Your program will first prompt the user to enter a single dna sequence, which it should validate for legality (i. e., only the four valid bases) — you might do this validation by writing a function that takes a string as a parameter and returns a boolean. re-prompt the user if the input was invalid. once you have a valid input, compute the following statistics (each should be implemented as a separate function, called from

count the number of occurrences of "c".

determine the fraction of cytosine and guanine nucleotides. for example, if half of the nucleotides in the sequence are either "c" or "g", the fraction should be 0.5.

Ap practice - performance task response the ap create performance task asks you to write about an abstraction that you developed and wrote into your code. most of the time that means identifying a function or procedure you wrote to "manage complexity" in your program. here is the actual prompt from the create performance task: 2d. capture and paste a program code segment that contains an abstraction you developed individually on your own (marked with a rectangle). this abstraction must integrate mathematical and logical concepts. explain how your abstraction manage the complexity of your program. (must not exceed 200 words) below is a segment of code from an "under the sea" program with a rectangle drawn around a portion of the code identifying an abstraction. imagine that you wrote this and are composing an ap response about how this abstraction manages complexity. (note: ignore the requirement that the abstraction integrate "mathematical and logical concepts" for this practice response. just write about managing complexity). explain how the abstraction marked with the rectangle in the code above manage complexity of this program. write your response here submit

Kali, a python programmer, is using the turtle module to write the word “hello.” which code should she use to indicate the location to begin writing the word? a # pick up the turtle and move it to its starting location. b penup(-100, 200) goto() pendown() c penup() goto(-100, 200) pendown() d # pick up the turtle and move it to (-100, 200)

1. you have a small business that is divided into 3 departments: accounting, sales, and administration. these departments have the following number of devices (computers, printers, etc.): accounting-31, sales-28, and administration-13. using a class c private network, subnet the network so that each department will have their own subnet. you must show/explain how you arrived at your conclusion and also show the following: all available device addresses for each department, the broadcast address for each department, and the network address for each department. also, determine how many "wasted" (not usable) addresses resulted from your subnetting (enumerate them).