11. Is the lac operon a repressible or an inducible operon? What happens in the absence of lactose? What happens in the presence of lactose? Is the trp operon a repressible or an inducible operon? What happens in the absence of tryptophan? What happens in the presence of tryptophan?

Describe the structure of the COVID-19 virus

(1) Trophic Cascades in theSerengeti. Watch Dr. Cox's video on "What Rinderpest eradication taught us about the Serengeti", which can be found in the Instructor Insights folder for this week. Then address the following questions: (a) How did eradication of Rinderpest from East Africa increase both the tree and giraffe populations in the Serengeti? (b) How did eradication of Rinderpest from East Africa increase the population of predator species in the Serengeti? (c) What does this tell us about ecosystems?

(2) Biomes. The term "biome" is described in the textbook. For this topic, describe the biome where you grew up (or where you currently live). Identify your location, the biome of the region, and describe the major characteristics of that biome. Add enough detail and commentary from your own experience, so that your answer is 125 words or more. If you're really ambitious, you could consider looking up the "ecoregion". The EPA maintains information about that.

(3) Shrinking Red Knots. Read two of the following three articles: Briggs (2016); Dussault (2016); Zimmer (2016). (A) In your own words summarize the basic story that the articles have in common. (B) Of the two articles you read, which of them do you prefer? Why?

You have allergies that are causing severe nasal congestion and you can’t smell anything. Your roommate knows you aren’t feeling great, so they offer to make you breakfast. When you get to the table, you see two steaming mugs of black liquid, a plate of toast and two small bowls of jelly. Your roommate says, “I didn’t know your favorites, so I put out a cup of tea and a cup of coffee. I also put out peach jelly and orange marmalade for your toast.” After tasting everything, what decisions are you able to make about your breakfast?

A. You can easily distinguish coffee from tea and peach jelly from marmalade because taste buds have dedicated receptors that retain information about previously consumed foods.

B. You can easily distinguish sweet peach jelly from sweet-and-sour marmalade; distinguishing coffee from tea is more difficult, but you correctly choose coffee because it is more intensely bitter than tea.

C. You are unable to distinguish coffee from tea or peach jelly from marmalade without their odorants because taste buds only work in conjunction with odorants.

D. You can easily distinguish coffee from tea because they each activate unique taste buds, but you find it difficult to distinguish sweet peach jelly from sweet-and-sour marmalade because sweet and sour tastes are integrated by the same neurons in the brain

Draw a circulating IgG antibody and a TCR on the membrane of a T cell. Identify specifically the constant and variable Ig domains on each molecule, identify each of the protein chains, illustrate specifically where the antigen interaction takes place and for the circulating IgG, identify and name the region which is responsible for the antibody effector functions.

Explain the stages of mitosis and meiosis, justifying the behaviour of chromosomes at each stage.

Please answer this question 350 words

In addition to generating reducing power (i.e., NADPH) for biosynthesis, the pentose phosphate pathway also provides precursors for synthesis of which of the following? (Select all that apply.)

Choose one or more:A.fatty acidsB.aromatic amino acidsC.acetic acidD.nucleic acidsE.citric acid

Why is hyperthermia reached more quickly than hypothermia? Write at least six sentences.  

What is the difference between marijuana, dronabinol, and WIN52212-12 in terms of THC content, potency, and DEA schedule?

What are the phyletic characteristics
present in adult Homo sapiens?

I need to compare the Lac, Trp, Gal and Arabinose operons

list and define function of the five phyletic characteristics of the
Chordata. Then define larval and adult form in regard to the presence of four of the
phyletic characteristics in larva vs adult form of the Ascidacea. Define neoteny and the
evolutionary origin of the Vertebrata.

Define the phyletic characteristics of the Echinodermata. How are these bizarre
diagnostic characteristics developmentally related to the bilateral larval form of the
phylum? (Address the evolutionary advantage of this radial morphological organization in
the Crinoidea and the basic difference of how oral surface podia of the water
vascular system are used in the primitive Crinoidea vs more recent starfish of the
Asteroidea.)

Draw a color-coded diagram (to indicate the origin of each atom) for the de novo biosynthetic pathway of purine nucleotides AMP and GMP. You must provide structures and names of all the intermediates, cofactors involved, names of enzymes, and other necessary information for full credit