Biology Answers

What structural characteristics are common to all the amino acids that are found in
mammalian proteins and draw the structure of the tripeptide Pro-Asp-Lys in the ionic
form that predominates at pH 7. Show all atoms (including hydrogens) as well as
any charges as necessary.

Light energy absorbed by the pigment molecules of antenna complex transfer it to which part of reaction center

Is Gastrin Hormone produced by liver endocrine cells, glands? Or exocrine cells?

A piece of hair is forcibly removed from the scalp. If any connective tissue remained attached to the follicle cells, what type of connective tissue would you find?

Mosty areolar

Mostly dense irregular

Mostly adipose

Epithelial


Question 2 2 pts
Eccrine glands (not including the duct) are typically found in the stratum granulosum layer.
Group of answer choices

True

False


Question 3 2 pts
One cause of human albinism is a defect in the tyrosinase protein, an enzyme that helps to control melanin production. In what epidermal layer is tyrosinase functioning?

Stratum corneum

Stratum granulosum

Stratum spinosum

Stratum basale


Question 4 2 pts
The papillary layer of the dermis is most closely associated with which layer of the epidermis?


Stratum corneum

Stratum granulosum

Stratum spinosum

Stratum basale


The stratum lucidum is present in both thick and thin skin.

A. True

B. False

What does pH measure?


the total number of base molecules in solution

the concentration of hydrogen ions in solution

the total number of acid molecules in solution

the concentration of oxygen atoms in soluti

In this assignment, you are required to select
ONE (1) specific prokaryote and eukaryote, each.
For each chosen prokaryote and eukaryote, briefly describe the THREE (3) main
components of its cell structure by providing the following information.
(i) ONE (1) specific lipid that makes up the plasma membrane
(ii) ONE (1) specific protein that can be found in the cytoplasm
(iii) ONE (1) specific genetic material
Compare both chosen eukaryote and prokaryote by providing TWO (2) differences between
them.
In addition, provide the location where each chosen prokaryote and eukaryote can be found.
ONE (1) picture of each chosen prokaryote and eukaryote should be included.
Briefly describe ONE (1) organelle and the endomembrane system can be found in the
chosen eukaryote and prokaryote.

What DNA nucleotide triplet codes for codon UGU? Identify
a base-pair substitution that would produce a silent mutation
at this codon. Identify a base-pair substitution that would
result in a missense mutation at this codon. Identify a base-pair
substitution that would produce a nonsense mutation at this
codon.

1) Acetyltransferase enzymes modify a lysine side chain with an acetyl group. Titration of the pKa of the lysine substrate reveals the pKa value to be 8.1. What is the likely environment surrounding the lysine sidechain before it is acetylated? (Choose all that apply)

Cannot hypothesize based on the given information and prior knowledge
Water accessible active site in the enzyme
Water inaccessible highly polar active site
Largely non-polar and water inaccessible active site
Solvent exposed and near the enzyme surface

Does the death of an organism prior to reproduction affect the process of natural selection? Explain?

What controls and directs the production of proteins in living things