Steroid hormones have a longer half-life than peptide hormones because (a) they ride on carrier proteins in the blood answers a and b are correct. (b) they can be stored temporarily in fat tissue (c) they are broken down by target cells more slowly (d) they are excreted by the kidneys more slowly answers a, b, and c are correct.

The answers are A, B, & C. Steroid hormones have a longer half-life than peptide hormones because steroid hormones ride on carrier proteins in the blood.  In other words, they are bound to protein carriers that transport molecules across the membrane.  They can also be stored temporarily in the adipose tissue. And also, steroid hormones are sent to the nucleus where it regulates transcription while peptides don’t require this process. This is the reason why the effects of steroid hormones are exerted more slowly than peptides. 

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.