Homework Help for Biology

What are five key factors contributing to the increase in incidence of emerging infectious diseases and which one or ones do you think played a role in the emergence of Zika virus in the Western Hemisphere?

Evolutionary important character of Selaginella is

(a) heterosporous nature

(b) rhizophore

(c) strobili

(d) ligule.

if mutations in tumor suppressor genes are recessive, how can you account for the fact that li-fraumeni syndrome is inherited in an autosamal dominant manner?

Antibiotics have saved millions of lives since they were first observed by Pasteur and Koch and later named by Selman Waksman in 1942. Unfortunately, antibiotic-resistant microbial strains are becoming more prevalent and therefore making once easily treated infections more difficult to treat.

For your initial discussion post, share your thoughts on three ways that society - not physicians or medical staff - can help to reduce the development of drug-resistant microbial strains.

how does vasoconstriction and vasodilation of arteries occur.

GENETICS PROBLEMS

PLEASE help me with these questions! I've provided the answers I just need to see the WORK, detailed work so I can understand. Thank you sooo much.

29. In a dihybrid cross AAbb × aaBB, what proportion of homozygotes is expected among the F2 offspring?

Answer: 1/2

30. In a dihybrid cross AABB × aabb, what proportion of heterozygotes for both gene pairs is expected among the F2 offspring?

Answer 1/2

31. In the dihybrid cross AaBb × aabb, what proportion of homozygotes is expected among the F1 offspring?

Answer: 1/2

Name the components involved in the recognition of a bacterial derived peptide by the TCR

Certain species of Bacteria have been identified to always cause obesity.

True or False?

Unit 2 Organic Chemistry

Organic compounds vs. Inorganic compounds

What makes a compound organic? Inorganic?

Functional groups (phosphate groups, amino groups, carboxyl groups)

Know the structure of each of these groups, and which organic compounds they are found in. You can draw them for your own use.

Hydrolysis

What is it? What is it used for?

Dehydration synthesis

What is it? What is it used for?

Carbohydrates (Monosaccharides, Disaccharides, Polysaccharides and examples)

Know the process of joining two monosaccharides together to create a disaccharide.

Be able to give examples of several monosaccharides, disaccharides and polysaccharides.

Lipids (Saturated vs. Unsaturated; Phospholipids, Steroids)

Define a saturated fatty acid.

Define an unsaturated fatty acid. Draw if it helps.

What process is used to put the fatty acid chain on a glycerol molecule?

Hydrophilic vs. hydrophobic

Define hydrophilic.

What part of the phospholipid is hydrophilic?

Define hydrophobic.

What part of the phospholipid is hydrophobic?

Proteins, types and functions

What is a protein composed of, and what does it do?

Amino acids

Name the three parts of the amino acid that come off the common Carbon.

Identify each of the three parts. (Amino Acid ID game)

Peptide Bonds

How are they formed?

What two parts of each amino acid do they join together?

Enzymes - define.

Levels of Protein structure

Complete the chart below.

Protein Denaturation

What is it and how does it happen?

Define what a Solute is.

Define what a solvent is

Nucleic acids (DNA, RNA, ATP)

Nucleotide

Name its three parts and be able to identify each of them on a diagram. (Nucleotide ID game)

What are the two possible sugars used in a nucleotide?

Complete the Table below.

Cite two examples of tissues, and mention their specific location in the body; explain the relationship between their structure and the particular role they have in that location.

(Problem 35a) E. W. Lindstrom crossed two corn plants with green seedlings and obtained the following progeny: 3583 green seedlings, 853 virescent-white seedlings, and 260 yellow seedlings (E. W. Lindstrom. 1921. Genetics 6:91–110). Give the genotypes for the green, virescent-white, and yellow progeny. Use A and a and B and b to denote dominant and recessive alleles for the genes involved.

Please explain why, thanks in advance.

A. green - A_B_ and A_bb, virescent-white - aaB_, yellow - aabb

B. green – AAB_, virescent-white – aaBB, yellow - aabb

C. green - AbBb, virescent-white – aaBB, yellow - aabb

D. green - AABB, virescent-white – AaBb, yellow - aabb E. green - A_B_ and A_bb, virescent-white – aaBB, yellow - aaBb

High serum levels of glucose (25mM) and low levels of fructose (0.2mM) activate what enzyme?

Class: Microbiology

Discuss the major histocompatibility complex with regard to its:

a. location

b. composition,

c. relationship to specific cell markers,

d. role in regulation of immune reactions

Describe presystemic elimination. What are the types of absorption/administration that would 
be subject to presystemic elimination? When a laboratory animal is injected with a toxicant into the intraperitoneal, subcutaneous, intramuscular, or intravenous routes of administration, will the toxicant be exposed to the processes of presystemic elimination?

Pyruvate kinase deficiency is an inherited metabolic disorder that affects the survival of red blood cells. Erythrocytes have no mitochondria and are thus dependent on glycolysis and fermentation for their energy needs. A blood smear of pyruvate kinase deficient erythrocytes shows that the cells are misshapen and swollen; they have lost their flexible discoid shape and eventually lyse. Explain how pyruvate kinase deficiency can lead to the lysis of red blood cells.