What are the 4 evolutionary processes? Describe them, how does each contribute, and which dominate and under what circumstances?

In essay format please! :)

Before starting a purity plate, you can ensure you have a pure culture if (check all that apply)

A)all the colonies are convex but different colors

B) you use cells from only one colony as an inoculum source

C) the inoculum contained only gram-positive cocci

D) all the colonies are the same color but different size

can someone help me with this

Select all of the statements that are true.

1. Membranes can contain lipids, proteins, and carbohydrates.

2. Fatty acids will form a membrane bilayer in an aqueous solution.

3. Membranes are static.

4. Membrane composition is symmetrical.

A businessman moves from Thailand to pursue a job opportunity in the US. His diet changes from one high in local raw fruits and vegetables to mainly canned and frozen vegetables. The fresh produce he does buy typically ships from overseas and since it doesn't taste good to him, he tends to avoid it. Over the course of his first year, the man experiences worsening fatigue, headaches, depression and gastrointestinal discomfort, despite taking mineral supplements and making sure to stay hydrated. After about a year he meets with a nutritionist who advises him to consume more raw produce from farmer's markets; this intervention does alleviate his symptoms.

Use your knowledge from this course and the information provided to address the following:

a) What specifically about the man's dietary change likely caused his initial symptoms and why was the nutritionist's recommendation effective?

b) Why do you think the nutritionist suggested he get his produce from local farmer's markets rather than a grocery store?

c) If the man were to move somewhere with little access to fruits and vegetables, what else could the nutritionist have suggested that would have been effective and why?

NOTE: For full credit you must apply your knowledge. Just restating the information provided is not sufficient. ie. saying "he changed his diet to eat raw vegetables" is just restating the information - explain, use your knowledge and provide your logic.

This week we have been learning about the methods archaeologists and paleontologists use to reconstruct the past. Now it’s time to get creative and apply this new knowledge to the present day. This is going to involve a little bit of research and creativity on your part. Pick a room in your house, apartment, dorm, or alternative domicile. If you walked out the door today and your room remained untouched for 100, 1,000 or 50,000 years, what would be left for archaeologists in the future to analyze?

Think about the types of materials that make up your room and how they will degrade over time. Do you have metal, ceramic, glass, and wood in your room? Did you leave chicken bones in your trash or canned soup in the pantry? What types of methods that we employ today, would researchers use to “date” your room? For example if you have ceramic dishes an archaeologist might use thermoluminescence dating to try to figure out when they were made.

Post a paragraph discussing a few of the main things that you think might still be around for archaeologists to find, and include how researchers might identify how old they are. You can insert pictures or drawings in your post if you would like too. In addition, think about what types of issues researchers in the future could have trying to analyze materials from today?

How does the voltage sensitivity of K⁺ conductance contribute to the action potential?

Explain Operons Detailly

a. Describe the purpose of the essential operon components (promoter, operator, genes, regulatory protein). Keep your answers general for all operons.
​​​​b.Contrast repressible and inducible operons. Include descriptions of differences at the level of both function and molecular interaction.

c. Metabolically why does it make sense that the Trp Operon is a repressible operon and the Lac Operon is an inducible operon?

Evolution by natural selection is initially relatively more rapid when against a common recessive allele than against a common dominant or codominant allele.

(1 mark): Why?

You cross the following two individuals:

Individual 1: A/a;B/b;C1/C2

Individual 2: a/a;B/b;C1/C2 A is fully dominant, B is dominant lethal, whereas C1 and C2 are incompletely dominant

The proportion of offspring that are expected to have the same phenotype as individual 1 is _________

You have cell A and cell B. A changes phenotype after you place it in an in vitro co culture system with cell B. How do you determine is this is the result of paracrine or contact-dependent signals?

briefly describe characteristics of these representatives that allow you to dintisguish the diferent orders.

Calcarea

Demospongia

Hexactinellidae

Which of the statements describes purines and pyrimidines in DNA molecules? (Pick more than one)

Pyrimidines consist of a one-ring structure.

Pyrimidines form hydrogen bonds with purines.

Pyrimidines form covalent bonds with purines.

Adenine and guanine are pyrimidines.

Purines form hydrogen bonds with purines.