-Q-S-D

D. T-C-S-L-Q-G

Answer 1

The following events in steroid function in chronological order are

.c). 1, 4, 3, 2, 5

1._Level of estradiol increases

4. If no ovum is fertilized, progesterone and estradiol production stops

3.Ovulation triggered by luteinizing hormone

2.Decrease in the thickening of uterine lining

5. Bleeding due to sloughed off uterine lining

Events in lipid transport in chronological order.

(b). 5, 4, 3, 2, 1

VLDL contains triglycerides and cholesteryl esters secreted by the liver. VLDL stands for very-low-density lipoprotein. Your liver makes VLDL and releases it into your bloodstream. The VLDL particles mainly carry triglycerides, another type of fat, to your tissues. VLDL is similar to LDL cholesterol, but LDL mainly carries cholesterol to your tissues instead of triglycerides.

5.Removal of all VLDL molecules except for the cholesteryl core

4.Endocytosis of LDL into the cell

3. VLDL contains triglycerides and cholesteryl esters

2. apoB-100 binds to LDL-receptor in coated pits

1. Cell use the cholesterol as part of the membrane

question :- Pairs would form hydrogen bonds

Answer (B) Ser- Asp forms Hydrogen bond

In the secondary structure of proteins, hydrogen bonds form between the backbone oxygens and amide hydrogens. When the spacing of the amino acid residues participating in a hydrogen bond occurs regularly between positions i and i + 4, an alpha helix is formed.

Question :- peptide sequence has an aromatic residue

Answer :- (B)  I-K-R-Y-N-E this sequence has Tyrosine i.e.aromatic amino acid which is denoted by the alphabet Yand the others does not have these aromatic compound like Phenylalanine (F) ,Tyrosine (Y) and tryptophan (W).